WO2020017222A1 - Tig welding torch - Google Patents

Tig welding torch Download PDF

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Publication number
WO2020017222A1
WO2020017222A1 PCT/JP2019/024197 JP2019024197W WO2020017222A1 WO 2020017222 A1 WO2020017222 A1 WO 2020017222A1 JP 2019024197 W JP2019024197 W JP 2019024197W WO 2020017222 A1 WO2020017222 A1 WO 2020017222A1
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WO
WIPO (PCT)
Prior art keywords
tig welding
tip
consumable electrode
cooling
torch
Prior art date
Application number
PCT/JP2019/024197
Other languages
French (fr)
Japanese (ja)
Inventor
勝則 和田
Original Assignee
大陽日酸株式会社
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Filing date
Publication date
Application filed by 大陽日酸株式会社 filed Critical 大陽日酸株式会社
Publication of WO2020017222A1 publication Critical patent/WO2020017222A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/24—Features related to electrodes
    • B23K9/28—Supporting devices for electrodes
    • B23K9/29—Supporting devices adapted for making use of shielding means

Definitions

  • the present invention relates to a torch for TIG welding.
  • GTAW Gas Tungsten Arc Arc welding
  • TIG welding Tungsten Inert Gas welding
  • plasma arc welding Electrode type gas shielded arc welding is used.
  • a TIG welding torch including a non-consumable electrode, a torch nozzle, and a torch body is used, and an arc is generated between the non-consumable electrode (-) and the workpiece (+) to generate an arc.
  • the welding is performed while the welded material is melted by the heat of the steel to form a molten pool (pool).
  • a shielding gas is released from a torch nozzle surrounding the periphery of the electrode, and the shielding gas blocks the atmosphere (air).
  • plasma arc welding uses a plasma arc torch including a non-consumable electrode, a water-cooled insert tip (also referred to as a constrained nozzle), a shield cap, and a torch body.
  • a plasma gas also referred to as a working gas
  • the plasma flow (plasma jet) generated at this time is narrowed by the insert tip, and the wall effect (effect of stabilizing the flow of the plasma flow) due to the inner wall shape of the insert tip, and the thermal pinch effect obtained by cooling the insert tip
  • a plasma arc with an increased energy density is generated by utilizing the effect of cooling the plasma flow from the surroundings and constricting it to a high temperature. Further, the plasma arc is further narrowed down by the thermal pinch effect of the shield gas released from the shield cap.
  • the plasma arc In plasma arc welding, welding is performed using a plasma arc having a high energy density and a narrowed arc shape as a heat source.
  • the plasma arc includes a transition type and a non-transition type.
  • the transition type plasma arc is a method in which a current flows between a non-consumable electrode (-) and a workpiece (+), and is applicable only to a conductive workpiece.
  • the non-transfer type plasma arc is a system in which a current flows between a non-consumable electrode (-) and an insert tip (+), and can be applied to a non-conductive workpiece.
  • the plasma arc is not limited to the above-described welding application, and is also used for, for example, brazing to a workpiece, joining, cutting, thermal spraying, a melting furnace, and the like.
  • a water-cooled cooling mechanism that cools the insert tip by circulating a coolant (water) is used to prevent the insert tip from being melted and damaged by the high-temperature plasma arc. ing.
  • the tip of the insert tip is not only exposed to the high temperature caused by the plasma arc, but is also a part that is heavily consumed by the influence of welding spatter and the like. In this case, it is necessary to replace not only the tip portion of the insert tip having a short life but also the tip itself, so that the cost of replacement increases.
  • a cooling mechanism is provided to cool a torch body and the like by circulating a cooling liquid (water).
  • the present invention has been proposed in view of such conventional circumstances, and has as its object to provide a TIG welding torch with improved cooling performance of non-consumable electrodes.
  • the present invention provides the following torch for TIG welding.
  • a non-consumable electrode that generates an arc between the workpiece and the workpiece;
  • a collet for supporting the non-consumable electrode while inserted inside, A collet body provided with a flow path through which a coolant is circulated, while holding the collet inside with the non-consumable electrode protruding from the tip side,
  • a torch nozzle that discharges a shielding gas toward a weld pool of the work piece generated by the arc
  • a TIG welding torch comprising: a cooling tip which is attached in a state of being thermally connected to the collet body and has a center hole for projecting the non-consumable electrode from a tip thereof.
  • FIG. 1 shows the configuration of a TIG torch according to a first embodiment of the present invention, where (a) is a cross-sectional view and (b) is a plan view as viewed from the tip side.
  • the structure of the TIG torch which is a 1st modification is shown, (a) is the sectional view, (b) is the top view seen from the tip side.
  • the structure of the TIG torch which is a 2nd modification is shown, (a) is the sectional view, (b) is the top view seen from the tip side.
  • the structure of the TIG torch which is a 3rd modification is shown, (a) is the sectional view, (b) is the top view seen from the front-end
  • FIG. 9 is an enlarged sectional perspective view of a main part of the torch for TIG welding shown in FIG. 8.
  • FIG. 1A is a cross-sectional view illustrating the configuration of the torch 1A for TIG welding.
  • FIG. 1B is a plan view of the TIG welding torch 1A as viewed from the distal end side.
  • the torch 1A for TIG welding includes a non-consumable electrode 2 for generating an arc with the workpiece S, a collet 3 for supporting the non-consumable electrode 2 inserted therein, and a non-consumable electrode 2
  • the collet body 5 is provided with a water jacket (flow path) 4 through which the cooling liquid W is circulated, and the periphery of the non-consumable electrode 2 is surrounded by holding the collet 3 inside while projecting from the front end side.
  • a torch nozzle 6 that is attached to the collet body 5 in a state and that emits a shielding gas toward a molten pool of the workpiece S generated by the arc, and is attached while being thermally connected to the collet body 5.
  • a cooling chip 7A provided with a center hole 7a for projecting the non-consumable electrode 2 from the tip.
  • the non-consumable electrode 2 is a long electrode rod formed of a metal material having a high melting point such as tungsten.
  • the non-consumable electrode 2 may be formed by adding an oxide such as thorium oxide, lanthanum oxide, cerium oxide, yttrium oxide, or zirconium oxide in addition to tungsten.
  • the collet 3 is a substantially cylindrical member formed using a metal material having excellent electrical conductivity and thermal conductivity such as copper or a copper alloy.
  • the collet 3 has a through hole 3a penetrating in the axial direction, and supports the non-consumable electrode 2 inserted inside the through hole 3a so as to be slidable in the axial direction.
  • a plurality of slits 3b are provided on the tip side of the collet 3 in a circumferential direction. The plurality of slits 3b are cut out linearly from the tip of the collet 3 to the middle part in the axial direction.
  • the distal end portion 3c between the slits 3b can be elastically deformed in the diameter reducing direction.
  • a tapered portion 3 d whose diameter is gradually reduced is provided at the tip of the collet 3.
  • the collet body 5 is a substantially cylindrical member formed using a material having excellent electrical and thermal conductivity such as copper or a copper alloy.
  • the collet body 5 has a through hole 5a penetrating in the axial direction, and holds the collet 3 inserted from the base end side of the through hole 5a inside.
  • the through hole 5a of the collet body 5 forms a flow path through which the first shield gas G1 flows.
  • a reduced diameter portion 5b with which the tapered portion 3d of the collet 3 is in contact.
  • the reduced diameter portion 5b is reduced in diameter to allow the non-consumable electrode 2 to penetrate.
  • only the non-consumable electrode 2 that has penetrated the through-hole 5a can be projected from the tip of the collet body 5.
  • a center nozzle 5c for discharging the first shield gas G1 supplied through the through hole 5a is provided at the tip end side of the collet body 5. Further, a gas supply port 5d for supplying the first shield gas G1 toward the through hole 5a is provided on a side surface of the collet body 5. On the other hand, a torch cap 8 for closing the rear end side of the through hole 5a is detachably attached to the rear end side of the collet body 5 by screwing.
  • the water jacket 4 is connected to a cooling mechanism (chiller) 50 that cools the collet body 5 by circulating a cooling liquid (water) W. As a result, the collet body 5 is cooled by the coolant (water) W flowing through the water jacket 4.
  • a cooling mechanism (chiller) 50 that cools the collet body 5 by circulating a cooling liquid (water) W.
  • the torch nozzle 6 has a substantially cylindrical nozzle shape using, for example, ceramics having excellent heat resistance.
  • the torch nozzle 6 forms a flow path through which the second shield gas G2 flows with the outer peripheral surface of the collet body 5 and is detachably attached to the outer peripheral surface of the collet body 5 by screwing.
  • the torch nozzle 6 may have a nozzle shape whose tip end side is gradually reduced in diameter.
  • the cooling chip 7A is formed in a substantially cylindrical shape, and is detachably attached to the collet body 5 by being screwed into the collet body 5 while being inserted into the collet body 5 from the tip end side of the collet body 5. Further, the cooling chip 7A has a tapered shape in which the tip side is narrowed.
  • the center hole 7a of the cooling chip 7A is in contact with the non-consumable electrode 2 and projects the non-consumable electrode 2 from its tip.
  • the cooling chip 7A has a gas discharge port 9 for discharging the first shield gas G1.
  • the gas discharge port 9 is composed of a plurality of holes 9a provided side by side around the center hole 7a.
  • the TIG welding torch 1A having the above configuration is connected to the power supply device 60.
  • the power supply device 60 is a DC and / or AC power supply device for TIG welding that has been generally used in the related art.
  • the power supply device 60 is connected to the TIG welding torch 1A via a welding cable (not shown), and is connected to the TIG welding torch 1A.
  • the electric power and the first and second shielding gases G1, G2 are supplied to the welding torch 1A.
  • the non-consumable electrode 2 is electrically connected to the minus (-) terminal side via a torch-side cable 61a, and the workpiece to be welded is connected to the plus (+) terminal side via a base material-side cable 61b. S is electrically connected.
  • an arc is generated between the non-consumable electrode 2 and the workpiece S, and welding is performed while melting the workpiece S by the heat of the arc to form a molten pool (pool).
  • the first and second shield gases G1, G2 are emitted from the torch nozzle 6 surrounding the non-consumable electrode 2, and the welding is performed while shielding the atmosphere (air) by the shield gases G1, G2.
  • the first and second shield gases G1 and G2 are not particularly limited.
  • an inert gas such as argon (Ar) or helium (He), or hydrogen (H 2 ), Helium (He), nitrogen (N 2 ) and the like.
  • a mixed gas in which a gas such as hydrogen (H 2 ) or nitrogen (N 2 ) is added to a mixed gas of argon (Ar) and helium (He) can be used.
  • the second shield gas G2 may be argon (Ar) or a mixture of argon (Ar) and helium (He), such as carbon dioxide (CO 2 ) or oxygen, in addition to the gas having the above-described composition.
  • a gas to which an oxidizing gas such as (O 2 ) is added may be used.
  • the above-described cooling tip 7A is attached while being thermally connected to the collet body 5.
  • the non-consumable electrode 2 is in contact with the cooling chip 7A with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7A.
  • FIG. 2A is a cross-sectional view illustrating the configuration of the torch 1B for TIG welding.
  • FIG. 2B is a plan view of the torch 1B for TIG welding as viewed from the front end side.
  • the same parts as those of the TIG welding torch 1A will not be described, and will be denoted by the same reference numerals in the drawings.
  • the TIG welding torch 1B of the present embodiment has basically the same configuration as the TIG welding torch 1A except that a cooling tip 7B is provided instead of the cooling tip 7A provided in the TIG welding torch 1A. I have.
  • the cooling tip 7B has a nozzle portion 7b which is cylindrically protruded from the tip thereof so as to surround a plurality of holes 9a (gas discharge ports 9). ing.
  • the first shield gas G1 discharged from the plurality of holes 9a (gas discharge ports 9) can be narrowed down by the nozzle 7b.
  • the above-described cooling tip 7B is attached in a state of being thermally connected to the collet body 5.
  • the non-consumable electrode 2 is in contact with the cooling chip 7B with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7B.
  • FIG. 3A is a cross-sectional view illustrating the configuration of the torch 1C for TIG welding.
  • FIG. 3B is a plan view of the TIG welding torch 1C as viewed from the front end side.
  • the same parts as those of the TIG welding torch 1A will not be described, and will be denoted by the same reference numerals in the drawings.
  • the TIG welding torch 1C of the present embodiment has basically the same configuration as the TIG welding torch 1A, except that the TIG welding torch 1C includes a cooling tip 7C instead of the cooling tip 7A included in the TIG welding torch 1A. I have.
  • the cooling tip 7C has a plurality of cutouts 9b as gas discharge ports 9 instead of the plurality of holes 9a provided in the cooling tip 7A.
  • the plurality of slits 9b are provided on the peripheral surface of the center hole 7a.
  • Each notch 9b is formed so as to cut out the peripheral surface of the center hole 7a in the axial direction.
  • the cutout portions 9b are provided at four positions, but the present invention is not limited to this.
  • the cutout 9b having a semicircular cross section is provided on the peripheral surface of the central hole 7a, but the cutout is not limited to the semicircular cross section.
  • the cooling chip 7C has a nozzle portion 7b which is cylindrically protruded from the tip thereof so as to surround the plurality of cutouts 9b (gas discharge ports 9).
  • the first shield gas G1 discharged from the plurality of cutouts 9b (gas discharge ports 9) can be narrowed down by the nozzle 7b.
  • the cooling tip 7C described above is attached in a state of being thermally connected to the collet body 5.
  • the non-consumable electrode 2 is in contact with the cooling chip 7C with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7C.
  • FIG. 4A is a cross-sectional view illustrating a configuration of the torch 1D for TIG welding.
  • FIG. 4B is a plan view of the TIG welding torch 1D as viewed from the distal end side.
  • the same parts as those of the TIG welding torch 1A will not be described, and will be denoted by the same reference numerals in the drawings.
  • the TIG welding torch 1D of the present embodiment has basically the same configuration as the TIG welding torch 1A except that a cooling tip 7D is provided instead of the cooling tip 7A provided in the TIG welding torch 1A. I have.
  • the cooling chip 7D has a plurality of cutouts 9c as the gas discharge ports 9 instead of the plurality of holes 9a provided in the cooling chip 7A.
  • the plurality of cutouts 9c are provided side by side around the center hole 7a.
  • each notch 9c is formed so as to cut out in the axial direction while dividing the distal end side of the cooling chip 7D in the circumferential direction. That is, the notch 9 c is provided in a cross shape around the non-consumable electrode 2.
  • the cutout portions 9c are provided at four positions, but the present invention is not limited to this.
  • the cooling tip 7D described above is attached in a state of being thermally connected to the collet body 5.
  • the non-consumable electrode 2 is in contact with the cooling chip 7D with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7D.
  • the collet body 5 and the non-consumable electrode 2 that are cooled by the circulation of the cooling liquid (water) W are thermally connected via the cooling tip 7D. ing.
  • the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed. Further, replacement of the cooling chip 7D is also easy.
  • FIG. 5A is a cross-sectional view illustrating the configuration of the torch 1E for TIG welding.
  • FIG. 5B is a plan view of the TIG welding torch 1E as viewed from the distal end side.
  • the same parts as those of the TIG welding torch 1A will not be described, and will be denoted by the same reference numerals in the drawings.
  • the TIG welding torch 1E of the present embodiment has basically the same configuration as the TIG welding torch 1A, except that the TIG welding torch 1E includes a cooling tip 7E instead of the cooling tip 7A included in the TIG welding torch 1A. I have.
  • the cooling tip 7E has a configuration in which the plurality of holes 9a (gas discharge ports 9) provided in the cooling tip 7A are omitted.
  • the TIG welding torch 1E of the present embodiment is configured to discharge only the second shield gas G2 from the torch nozzle 6.
  • the above-described cooling tip 7E is attached in a state of being thermally connected to the collet body 5.
  • the non-consumable electrode 2 is in contact with the cooling chip 7E with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7E.
  • FIG. 6 is a sectional view showing the configuration of the torch 1F for TIG welding.
  • the same parts as those of the TIG welding torch 1A will not be described, and will be denoted by the same reference numerals in the drawings.
  • the TIG welding torch 1F of the present embodiment has basically the same configuration as the TIG welding torch 1A, except that the TIG welding torch 1A includes a cooling tip 7F instead of the cooling tip 7A included in the TIG welding torch 1A. I have.
  • the cooling chip 7F has a configuration in which a plurality of holes 9a (gas discharge ports 9) provided in the cooling chip 7A are omitted.
  • the TIG welding torch 1F of the present embodiment is configured to discharge only the second shield gas G2 from the torch nozzle 6.
  • the cooling chip 7F, together with the collet body 5, constitutes a part of the water jacket 4. For this reason, the space between the collet body 5 and the cooling tip 7F constituting the water jacket 4 is liquid-tightly sealed by the O-ring 10. Thereby, the cooling chip 7F is cooled by the cooling liquid (water) W flowing through the water jacket 4 together with the collet body 5.
  • the cooling tip 7F described above is attached in a state of being thermally connected to the collet body 5, and the collet body 5 and the cooling tip 7F are circulated by the circulation of the cooling liquid (water) W. Cooling.
  • the non-consumable electrode 2 is in contact with the cooling chip 7F with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7F.
  • the cooling tip 7F cooled by the circulation of the cooling liquid (water) W and the non-consumable electrode 2 are in a state of being thermally connected.
  • the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed.
  • replacement of the cooling chip 7F is easy.
  • FIG. 7 is a sectional view showing the configuration of the torch 1G for TIG welding.
  • the same parts as those of the TIG welding torch 1A will not be described, and will be denoted by the same reference numerals in the drawings.
  • the TIG welding torch 1G of the present embodiment has basically the same configuration as the TIG welding torch 1A except that the TIG welding torch 1A includes a cooling tip 7G instead of the cooling tip 7A included in the TIG welding torch 1A. I have.
  • the cooling chip 7G has a configuration in which the plurality of holes 9a (gas discharge ports 9) provided in the cooling chip 7A are omitted.
  • the TIG welding torch 1G of the present embodiment is configured to discharge only the second shield gas G2 from the torch nozzle 6.
  • the central hole 7a of the cooling tip 7G is provided with a reduced diameter portion 7c which comes into contact with the pointed tip of the non-consumable electrode 2.
  • the reduced diameter portion 7c is reduced in diameter so as to penetrate the tip of the non-consumable electrode 2. This allows only the tip (tapered portion) of the non-consumable electrode 2 to penetrate through the center hole 7a from the tip of the cooling chip 7G.
  • the cooling tip 7G described above is attached in a state of being thermally connected to the collet body 5.
  • the non-consumable electrode 2 is in contact with the cooling chip 7G with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7G.
  • FIG. 8 is a sectional perspective view showing the configuration of the torch 1H for TIG welding.
  • FIG. 9 is an enlarged sectional perspective view of a main part of the torch 1H for TIG welding.
  • the same parts as those of the TIG welding torch 1A will not be described, and will be denoted by the same reference numerals in the drawings.
  • the TIG welding torch 1H of the present embodiment has a non-consumable electrode 2A that generates an arc between the TIG welding torch 1H and the workpiece S (not shown in FIGS. 8 and 9), and a state where the non-consumable electrode 2A is inserted inside.
  • a collet body 5A provided with a collet 3A supported by a collet and a water jacket (flow path) 4A through which the coolant W is circulated while the collet 3A is held inside with the non-consumable electrode 2A protruding from the front end side.
  • the torch nozzle 6A and the collet body 5A are attached in a thermally connected state, and the non-consumable electrode 2A projects from the tip thereof.
  • Central hole 7a is provided with schematically a cooling tip 7H provided.
  • the non-consumable electrode 2A has the same configuration as the non-consumable electrode 2, but in this embodiment, the non-consumable electrode 2A is longer than the non-consumable electrode 2.
  • the collet 3A has the same configuration as the above-mentioned collet 3 such as the through-hole 3a, the plurality of slits 3b, the tip portion 3c, and the tabber portion 3d. Long ones are used.
  • the collet body 5A has the same configuration as the collet body 5 such as a through hole 5a, a center nozzle 5c, and a gas supply port 5d (not shown in FIGS. 8 and 9). It is longer than that.
  • a torch cap 8A is detachably attached to the rear end side of the collet body 5A by screwing.
  • the torch cap 8A is provided with a gas supply port 8a for supplying the first shield gas G1 toward the through hole 5a.
  • the torch body 11 has an outer cylindrical member 12 formed in a substantially cylindrical shape using a steel material such as mild steel or stainless steel or brass, for example, and an insulating member 13 formed in a substantially cylindrical shape using an insulating resin. are doing.
  • the outer cylinder member 12 forms a power supply unit for supplying power to the non-consumable electrode 2A.
  • the non-consumable electrode 2A is disposed at the center of the through-hole 12a formed inside the outer cylindrical member 12, and the first shield extends from the periphery of the non-consumable electrode 2A toward the through-hole 5a of the collet body 5A.
  • a flow path for supplying the gas G1 is formed.
  • the collet body 5A is detachably attached to the outer cylinder member 12 by being screwed into the collet body 12 in a state of being inserted inside the through hole 12a. Further, the outer cylinder member 12 forms a flow path through which the second shield gas G2 flows between the outer cylinder member 12 and the outer peripheral surface of the collet body 5A.
  • the insulation member 13 covers the outer peripheral portion of the collet body 5A and is detachably attached to the outer cylinder member 12 by being screwed into the outer cylinder member 12 while being inserted inside the through hole 12a.
  • a water jacket (flow path) 14 through which a coolant (water) W is circulated is provided between the collet body 5A and the outer cylinder member 12.
  • the water jacket 14 includes a ring-shaped groove 12b that cuts the inner peripheral surface of the outer cylinder member 12 in the circumferential direction, and an outer peripheral surface of the collet body 5A.
  • the space between the collet body 5A and the outer cylinder member 12 constituting the water jacket 14 is liquid-tightly sealed by an O-ring 15.
  • the O-rings 15 are arranged on both sides of the water jacket 14 in the axial direction.
  • the water jackets 4A and 14 are connected to a cooling mechanism (chiller) 50 (not shown in FIGS. 8 and 9) for cooling the collet body 5A by circulating the cooling liquid (water) W. As a result, the collet body 5A is cooled by the coolant (water) W flowing through the water jackets 4A and 14.
  • a cooling mechanism chloriller 50 (not shown in FIGS. 8 and 9) for cooling the collet body 5A by circulating the cooling liquid (water) W.
  • the collet body 5A is cooled by the coolant (water) W flowing through the water jackets 4A and 14.
  • the torch nozzle 6A has a configuration similar to that of the torch nozzle 6, but in the present embodiment, a flow path through which the second shield gas G2 flows is formed between the torch nozzle 6A and the outer peripheral surface of the collet body 5A. It is detachably attached to the outer peripheral surface of the member 12 by screwing. Further, the torch nozzle 6A has a nozzle shape whose tip end side is gradually reduced in diameter.
  • the cooling chip 7H is formed in a substantially cylindrical shape, and is detachably attached to the collet body 5A by being screwed into the collet body 5A in a state where the cooling tip 7H is inserted inward from the front end side of the collet body 5A.
  • a flange portion 7d protruding in the diameter increasing direction is provided at the tip of the cooling chip 7H.
  • the cooling chip 7H is attached with the flange portion 7d in contact with the tip of the collet body 5A.
  • the cooling tip 7H is in contact with the collet 3A.
  • a reduced diameter portion 7e to which the tapered portion 3d of the collet 3A abuts is provided on the peripheral wall forming the center hole 7a.
  • the reduced diameter portion 7e is reduced in diameter so as to penetrate the non-consumable electrode 2A. This allows only the non-consumable electrode 2A that has penetrated the center hole 7a to protrude from the tip of the cooling chip 7H.
  • the cooling chip 7H forms a part of the water jacket 4A together with the collet body 5A. Therefore, the space between the collet body 5A and the cooling tip 7H constituting the water jacket 4A is liquid-tightly sealed by the O-ring 10A. Thus, the cooling chip 7H is cooled by the cooling liquid (water) W flowing through the water jacket 4A together with the collet body 5A.
  • the TIG welding torch 1H having the above configuration is connected to a power supply device 60 (not shown in FIGS. 8 and 9).
  • the power supply device 60 is connected to the TIG welding torch 1H via a welding cable (not shown) to supply power to the TIG welding torch 1H and the first and second shield gases G1, G2. .
  • the non-consumable electrode 2A is electrically connected to the minus (-) terminal side via a torch-side cable 61a, and the base material side cable 61b is connected to the plus (+) terminal side.
  • To be welded S is electrically connected via the.
  • an arc is generated between the non-consumable electrode 2A and the workpiece S, and welding is performed while melting the workpiece S by the heat of the arc to form a molten pool (pool).
  • the first and second shield gases G1, G2 are released from the torch nozzle 6A surrounding the periphery of the non-consumable electrode 2A, and welding is performed while shielding the atmosphere (air) by these shield gases G1, G2.
  • the cooling tip 7H described above is mounted in a state of being thermally connected to the collet body 5 and the collet 3A, and the cooling liquid (water) W is circulated to cool the collet body 5A and the cooling.
  • the chip 7H is being cooled.
  • the cooling tip 7H cooled by the circulation of the cooling liquid (water) W and the collet 3A are in a state of being thermally connected.
  • the cooling effect of the non-consumable electrode 2A thermally connected to the collet 3A can be improved, and it is possible to suppress the non-consumable electrode 2A from being consumed by the arc heat.
  • replacement of the cooling chip 7H is easy.
  • the cooling chips 7A to 7D and 7G constitute a part of the water jacket 4 together with the collet body 5, similarly to the cooling chip 7F, and are cooled by a cooling liquid (water) W flowing through the water jacket 4. It is also possible to adopt a configuration in which
  • the tips of the non-consumable electrodes 2 and 2A protrude outside the tips of the cooling tips 7A to 7H.
  • the cooling chips 7A to 7H can be used as a plasma arc torch by being pulled inward from the tips. Further, by changing the constraining tip provided at the tip of the conventional plasma arc torch to the cooling tips 7A to 7H of the present invention, it is possible to convert the plasma arc torch to a TIG welding torch.

Abstract

An object of the present invention is to provide a TIG welding torch with improved cooling performance of a non-consumable electrode, and the present invention provides a TIG welding torch comprising: a non-consumable electrode (2) for generating an arc with a workpiece (S) to be welded; a collet (3) that supports the non-consumable electrode (2) in a state of being inserted therein; a collet body (5) that holds the collet (3) in a state where the non-consumable electrode (2) is projected to the distal end side thereof and that is provided with a flow path (4) through which a cooling liquid W is circulated; a torch nozzle (6) that discharges a shielding gas (G2) toward a weld pool, which is generated by the arc, of the workpiece (S) to be welded, while surrounding the non-consumable electrode (2) with the gas; and a cooling tip (7A) that is attached in a state of being thermally connected to the collet body (5) and that is provided with a central hole (7a) through which the non-consumable electrode (2) is projected from the distal end of the cooling tip.

Description

ＴＩＧ溶接用トーチTIG welding torch
　本発明は、ＴＩＧ溶接用トーチに関する。 The present invention relates to a torch for TIG welding.
　金属や非鉄金属などを母材として用いた構造物（被溶接物）の溶接には、従来よりＴＩＧ溶接（Tungsten Inert Gas welding）又はプラズマアーク溶接等のＧＴＡＷ（Gas Tungsten Arc welding）と呼ばれる非消耗電極式のガスシールドアーク溶接が用いられている。 Conventionally, welding of a structure (weld) using a metal or a non-ferrous metal as a base material is a non-consumable called GTAW (Gas Tungsten Arc Arc welding) such as TIG welding (Tungsten Inert Gas welding) or plasma arc welding. Electrode type gas shielded arc welding is used.
　ＴＩＧ溶接では、非消耗電極と、トーチノズルと、トーチボディとを備えるＴＩＧ溶接用トーチを使用し、非消耗電極（－）と被溶接物（＋）との間でアークを発生させて、このアークの熱により被溶接物を溶かして溶融池（プール）を形成しながら溶接が行われる。また、溶接中は電極の周囲を囲むトーチノズルからシールドガスを放出し、このシールドガスで大気（空気）を遮断する。 In TIG welding, a TIG welding torch including a non-consumable electrode, a torch nozzle, and a torch body is used, and an arc is generated between the non-consumable electrode (-) and the workpiece (+) to generate an arc. The welding is performed while the welded material is melted by the heat of the steel to form a molten pool (pool). During welding, a shielding gas is released from a torch nozzle surrounding the periphery of the electrode, and the shielding gas blocks the atmosphere (air).
　これに対して、プラズマアーク溶接では、非消耗電極と、水冷のインサートチップ（拘束ノズルとも言う。）と、シールドキャップと、トーチボディとを備えるプラズマアーク用トーチを使用し、非消耗電極とインサートチップとの間で電気的にプラズマ化されたプラズマガス（作動ガスとも言う。）を流す。このとき発生するプラズマ流（プラズマジェット）をインサートチップで絞り込み、インサートチップの内壁形状によるウォール効果（プラズマ流の気流の流れを安定させる効果）や、インサートチップを冷却することで得られるサーマルピンチ効果（プラズマ流を周囲から冷却することで緊縮し高温となる効果）を利用して、エネルギー密度が高められたプラズマアークを発生させる。また、プラズマアークは、シールドキャップから放出されるシールドガスによるサーマルピンチ効果を受けて更に絞り込まれる。 In contrast, plasma arc welding uses a plasma arc torch including a non-consumable electrode, a water-cooled insert tip (also referred to as a constrained nozzle), a shield cap, and a torch body. A plasma gas (also referred to as a working gas), which is electrically turned into plasma, flows between the chip and the chip. The plasma flow (plasma jet) generated at this time is narrowed by the insert tip, and the wall effect (effect of stabilizing the flow of the plasma flow) due to the inner wall shape of the insert tip, and the thermal pinch effect obtained by cooling the insert tip A plasma arc with an increased energy density is generated by utilizing the effect of cooling the plasma flow from the surroundings and constricting it to a high temperature. Further, the plasma arc is further narrowed down by the thermal pinch effect of the shield gas released from the shield cap.
　プラズマアーク溶接では、このようにエネルギー密度が高く、アーク形状が円柱状に絞り込まれたプラズマアークを熱源として溶接が行われる。また、プラズマアークには、移行型と非移行型とがある。移行型のプラズマアークは、非消耗電極（－）と被加工物（＋）との間で電流を流す方式であり、導電性の被加工物に対してのみ適用が可能である。一方、非移行型のプラズマアークは、非消耗電極（－）とインサートチップ（＋）との間で電流を流す方式であり、非導電性の被加工物に対しても適用が可能である。さらに、プラズマアークは、上述した溶接の用途に限らず、例えば、被加工物に対するロウ付けや、接合、切断、溶射、溶融炉などにも利用されている。 In plasma arc welding, welding is performed using a plasma arc having a high energy density and a narrowed arc shape as a heat source. The plasma arc includes a transition type and a non-transition type. The transition type plasma arc is a method in which a current flows between a non-consumable electrode (-) and a workpiece (+), and is applicable only to a conductive workpiece. On the other hand, the non-transfer type plasma arc is a system in which a current flows between a non-consumable electrode (-) and an insert tip (+), and can be applied to a non-conductive workpiece. Further, the plasma arc is not limited to the above-described welding application, and is also used for, for example, brazing to a workpiece, joining, cutting, thermal spraying, a melting furnace, and the like.
　ところで、上述したプラズマアーク用トーチでは、高温のプラズマアークによるインサートチップの溶損を防止するために、冷却液（水）の循環によりインサートチップを冷却する水冷式の冷却機構（チラー）が用いられている。 By the way, in the torch for plasma arc described above, a water-cooled cooling mechanism (chiller) that cools the insert tip by circulating a coolant (water) is used to prevent the insert tip from being melted and damaged by the high-temperature plasma arc. ing.
　しかしながら、チラーの故障などでインサートチップが冷却されない場合には、インサートチップの損傷に留まらず、トーチボディが溶損することになる。この場合、修理などのコストが上昇することになる。 However, if the insert tip is not cooled due to a failure of the chiller or the like, not only the insert tip is damaged but also the torch body is damaged by melting. In this case, repair and other costs will increase.
　また、インサートチップの先端部は、プラズマアークによる高温に晒されるだけでなく、溶接スパッタの付着等の影響によって、消耗が激しい部分である。この場合、寿命の短いインサートチップの先端部分のみならず、チップ自体を交換する必要があるため、交換によるコストも上昇することになる。 先端 The tip of the insert tip is not only exposed to the high temperature caused by the plasma arc, but is also a part that is heavily consumed by the influence of welding spatter and the like. In this case, it is necessary to replace not only the tip portion of the insert tip having a short life but also the tip itself, so that the cost of replacement increases.
　そこで、本願出願人は、インサートチップの先端部に着脱自在に取り付けられるチップを設けることによって、チップの取付強度及び交換のし易さを確保しつつ、インサートチップの冷却性能の向上を可能としたプラズマアーク用トーチを提案している（下記特許文献１を参照。）。 Therefore, the applicant of the present application has made it possible to improve the cooling performance of the insert tip while securing the attachment strength and the ease of replacement of the insert tip by providing a detachably attached tip at the tip of the insert tip. A torch for a plasma arc has been proposed (see Patent Document 1 below).
　また、ＴＩＧ溶接用トーチでも、冷却機構を設けて、冷却液（水）の循環によりトーチボディ等を冷却することが行われている。 で も Also, in the torch for TIG welding, a cooling mechanism is provided to cool a torch body and the like by circulating a cooling liquid (water).
　一方、ＴＩＧ溶接用トーチでは、非消耗電極のアーク熱による消耗を抑制するために、この非消耗電極を冷却する必要がある。また、非消耗電極の冷却効果を上げるためには、この非消耗電極の先端と、冷却液（水）が循環される流路との距離をできるだけ短くする必要がある。 On the other hand, in the torch for TIG welding, it is necessary to cool the non-consumable electrode in order to suppress the consumption of the non-consumable electrode due to arc heat. Further, in order to enhance the cooling effect of the non-consumable electrode, it is necessary to minimize the distance between the tip of the non-consumable electrode and the flow path through which the coolant (water) is circulated.
特開２０１７－１１９２９７号公報JP-A-2017-119297
　本発明は、このような従来の事情に鑑みて提案されたものであり、非消耗電極の冷却性能を向上させたＴＩＧ溶接用トーチを提供することを目的とする。 The present invention has been proposed in view of such conventional circumstances, and has as its object to provide a TIG welding torch with improved cooling performance of non-consumable electrodes.
　上記目的を達成するために、本発明は以下のＴＩＧ溶接用トーチを提供する。
〔１〕　被溶接物との間でアークを発生させる非消耗電極と、
　前記非消耗電極を内側に挿入した状態で支持するコレットと、
　前記非消耗電極を先端側から突出させた状態で前記コレットを内側に保持すると共に、冷却液が循環される流路が設けられたコレットボディと、
　前記非消耗電極の周囲を囲んだ状態で、アークによって生じた被溶接物の溶融池に向かってシールドガスを放出するトーチノズルと、
　前記コレットボディと熱的に接続された状態で取り付けられると共に、その先端から前記非消耗電極を突出させる中心孔が設けられた冷却チップとを備えるＴＩＧ溶接用トーチ。
〔２〕　前記冷却チップは、前記非消耗電極と接触していることを特徴とする前記〔１〕に記載のＴＩＧ溶接用トーチ。
〔３〕　前記冷却チップは、シールドガスを放出するガス放出口を有することを特徴とする前記〔２〕に記載のＴＩＧ溶接用トーチ。
〔４〕　前記ガス放出口は、前記中心孔の周囲に並んで設けられた複数の孔部により構成されていることを特徴とする前記〔３〕に記載のＴＩＧ溶接用トーチ。
〔５〕　前記ガス放出口は、前記中心孔の周囲に並んで設けられた複数の切欠部により構成されていることを特徴とする前記〔３〕に記載のＴＩＧ溶接用トーチ。
〔６〕　前記冷却チップは、その先端から前記ガス放出口の周囲を囲むように突出されたノズル部を有することを特徴とする前記〔３〕～〔５〕の何れかに記載のＴＩＧ溶接用トーチ。
〔７〕　前記冷却チップは、前記コレットと接触していることを特徴とする前記〔１〕に記載のＴＩＧ溶接用トーチ。
〔８〕　前記冷却チップは、前記コレットボディと共に、前記流路の一部を構成していることを特徴とする前記〔７〕に記載のＴＩＧ溶接用トーチ。
〔９〕　前記冷却チップは、前記コレットボディの先端側から内側に挿入された状態で、前記コレットボディに対して着脱自在に取り付けられていることを特徴とする前記〔８〕に記載のＴＩＧ溶接用トーチ。 In order to achieve the above object, the present invention provides the following torch for TIG welding.
[1] a non-consumable electrode that generates an arc between the workpiece and the workpiece;
A collet for supporting the non-consumable electrode while inserted inside,
A collet body provided with a flow path through which a coolant is circulated, while holding the collet inside with the non-consumable electrode protruding from the tip side,
In a state surrounding the non-consumable electrode, a torch nozzle that discharges a shielding gas toward a weld pool of the work piece generated by the arc,
A TIG welding torch, comprising: a cooling tip which is attached in a state of being thermally connected to the collet body and has a center hole for projecting the non-consumable electrode from a tip thereof.
[2] The TIG welding torch according to [1], wherein the cooling tip is in contact with the non-consumable electrode.
[3] The TIG welding torch according to [2], wherein the cooling tip has a gas discharge port for discharging a shielding gas.
[4] The torch for TIG welding according to [3], wherein the gas discharge port is constituted by a plurality of holes provided side by side around the center hole.
[5] The torch for TIG welding according to [3], wherein the gas outlet is constituted by a plurality of cutouts provided side by side around the center hole.
[6] The TIG welding device according to any one of [3] to [5], wherein the cooling tip has a nozzle portion protruding from a tip end thereof so as to surround a periphery of the gas discharge port. torch.
[7] The torch for TIG welding according to [1], wherein the cooling tip is in contact with the collet.
[8] The torch for TIG welding according to [7], wherein the cooling tip forms a part of the flow path together with the collet body.
[9] The TIG welding according to [8], wherein the cooling tip is detachably attached to the collet body in a state where the cooling tip is inserted inside from a tip end side of the collet body. For torch.
　以上のように、本発明によれば、非消耗電極の冷却性能を向上させたＴＩＧ溶接用トーチを提供することが可能である。 As described above, according to the present invention, it is possible to provide a TIG welding torch with improved cooling performance of non-consumable electrodes.
本発明の第１の実施形態に係るＴＩＧ用トーチの構成を示し、（ａ）はその断面図、（ｂ）はその先端側から見た平面図である。1 shows the configuration of a TIG torch according to a first embodiment of the present invention, where (a) is a cross-sectional view and (b) is a plan view as viewed from the tip side. 第１の変型例であるＴＩＧ用トーチの構成を示し、（ａ）はその断面図、（ｂ）はその先端側から見た平面図である。The structure of the TIG torch which is a 1st modification is shown, (a) is the sectional view, (b) is the top view seen from the tip side. 第２の変型例であるＴＩＧ用トーチの構成を示し、（ａ）はその断面図、（ｂ）はその先端側から見た平面図である。The structure of the TIG torch which is a 2nd modification is shown, (a) is the sectional view, (b) is the top view seen from the tip side. 第３の変型例であるＴＩＧ用トーチの構成を示し、（ａ）はその断面図、（ｂ）はその先端側から見た平面図である。The structure of the TIG torch which is a 3rd modification is shown, (a) is the sectional view, (b) is the top view seen from the front-end | tip side. 第４の変型例であるＴＩＧ用トーチの構成を示し、（ａ）はその断面図、（ｂ）はその先端側から見た平面図である。The structure of the TIG torch which is a 4th modification is shown, (a) is the sectional view, (b) is the top view seen from the tip side. 第５の変型例であるＴＩＧ用トーチの構成を示す断面図である。It is sectional drawing which shows the structure of the torch for TIG which is a 5th modification. 第６の変型例であるＴＩＧ用トーチの構成を示す断面図である。It is sectional drawing which shows the structure of the torch for TIG which is a 6th modification. 本発明の第２の実施形態に係るＴＩＧ溶接用トーチの構成を示す断面斜視図である。It is a sectional perspective view showing the composition of the torch for TIG welding concerning a 2nd embodiment of the present invention. 図８に示すＴＩＧ溶接用トーチの要部を拡大した断面斜視図である。FIG. 9 is an enlarged sectional perspective view of a main part of the torch for TIG welding shown in FIG. 8.
　以下、本発明の実施形態について、図面を参照して詳細に説明する。
　なお、以下の説明で用いる図面においては、各構成要素を見やすくするため、構成要素によって寸法の縮尺を異ならせて示すことがあり、各構成要素の寸法比率などが実際と同じであるとは限らないものとする。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the drawings used in the following description, in order to make each component easy to see, the scale of the dimensions may be different depending on the component, and the dimensional ratios of the components are not necessarily the same as the actual size. Make it not exist.
（第１の実施形態）
　先ず、本発明の第１の実施形態として、例えば図１（ａ）および（ｂ）に示すＴＩＧ溶接用トーチ１Ａについて説明する。なお、図１（ａ）は、ＴＩＧ溶接用トーチ１Ａの構成を示す断面図である。図１（ｂ）は、ＴＩＧ溶接用トーチ１Ａを先端側から見た平面図である。 (First embodiment)
First, a TIG welding torch 1A shown in FIGS. 1A and 1B will be described as a first embodiment of the present invention. FIG. 1A is a cross-sectional view illustrating the configuration of the torch 1A for TIG welding. FIG. 1B is a plan view of the TIG welding torch 1A as viewed from the distal end side.
　本実施形態のＴＩＧ溶接用トーチ１Ａは、被溶接物Ｓとの間でアークを発生させる非消耗電極２と、非消耗電極２を内側に挿入した状態で支持するコレット３と、非消耗電極２を先端側から突出させた状態でコレット３を内側に保持すると共に、冷却液Ｗが循環されるウォータージャケット（流路）４が設けられたコレットボディ５と、非消耗電極２の周囲を囲んだ状態でコレットボディ５に取り付けられると共に、アークによって生じた被溶接物Ｓの溶融池に向かってシールドガスを放出するトーチノズル６と、コレットボディ５と熱的に接続された状態で取り付けられると共に、その先端から非消耗電極２を突出させる中心孔７ａが設けられた冷却チップ７Ａとを概略備えている。 The torch 1A for TIG welding according to the present embodiment includes a non-consumable electrode 2 for generating an arc with the workpiece S, a collet 3 for supporting the non-consumable electrode 2 inserted therein, and a non-consumable electrode 2 The collet body 5 is provided with a water jacket (flow path) 4 through which the cooling liquid W is circulated, and the periphery of the non-consumable electrode 2 is surrounded by holding the collet 3 inside while projecting from the front end side. A torch nozzle 6 that is attached to the collet body 5 in a state and that emits a shielding gas toward a molten pool of the workpiece S generated by the arc, and is attached while being thermally connected to the collet body 5. And a cooling chip 7A provided with a center hole 7a for projecting the non-consumable electrode 2 from the tip.
　非消耗電極２は、例えばタングステンなどの融点の高い金属材料を用いて形成された長尺状の電極棒からなる。また、非消耗電極２には、タングステンの他に、例えば酸化トリウムや酸化ランタン、酸化セリウム、酸化イットリウム、酸化ジルコニウムなどの酸化物を添加したものを用いることができる。 The non-consumable electrode 2 is a long electrode rod formed of a metal material having a high melting point such as tungsten. The non-consumable electrode 2 may be formed by adding an oxide such as thorium oxide, lanthanum oxide, cerium oxide, yttrium oxide, or zirconium oxide in addition to tungsten.
　コレット３は、例えば銅又は銅合金などの電気伝導性及び熱伝導性に優れた金属材料を用いて形成された概略円筒状の部材からなる。コレット３は、軸線方向に貫通する貫通孔３ａを有し、この貫通孔３ａの内側に挿入された非消耗電極２を軸線方向にスライド可能に支持する。コレット３の先端側には、複数のスリット３ｂが周方向に並んで設けられている。複数のスリット３ｂは、コレット３の先端から軸線方向の中途部に亘って直線状に切り欠かれている。これにより、各スリット３ｂの間の先端部分３ｃが縮径方向に弾性変形可能となっている。また、コレット３の先端部には、漸次縮径されたテーパー部３ｄが設けられている。 The collet 3 is a substantially cylindrical member formed using a metal material having excellent electrical conductivity and thermal conductivity such as copper or a copper alloy. The collet 3 has a through hole 3a penetrating in the axial direction, and supports the non-consumable electrode 2 inserted inside the through hole 3a so as to be slidable in the axial direction. A plurality of slits 3b are provided on the tip side of the collet 3 in a circumferential direction. The plurality of slits 3b are cut out linearly from the tip of the collet 3 to the middle part in the axial direction. Thus, the distal end portion 3c between the slits 3b can be elastically deformed in the diameter reducing direction. In addition, a tapered portion 3 d whose diameter is gradually reduced is provided at the tip of the collet 3.
　コレットボディ５は、例えば銅又は銅合金などの電気伝導性及び熱伝導性に優れた材料を用いて形成された概略円筒状の部材からなる。コレットボディ５は、軸線方向に貫通する貫通孔５ａを有し、この貫通孔５ａの基端側から挿入されたコレット３を内側に保持する。 The collet body 5 is a substantially cylindrical member formed using a material having excellent electrical and thermal conductivity such as copper or a copper alloy. The collet body 5 has a through hole 5a penetrating in the axial direction, and holds the collet 3 inserted from the base end side of the through hole 5a inside.
　また、コレットボディ５の貫通孔５ａは、第１のシールドガスＧ１が流れる流路を形成している。貫通孔５ａの内側には、コレット３のテーパー部３ｄが当接される縮径部５ｂが設けられている。縮径部５ｂは、非消耗電極２を貫通させる程度に縮径されている。これにより、コレットボディ５の先端部からは、貫通孔５ａを貫通した非消耗電極２のみを突出させることが可能となっている。 {Circle around (5)} The through hole 5a of the collet body 5 forms a flow path through which the first shield gas G1 flows. Inside the through hole 5a, there is provided a reduced diameter portion 5b with which the tapered portion 3d of the collet 3 is in contact. The reduced diameter portion 5b is reduced in diameter to allow the non-consumable electrode 2 to penetrate. Thus, only the non-consumable electrode 2 that has penetrated the through-hole 5a can be projected from the tip of the collet body 5.
　コレットボディ５の先端側には、貫通孔５ａを介して供給された第１のシールドガスＧ１を放出するセンターノズル５ｃが設けられている。また、コレットボディ５の側面には、貫通孔５ａに向けて第１のシールドガスＧ１を供給するガス供給口５ｄが設けられている。一方、コレットボディ５の後端側には、貫通孔５ａの後端側を閉塞するトーチキャップ８が螺合により着脱自在に取り付けられている。 セ ン タ ー A center nozzle 5c for discharging the first shield gas G1 supplied through the through hole 5a is provided at the tip end side of the collet body 5. Further, a gas supply port 5d for supplying the first shield gas G1 toward the through hole 5a is provided on a side surface of the collet body 5. On the other hand, a torch cap 8 for closing the rear end side of the through hole 5a is detachably attached to the rear end side of the collet body 5 by screwing.
　ウォータージャケット４は、冷却液（水）Ｗの循環によりコレットボディ５を冷却する冷却機構（チラー）５０と接続されている。これにより、コレットボディ５は、ウォータージャケット４を流れる冷却液（水）Ｗにより冷却されることになる。 The water jacket 4 is connected to a cooling mechanism (chiller) 50 that cools the collet body 5 by circulating a cooling liquid (water) W. As a result, the collet body 5 is cooled by the coolant (water) W flowing through the water jacket 4.
　トーチノズル６は、例えば耐熱性に優れたセラミックなどを用いて概略円筒状に形成されたノズル形状を有している。トーチノズル６は、コレットボディ５の外周面との間で第２のシールドガスＧ２が流れる流路を形成すると共に、コレットボディ５の外周面に螺合により着脱自在に取り付けられている。なお、トーチノズル６は、その先端側が漸次縮径されたノズル形状であってもよい。 The torch nozzle 6 has a substantially cylindrical nozzle shape using, for example, ceramics having excellent heat resistance. The torch nozzle 6 forms a flow path through which the second shield gas G2 flows with the outer peripheral surface of the collet body 5 and is detachably attached to the outer peripheral surface of the collet body 5 by screwing. Note that the torch nozzle 6 may have a nozzle shape whose tip end side is gradually reduced in diameter.
　冷却チップ７Ａは、概略円筒状に形成されて、コレットボディ５の先端側からコレットボディ５の内側に挿入された状態で、コレットボディ５に対して螺合により着脱自在に取り付けられている。また、冷却チップ７Ａは、その先端側が絞り込まれたテーパー形状を有している。 The cooling chip 7A is formed in a substantially cylindrical shape, and is detachably attached to the collet body 5 by being screwed into the collet body 5 while being inserted into the collet body 5 from the tip end side of the collet body 5. Further, the cooling chip 7A has a tapered shape in which the tip side is narrowed.
　冷却チップ７Ａの中心孔７ａは、非消耗電極２と接触した状態で、その先端から非消耗電極２を突出させている。また、冷却チップ７Ａは、第１のシールドガスＧ１を放出するガス放出口９を有している。ガス放出口９は、中心孔７ａの周囲に並んで設けられた複数の孔部９ａにより構成されている。 中心 The center hole 7a of the cooling chip 7A is in contact with the non-consumable electrode 2 and projects the non-consumable electrode 2 from its tip. The cooling chip 7A has a gas discharge port 9 for discharging the first shield gas G1. The gas discharge port 9 is composed of a plurality of holes 9a provided side by side around the center hole 7a.
　以上のような構成を有するＴＩＧ溶接用トーチ１Ａは、電源装置６０と接続されている。電源装置６０は、従来より一般に使用されている直流式及び／又は交流式のＴＩＧ溶接用電源装置であり、ＴＩＧ溶接用トーチ１Ａと溶接ケーブル（図示せず。）を介して接続されて、ＴＩＧ溶接用トーチ１Ａへの電力並びに第１及び第２のシールドガスＧ１、Ｇ２の供給を行う。 Ｔ The TIG welding torch 1A having the above configuration is connected to the power supply device 60. The power supply device 60 is a DC and / or AC power supply device for TIG welding that has been generally used in the related art. The power supply device 60 is connected to the TIG welding torch 1A via a welding cable (not shown), and is connected to the TIG welding torch 1A. The electric power and the first and second shielding gases G1, G2 are supplied to the welding torch 1A.
　電源装置６０では、マイナス(－)端子側にトーチ側ケーブル６１ａを介して非消耗電極２が電気的に接続され、且つ、プラス(＋)端子側に母材側ケーブル６１ｂを介して被溶接物Ｓが電気的に接続されている。 In the power supply device 60, the non-consumable electrode 2 is electrically connected to the minus (-) terminal side via a torch-side cable 61a, and the workpiece to be welded is connected to the plus (+) terminal side via a base material-side cable 61b. S is electrically connected.
　これにより、非消耗電極２と被溶接物Ｓとの間でアークを発生させて、このアークの熱により被溶接物Ｓを溶かして溶融池（プール）を形成しながら溶接が行われる。また、溶接中は非消耗電極２の周囲を囲むトーチノズル６から第１及び第２のシールドガスＧ１、Ｇ２を放出し、これらのシールドガスＧ１、Ｇ２により大気（空気）を遮断しながら溶接が行われる。 Thus, an arc is generated between the non-consumable electrode 2 and the workpiece S, and welding is performed while melting the workpiece S by the heat of the arc to form a molten pool (pool). During welding, the first and second shield gases G1, G2 are emitted from the torch nozzle 6 surrounding the non-consumable electrode 2, and the welding is performed while shielding the atmosphere (air) by the shield gases G1, G2. Will be
　なお、第１及び第２のシールドガスＧ１、Ｇ２については、特に限定されるものではなく、例えばアルゴン（Ａｒ）やヘリウム（Ｈｅ）等の不活性ガスや、アルゴン（Ａｒ）に水素（Ｈ２）、ヘリウム（Ｈｅ）、窒素（Ｎ２）等のガスを添加した混合ガスを用いることができる。また、アルゴン（Ａｒ）とヘリウム（Ｈｅ）との混合ガスに水素（Ｈ２）、窒素（Ｎ２）等のガスを添加した混合ガスを用いることができる。また、第２ののシールドガスＧ２については、上述した組成のガスの他に、アルゴン（Ａｒ）又はアルゴン（Ａｒ）とヘリウム（Ｈｅ）との混合ガスに、例えば炭酸ガス（ＣＯ２）や酸素（Ｏ２）等の酸化性ガスを添加したものを用いてもよい。 The first and second shield gases G1 and G2 are not particularly limited. For example, an inert gas such as argon (Ar) or helium (He), or hydrogen (H 2 ), Helium (He), nitrogen (N 2 ) and the like. Alternatively, a mixed gas in which a gas such as hydrogen (H 2 ) or nitrogen (N 2 ) is added to a mixed gas of argon (Ar) and helium (He) can be used. The second shield gas G2 may be argon (Ar) or a mixture of argon (Ar) and helium (He), such as carbon dioxide (CO 2 ) or oxygen, in addition to the gas having the above-described composition. A gas to which an oxidizing gas such as (O 2 ) is added may be used.
　本実施形態のＴＩＧ溶接用トーチ１Ａでは、上述した冷却チップ７Ａがコレットボディ５と熱的に接続された状態で取り付けられている。また、冷却チップ７Ａの中心孔７ａから非消耗電極２の先端を突出させた状態で、この非消耗電極２が冷却チップ７Ａと接触している。 で は In the TIG welding torch 1A of the present embodiment, the above-described cooling tip 7A is attached while being thermally connected to the collet body 5. The non-consumable electrode 2 is in contact with the cooling chip 7A with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7A.
　すなわち、本実施形態のＴＩＧ溶接用トーチ１Ａでは、冷却チップ７Ａを介して、冷却液（水）Ｗの循環により冷却されるコレットボディ５と非消耗電極２とが熱的に接続された状態となっている。これにより、非消耗電極２の冷却効果を上げることができ、この非消耗電極２のアーク熱による消耗を抑制することが可能である。また、冷却チップ７Ａの交換も容易である。 That is, in the TIG welding torch 1A of the present embodiment, the state where the collet body 5 and the non-consumable electrode 2 that are cooled by the circulation of the cooling liquid (water) W are thermally connected via the cooling tip 7A. Has become. Thereby, the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed. In addition, replacement of the cooling chip 7A is easy.
（第１の変型例）
　次に、本発明の第１の変形例として、例えば図２（ａ）および（ｂ）に示すＴＩＧ溶接用トーチ１Ｂについて説明する。
　なお、図２（ａ）は、ＴＩＧ溶接用トーチ１Ｂの構成を示す断面図である。図２（ｂ）は、ＴＩＧ溶接用トーチ１Ｂを先端側から見た平面図である。また、以下の説明では、上記ＴＩＧ溶接用トーチ１Ａと同等の部位については、説明を省略すると共に、図面において同じ符号を付すものとする。 (First variant)
Next, as a first modified example of the present invention, for example, a TIG welding torch 1B shown in FIGS. 2A and 2B will be described.
FIG. 2A is a cross-sectional view illustrating the configuration of the torch 1B for TIG welding. FIG. 2B is a plan view of the torch 1B for TIG welding as viewed from the front end side. In the following description, the same parts as those of the TIG welding torch 1A will not be described, and will be denoted by the same reference numerals in the drawings.
　本実施形態のＴＩＧ溶接用トーチ１Ｂは、上記ＴＩＧ溶接用トーチ１Ａが備える冷却チップ７Ａの代わりに、冷却チップ７Ｂを備える以外は、上記ＴＩＧ溶接用トーチ１Ａと基本的に同じ構成を有している。 The TIG welding torch 1B of the present embodiment has basically the same configuration as the TIG welding torch 1A except that a cooling tip 7B is provided instead of the cooling tip 7A provided in the TIG welding torch 1A. I have.
　具体的には、このＴＩＧ溶接用トーチ１Ｂにおいて、冷却チップ７Ｂは、その先端から複数の孔部９ａ（ガス放出口９）の周囲を囲むように円筒状に突出されたノズル部７ｂを有している。この構成の場合、複数の孔部９ａ（ガス放出口９）から放出された第１のシールドガスＧ１をノズル部７ｂにより絞り込むことができる。 More specifically, in this TIG welding torch 1B, the cooling tip 7B has a nozzle portion 7b which is cylindrically protruded from the tip thereof so as to surround a plurality of holes 9a (gas discharge ports 9). ing. In the case of this configuration, the first shield gas G1 discharged from the plurality of holes 9a (gas discharge ports 9) can be narrowed down by the nozzle 7b.
　本実施形態のＴＩＧ溶接用トーチ１Ｂでは、上述した冷却チップ７Ｂがコレットボディ５と熱的に接続された状態で取り付けられている。また、冷却チップ７Ｂの中心孔７ａから非消耗電極２の先端を突出させた状態で、この非消耗電極２が冷却チップ７Ｂと接触している。 で は In the TIG welding torch 1B of the present embodiment, the above-described cooling tip 7B is attached in a state of being thermally connected to the collet body 5. The non-consumable electrode 2 is in contact with the cooling chip 7B with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7B.
　すなわち、本実施形態のＴＩＧ溶接用トーチ１Ｂでは、冷却チップ７Ｂを介して、冷却液（水）Ｗの循環により冷却されるコレットボディ５と非消耗電極２とが熱的に接続された状態となっている。これにより、非消耗電極２の冷却効果を上げることができ、この非消耗電極２のアーク熱による消耗を抑制することが可能である。また、冷却チップ７Ｂの交換も容易である。 That is, in the TIG welding torch 1B of the present embodiment, the state where the collet body 5 and the non-consumable electrode 2 that are cooled by the circulation of the cooling liquid (water) W are thermally connected via the cooling tip 7B. Has become. Thereby, the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed. Further, replacement of the cooling chip 7B is also easy.
（第２の変型例）
　次に、本発明の第２の変形例として、例えば図３（ａ）および（ｂ）に示すＴＩＧ溶接用トーチ１Ｃについて説明する。
　なお、図３（ａ）は、ＴＩＧ溶接用トーチ１Ｃの構成を示す断面図である。図３（ｂ）は、ＴＩＧ溶接用トーチ１Ｃを先端側から見た平面図である。また、以下の説明では、上記ＴＩＧ溶接用トーチ１Ａと同等の部位については、説明を省略すると共に、図面において同じ符号を付すものとする。 (Second modified example)
Next, as a second modified example of the present invention, for example, a TIG welding torch 1C shown in FIGS. 3A and 3B will be described.
FIG. 3A is a cross-sectional view illustrating the configuration of the torch 1C for TIG welding. FIG. 3B is a plan view of the TIG welding torch 1C as viewed from the front end side. In the following description, the same parts as those of the TIG welding torch 1A will not be described, and will be denoted by the same reference numerals in the drawings.
　本実施形態のＴＩＧ溶接用トーチ１Ｃは、上記ＴＩＧ溶接用トーチ１Ａが備える冷却チップ７Ａの代わりに、冷却チップ７Ｃを備える以外は、上記ＴＩＧ溶接用トーチ１Ａと基本的に同じ構成を有している。 The TIG welding torch 1C of the present embodiment has basically the same configuration as the TIG welding torch 1A, except that the TIG welding torch 1C includes a cooling tip 7C instead of the cooling tip 7A included in the TIG welding torch 1A. I have.
　具体的には、このＴＩＧ溶接用トーチ１Ｃにおいて、冷却チップ７Ｃは、ガス放出口９として、上記冷却チップ７Ａが備える複数の孔部９ａの代わりに、複数の切欠部９ｂを有している。複数のスリット部９ｂは、中心孔７ａの周面に設けられている。また、各切欠部９ｂは、中心孔７ａの周面を軸線方向に切り欠くように形成されている。
　なお、図３に示す例では切欠部９ｂは４か所に設けられているが、これに限定されない。また、中央孔７ａの周面に断面半円状の切欠部９ｂを設けたが、断面半円状には限定されない。 More specifically, in this TIG welding torch 1C, the cooling tip 7C has a plurality of cutouts 9b as gas discharge ports 9 instead of the plurality of holes 9a provided in the cooling tip 7A. The plurality of slits 9b are provided on the peripheral surface of the center hole 7a. Each notch 9b is formed so as to cut out the peripheral surface of the center hole 7a in the axial direction.
In addition, in the example shown in FIG. 3, the cutout portions 9b are provided at four positions, but the present invention is not limited to this. Further, the cutout 9b having a semicircular cross section is provided on the peripheral surface of the central hole 7a, but the cutout is not limited to the semicircular cross section.
　また、冷却チップ７Ｃは、その先端から複数の切欠部９ｂ（ガス放出口９）の周囲を囲むように円筒状に突出されたノズル部７ｂを有している。この構成の場合、複数の切欠部９ｂ（ガス放出口９）から放出された第１のシールドガスＧ１をノズル部７ｂにより絞り込むことができる。 {Circle around (7)} The cooling chip 7C has a nozzle portion 7b which is cylindrically protruded from the tip thereof so as to surround the plurality of cutouts 9b (gas discharge ports 9). In the case of this configuration, the first shield gas G1 discharged from the plurality of cutouts 9b (gas discharge ports 9) can be narrowed down by the nozzle 7b.
　本実施形態のＴＩＧ溶接用トーチ１Ｃでは、上述した冷却チップ７Ｃがコレットボディ５と熱的に接続された状態で取り付けられている。また、冷却チップ７Ｃの中心孔７ａから非消耗電極２の先端を突出させた状態で、この非消耗電極２が冷却チップ７Ｃと接触している。 で は In the TIG welding torch 1C of the present embodiment, the cooling tip 7C described above is attached in a state of being thermally connected to the collet body 5. The non-consumable electrode 2 is in contact with the cooling chip 7C with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7C.
　すなわち、本実施形態のＴＩＧ溶接用トーチ１Ｃでは、冷却チップ７Ｃを介して、冷却液（水）Ｗの循環により冷却されるコレットボディ５と非消耗電極２とが熱的に接続された状態となっている。これにより、非消耗電極２の冷却効果を上げることができ、この非消耗電極２のアーク熱による消耗を抑制することが可能である。また、冷却チップ７Ｃの交換も容易である。 That is, in the TIG welding torch 1C of the present embodiment, the state in which the collet body 5 and the non-consumable electrode 2 that are cooled by the circulation of the cooling liquid (water) W are thermally connected via the cooling tip 7C. Has become. Thereby, the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed. In addition, replacement of the cooling chip 7C is easy.
（第３の変型例）
　次に、本発明の第３の変形例として、例えば図４（ａ）および（ｂ）に示すＴＩＧ溶接用トーチ１Ｄについて説明する。
　なお、図４（ａ）は、ＴＩＧ溶接用トーチ１Ｄの構成を示す断面図である。図４（ｂ）は、ＴＩＧ溶接用トーチ１Ｄを先端側から見た平面図である。また、以下の説明では、上記ＴＩＧ溶接用トーチ１Ａと同等の部位については、説明を省略すると共に、図面において同じ符号を付すものとする。 (Third modified example)
Next, as a third modified example of the present invention, for example, a TIG welding torch 1D shown in FIGS. 4A and 4B will be described.
FIG. 4A is a cross-sectional view illustrating a configuration of the torch 1D for TIG welding. FIG. 4B is a plan view of the TIG welding torch 1D as viewed from the distal end side. In the following description, the same parts as those of the TIG welding torch 1A will not be described, and will be denoted by the same reference numerals in the drawings.
　本実施形態のＴＩＧ溶接用トーチ１Ｄは、上記ＴＩＧ溶接用トーチ１Ａが備える冷却チップ７Ａの代わりに、冷却チップ７Ｄを備える以外は、上記ＴＩＧ溶接用トーチ１Ａと基本的に同じ構成を有している。 The TIG welding torch 1D of the present embodiment has basically the same configuration as the TIG welding torch 1A except that a cooling tip 7D is provided instead of the cooling tip 7A provided in the TIG welding torch 1A. I have.
　具体的に、このＴＩＧ溶接用トーチ１Ｄにおいて、冷却チップ７Ｄは、ガス放出口９として、上記冷却チップ７Ａが備える複数の孔部９ａの代わりに、複数の切欠部９ｃを有している。複数の切欠部９ｃは、中心孔７ａの周囲に並んで設けられている。また、各切欠部９ｃは、冷却チップ７Ｄの先端側を周方向に分断しながら軸線方向に切り欠くように形成されている。つまり、非消耗電極２を中心に、十字状に切り欠き部９ｃが設けられている。
　なお、図４に示す例では切り欠き部９ｃは４か所に設けられているが、これに限定されない。 Specifically, in this TIG welding torch 1D, the cooling chip 7D has a plurality of cutouts 9c as the gas discharge ports 9 instead of the plurality of holes 9a provided in the cooling chip 7A. The plurality of cutouts 9c are provided side by side around the center hole 7a. Further, each notch 9c is formed so as to cut out in the axial direction while dividing the distal end side of the cooling chip 7D in the circumferential direction. That is, the notch 9 c is provided in a cross shape around the non-consumable electrode 2.
In addition, in the example shown in FIG. 4, the cutout portions 9c are provided at four positions, but the present invention is not limited to this.
　本実施形態のＴＩＧ溶接用トーチ１Ｄでは、上述した冷却チップ７Ｄがコレットボディ５と熱的に接続された状態で取り付けられている。また、冷却チップ７Ｄの中心孔７ａから非消耗電極２の先端を突出させた状態で、この非消耗電極２が冷却チップ７Ｄと接触している。 で は In the TIG welding torch 1D of the present embodiment, the cooling tip 7D described above is attached in a state of being thermally connected to the collet body 5. The non-consumable electrode 2 is in contact with the cooling chip 7D with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7D.
　すなわち、本実施形態のＴＩＧ溶接用トーチ１Ｄでは、冷却チップ７Ｄを介して、冷却液（水）Ｗの循環により冷却されるコレットボディ５と非消耗電極２が熱的に接続された状態となっている。これにより、非消耗電極２の冷却効果を上げることができ、この非消耗電極２のアーク熱による消耗を抑制することが可能である。また、冷却チップ７Ｄの交換も容易である。 That is, in the TIG welding torch 1D of the present embodiment, the collet body 5 and the non-consumable electrode 2 that are cooled by the circulation of the cooling liquid (water) W are thermally connected via the cooling tip 7D. ing. Thereby, the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed. Further, replacement of the cooling chip 7D is also easy.
（第４の変型例）
　次に、本発明の第４の変形例として、例えば図５（ａ）および（ｂ）に示すＴＩＧ溶接用トーチ１Ｅについて説明する。
　なお、図５（ａ）は、ＴＩＧ溶接用トーチ１Ｅの構成を示す断面図である。図５（ｂ）は、ＴＩＧ溶接用トーチ１Ｅを先端側から見た平面図である。また、以下の説明では、上記ＴＩＧ溶接用トーチ１Ａと同等の部位については、説明を省略すると共に、図面において同じ符号を付すものとする。 (Fourth modified example)
Next, as a fourth modified example of the present invention, for example, a TIG welding torch 1E shown in FIGS. 5A and 5B will be described.
FIG. 5A is a cross-sectional view illustrating the configuration of the torch 1E for TIG welding. FIG. 5B is a plan view of the TIG welding torch 1E as viewed from the distal end side. In the following description, the same parts as those of the TIG welding torch 1A will not be described, and will be denoted by the same reference numerals in the drawings.
　本実施形態のＴＩＧ溶接用トーチ１Ｅは、上記ＴＩＧ溶接用トーチ１Ａが備える冷却チップ７Ａの代わりに、冷却チップ７Ｅを備える以外は、上記ＴＩＧ溶接用トーチ１Ａと基本的に同じ構成を有している。 The TIG welding torch 1E of the present embodiment has basically the same configuration as the TIG welding torch 1A, except that the TIG welding torch 1E includes a cooling tip 7E instead of the cooling tip 7A included in the TIG welding torch 1A. I have.
　具体的に、このＴＩＧ溶接用トーチ１Ｅにおいて、冷却チップ７Ｅは、上記冷却チップ７Ａが備える複数の孔部９ａ（ガス放出口９）を省略した構成である。これにより、本実施形態のＴＩＧ溶接用トーチ１Ｅは、トーチノズル６から第２のシールドガスＧ２のみを放出する構成となっている。 Specifically, in the TIG welding torch 1E, the cooling tip 7E has a configuration in which the plurality of holes 9a (gas discharge ports 9) provided in the cooling tip 7A are omitted. Thus, the TIG welding torch 1E of the present embodiment is configured to discharge only the second shield gas G2 from the torch nozzle 6.
　本実施形態のＴＩＧ溶接用トーチ１Ｅでは、上述した冷却チップ７Ｅがコレットボディ５と熱的に接続された状態で取り付けられている。また、冷却チップ７Ｅの中心孔７ａから非消耗電極２の先端を突出させた状態で、この非消耗電極２が冷却チップ７Ｅと接触している。 で は In the TIG welding torch 1E of the present embodiment, the above-described cooling tip 7E is attached in a state of being thermally connected to the collet body 5. The non-consumable electrode 2 is in contact with the cooling chip 7E with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7E.
　すなわち、本実施形態のＴＩＧ溶接用トーチ１Ｅでは、冷却チップ７Ｅを介して、冷却液（水）Ｗの循環により冷却されるコレットボディ５と非消耗電極２とが熱的に接続された状態となっている。これにより、非消耗電極２の冷却効果を上げることができ、この非消耗電極２のアーク熱による消耗を抑制することが可能である。また、冷却チップ７Ｅの交換も容易である。 That is, in the TIG welding torch 1E of the present embodiment, the state where the collet body 5 and the non-consumable electrode 2 that are cooled by the circulation of the cooling liquid (water) W are thermally connected via the cooling tip 7E. Has become. Thereby, the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed. In addition, replacement of the cooling chip 7E is easy.
（第５の変型例）
　次に、本発明の第５の変形例として、例えば図６に示すＴＩＧ溶接用トーチ１Ｆについて説明する。
　なお、図６は、ＴＩＧ溶接用トーチ１Ｆの構成を示す断面図である。また、以下の説明では、上記ＴＩＧ溶接用トーチ１Ａと同等の部位については、説明を省略すると共に、図面において同じ符号を付すものとする。 (Fifth modified example)
Next, as a fifth modification of the present invention, for example, a TIG welding torch 1F shown in FIG. 6 will be described.
FIG. 6 is a sectional view showing the configuration of the torch 1F for TIG welding. In the following description, the same parts as those of the TIG welding torch 1A will not be described, and will be denoted by the same reference numerals in the drawings.
　本実施形態のＴＩＧ溶接用トーチ１Ｆは、上記ＴＩＧ溶接用トーチ１Ａが備える冷却チップ７Ａの代わりに、冷却チップ７Ｆを備える以外は、上記ＴＩＧ溶接用トーチ１Ａと基本的に同じ構成を有している。 The TIG welding torch 1F of the present embodiment has basically the same configuration as the TIG welding torch 1A, except that the TIG welding torch 1A includes a cooling tip 7F instead of the cooling tip 7A included in the TIG welding torch 1A. I have.
　具体的に、このＴＩＧ溶接用トーチ１Ｆにおいて、冷却チップ７Ｆは、上記冷却チップ７Ａが備える複数の孔部９ａ（ガス放出口９）を省略した構成である。これにより、本実施形態のＴＩＧ溶接用トーチ１Ｆは、トーチノズル６から第２のシールドガスＧ２のみを放出する構成となっている。 Specifically, in the TIG welding torch 1F, the cooling chip 7F has a configuration in which a plurality of holes 9a (gas discharge ports 9) provided in the cooling chip 7A are omitted. Thus, the TIG welding torch 1F of the present embodiment is configured to discharge only the second shield gas G2 from the torch nozzle 6.
　また、冷却チップ７Ｆは、コレットボディ５と共に、ウォータージャケット４の一部を構成している。このため、ウォータージャケット４を構成するコレットボディ５と冷却チップ７Ｆとの間は、Ｏリング１０によって液密に封止（シール）されている。これにより、冷却チップ７Ｆは、コレットボディ５と共に、ウォータージャケット４を流れる冷却液（水）Ｗにより冷却されることになる。 {Circle around (7)} The cooling chip 7F, together with the collet body 5, constitutes a part of the water jacket 4. For this reason, the space between the collet body 5 and the cooling tip 7F constituting the water jacket 4 is liquid-tightly sealed by the O-ring 10. Thereby, the cooling chip 7F is cooled by the cooling liquid (water) W flowing through the water jacket 4 together with the collet body 5.
　本実施形態のＴＩＧ溶接用トーチ１Ｆでは、上述した冷却チップ７Ｆがコレットボディ５と熱的に接続された状態で取り付けられると共に、冷却液（水）Ｗの循環によりコレットボディ５及び冷却チップ７Ｆを冷却している。また、冷却チップ７Ｆの中心孔７ａから非消耗電極２の先端を突出させた状態で、この非消耗電極２が冷却チップ７Ｆと接触している。 In the TIG welding torch 1F of the present embodiment, the cooling tip 7F described above is attached in a state of being thermally connected to the collet body 5, and the collet body 5 and the cooling tip 7F are circulated by the circulation of the cooling liquid (water) W. Cooling. The non-consumable electrode 2 is in contact with the cooling chip 7F with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7F.
　すなわち、本実施形態のＴＩＧ溶接用トーチ１Ｆでは、冷却液（水）Ｗの循環により冷却される冷却チップ７Ｆと非消耗電極２が熱的に接続された状態となっている。これにより、非消耗電極２の冷却効果を上げることができ、この非消耗電極２のアーク熱による消耗を抑制することが可能である。また、冷却チップ７Ｆの交換も容易である。 That is, in the TIG welding torch 1F of the present embodiment, the cooling tip 7F cooled by the circulation of the cooling liquid (water) W and the non-consumable electrode 2 are in a state of being thermally connected. Thereby, the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed. In addition, replacement of the cooling chip 7F is easy.
（第６の変型例）
　次に、本発明の第６の変形例として、例えば図７に示すＴＩＧ溶接用トーチ１Ｇについて説明する。
　なお、図７は、ＴＩＧ溶接用トーチ１Ｇの構成を示す断面図である。また、以下の説明では、上記ＴＩＧ溶接用トーチ１Ａと同等の部位については、説明を省略すると共に、図面において同じ符号を付すものとする。 (Sixth modified example)
Next, as a sixth modification of the present invention, for example, a TIG welding torch 1G shown in FIG. 7 will be described.
FIG. 7 is a sectional view showing the configuration of the torch 1G for TIG welding. In the following description, the same parts as those of the TIG welding torch 1A will not be described, and will be denoted by the same reference numerals in the drawings.
　本実施形態のＴＩＧ溶接用トーチ１Ｇは、上記ＴＩＧ溶接用トーチ１Ａが備える冷却チップ７Ａの代わりに、冷却チップ７Ｇを備える以外は、上記ＴＩＧ溶接用トーチ１Ａと基本的に同じ構成を有している。 The TIG welding torch 1G of the present embodiment has basically the same configuration as the TIG welding torch 1A except that the TIG welding torch 1A includes a cooling tip 7G instead of the cooling tip 7A included in the TIG welding torch 1A. I have.
　具体的に、このＴＩＧ溶接用トーチ１Ｇにおいて、冷却チップ７Ｇは、上記冷却チップ７Ａが備える複数の孔部９ａ（ガス放出口９）を省略した構成である。これにより、本実施形態のＴＩＧ溶接用トーチ１Ｇは、トーチノズル６から第２のシールドガスＧ２のみを放出する構成となっている。 Specifically, in this TIG welding torch 1G, the cooling chip 7G has a configuration in which the plurality of holes 9a (gas discharge ports 9) provided in the cooling chip 7A are omitted. Thus, the TIG welding torch 1G of the present embodiment is configured to discharge only the second shield gas G2 from the torch nozzle 6.
　また、冷却チップ７Ｇの中心孔７ａには、非消耗電極２の尖形となる先端部と当接される縮径部７ｃが設けられている。縮径部７ｃは、非消耗電極２の先端部を貫通させる程度に縮径されている。これにより、冷却チップ７Ｇの先端部からは、中心孔７ａを貫通した非消耗電極２の先端部（テーパー状の部分）のみを突出させることが可能となっている。 {Circle around (7)} The central hole 7a of the cooling tip 7G is provided with a reduced diameter portion 7c which comes into contact with the pointed tip of the non-consumable electrode 2. The reduced diameter portion 7c is reduced in diameter so as to penetrate the tip of the non-consumable electrode 2. This allows only the tip (tapered portion) of the non-consumable electrode 2 to penetrate through the center hole 7a from the tip of the cooling chip 7G.
　本実施形態のＴＩＧ溶接用トーチ１Ｇでは、上述した冷却チップ７Ｇがコレットボディ５と熱的に接続された状態で取り付けられている。また、冷却チップ７Ｇの中心孔７ａから非消耗電極２の先端を突出させた状態で、この非消耗電極２が冷却チップ７Ｇと接触している。 で は In the torch 1G for TIG welding of the present embodiment, the cooling tip 7G described above is attached in a state of being thermally connected to the collet body 5. The non-consumable electrode 2 is in contact with the cooling chip 7G with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7G.
　すなわち、本実施形態のＴＩＧ溶接用トーチ１Ｇでは、冷却チップ７Ｇを介して、冷却液（水）Ｗの循環により冷却されるコレットボディ５と非消耗電極２とが熱的に接続された状態となっている。これにより、非消耗電極２の冷却効果を上げることができ、この非消耗電極２のアーク熱による消耗を抑制することが可能である。また、冷却チップ７Ｇの交換も容易である。 That is, in the TIG welding torch 1G of the present embodiment, the state in which the collet body 5 and the non-consumable electrode 2 that are cooled by the circulation of the cooling liquid (water) W are thermally connected via the cooling tip 7G. Has become. Thereby, the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed. In addition, replacement of the cooling chip 7G is easy.
（第２の実施形態）
　次に、本発明の第２の実施形態として、例えば図８及び図９に示すＴＩＧ溶接用トーチ１Ｈについて説明する。
　なお、図８は、ＴＩＧ溶接用トーチ１Ｈの構成を示す断面斜視図である。図９は、ＴＩＧ溶接用トーチ１Ｈの要部を拡大した断面斜視図である。また、以下の説明では、上記ＴＩＧ溶接用トーチ１Ａと同等の部位については、説明を省略すると共に、図面において同じ符号を付すものとする。 (Second embodiment)
Next, as a second embodiment of the present invention, for example, a TIG welding torch 1H shown in FIGS. 8 and 9 will be described.
FIG. 8 is a sectional perspective view showing the configuration of the torch 1H for TIG welding. FIG. 9 is an enlarged sectional perspective view of a main part of the torch 1H for TIG welding. In the following description, the same parts as those of the TIG welding torch 1A will not be described, and will be denoted by the same reference numerals in the drawings.
　本実施形態のＴＩＧ溶接用トーチ１Ｈは、被溶接物Ｓ（図８、９において図示せず。）との間でアークを発生させる非消耗電極２Ａと、非消耗電極２Ａを内側に挿入した状態で支持するコレット３Ａと、非消耗電極２Ａを先端側から突出させた状態でコレット３Ａを内側に保持すると共に、冷却液Ｗが循環されるウォータージャケット（流路）４Ａが設けられたコレットボディ５Ａと、コレットボディ５Ａが取り付けられるトーチボディ１１と、非消耗電極２Ａの周囲を囲んだ状態でトーチボディ１１に取り付けられると共に、アークによって生じた被溶接物Ｓの溶融池に向かってシールドガスを放出するトーチノズル６Ａと、コレットボディ５Ａと熱的に接続された状態で取り付けられると共に、その先端から非消耗電極２Ａを突出させる中心孔７ａが設けられた冷却チップ７Ｈとを概略備えている。 The TIG welding torch 1H of the present embodiment has a non-consumable electrode 2A that generates an arc between the TIG welding torch 1H and the workpiece S (not shown in FIGS. 8 and 9), and a state where the non-consumable electrode 2A is inserted inside. A collet body 5A provided with a collet 3A supported by a collet and a water jacket (flow path) 4A through which the coolant W is circulated while the collet 3A is held inside with the non-consumable electrode 2A protruding from the front end side. And the torch body 11 to which the collet body 5A is attached and the torch body 11 which is attached to the torch body 11 in a state surrounding the non-consumable electrode 2A, and discharges the shielding gas toward the weld pool of the workpiece S generated by the arc. The torch nozzle 6A and the collet body 5A are attached in a thermally connected state, and the non-consumable electrode 2A projects from the tip thereof. Central hole 7a is provided with schematically a cooling tip 7H provided.
　このうち、非消耗電極２Ａは、上記非消耗電極２と同様の構成を有しているが、本実施形態では、上記非消耗電極２よりも長尺のものを用いている。また、コレット３Ａは、貫通孔３ａと、複数のスリット３ｂと、先端部分３ｃと、テーバー部３ｄといった上記コレット３と同様の構成を有しているが、本実施形態では、上記コレット３Ａよりも長尺のものを用いている。 う ち The non-consumable electrode 2A has the same configuration as the non-consumable electrode 2, but in this embodiment, the non-consumable electrode 2A is longer than the non-consumable electrode 2. The collet 3A has the same configuration as the above-mentioned collet 3 such as the through-hole 3a, the plurality of slits 3b, the tip portion 3c, and the tabber portion 3d. Long ones are used.
　コレットボディ５Ａは、貫通孔５ａと、センターノズル５ｃと、ガス供給口５ｄ（図８、９において図示せず。）といった上記コレットボディ５と同様の構成を有しているが、上記コレットボディ５よりも長尺のものを用いている。また、コレットボディ５Ａの後端側には、トーチキャップ８Ａが螺合により着脱自在に取り付けられている。トーチキャップ８Ａには、第１のシールドガスＧ１を貫通孔５ａに向けて供給するガス供給口８ａが設けられている。 The collet body 5A has the same configuration as the collet body 5 such as a through hole 5a, a center nozzle 5c, and a gas supply port 5d (not shown in FIGS. 8 and 9). It is longer than that. A torch cap 8A is detachably attached to the rear end side of the collet body 5A by screwing. The torch cap 8A is provided with a gas supply port 8a for supplying the first shield gas G1 toward the through hole 5a.
　トーチボディ１１は、例えば軟鋼やステンレス鋼などの鋼材又は真鍮等を用いて概略円筒状に形成された外筒部材１２と、絶縁樹脂を用いて概略円筒状に形成された絶縁部材１３とを有している。 The torch body 11 has an outer cylindrical member 12 formed in a substantially cylindrical shape using a steel material such as mild steel or stainless steel or brass, for example, and an insulating member 13 formed in a substantially cylindrical shape using an insulating resin. are doing.
　 外筒部材１２は、非消耗電極２Ａに電力を供給する給電部を形成している。また、外筒部材１２の内側に形成された貫通孔１２ａは、その中心に非消耗電極２Ａを配置すると共に、非消耗電極２Ａの周囲からコレットボディ５Ａの貫通孔５ａに向けて第１のシールドガスＧ１を供給する流路を形成している。 The outer cylinder member 12 forms a power supply unit for supplying power to the non-consumable electrode 2A. The non-consumable electrode 2A is disposed at the center of the through-hole 12a formed inside the outer cylindrical member 12, and the first shield extends from the periphery of the non-consumable electrode 2A toward the through-hole 5a of the collet body 5A. A flow path for supplying the gas G1 is formed.
　コレットボディ５Ａは、貫通孔１２ａの内側に挿入された状態で、外筒部材１２に対して螺合により着脱自在に取り付けられている。また、外筒部材１２は、コレットボディ５Ａの外周面との間で第２のシールドガスＧ２が流れる流路を形成している。 The collet body 5A is detachably attached to the outer cylinder member 12 by being screwed into the collet body 12 in a state of being inserted inside the through hole 12a. Further, the outer cylinder member 12 forms a flow path through which the second shield gas G2 flows between the outer cylinder member 12 and the outer peripheral surface of the collet body 5A.
　絶縁部材１３は、コレットボディ５Ａの外周部を覆うと共に、貫通孔１２ａの内側に挿入された状態で、外筒部材１２に対して螺合により着脱自在に取り付けられている。 The insulation member 13 covers the outer peripheral portion of the collet body 5A and is detachably attached to the outer cylinder member 12 by being screwed into the outer cylinder member 12 while being inserted inside the through hole 12a.
　コレットボディ５Ａと外筒部材１２との間には、冷却液（水）Ｗが循環されるウォータージャケット（流路）１４が設けられている。ウォータージャケット１４は、外筒部材１２の内周面を周方向に切り欠くリング状の溝部１２ｂと、コレットボディ５Ａの外周面とによって構成されている。また、ウォータージャケット１４を構成するコレットボディ５Ａと外筒部材１２との間は、Ｏリング１５によって液密に封止（シール）されている。Ｏリング１５は、ウォータージャケット１４を挟んだ軸線方向の両側にそれぞれ配置されている。 ウ ォ ー タ ー A water jacket (flow path) 14 through which a coolant (water) W is circulated is provided between the collet body 5A and the outer cylinder member 12. The water jacket 14 includes a ring-shaped groove 12b that cuts the inner peripheral surface of the outer cylinder member 12 in the circumferential direction, and an outer peripheral surface of the collet body 5A. The space between the collet body 5A and the outer cylinder member 12 constituting the water jacket 14 is liquid-tightly sealed by an O-ring 15. The O-rings 15 are arranged on both sides of the water jacket 14 in the axial direction.
　ウォータージャケット４Ａ、１４は、冷却液（水）Ｗの循環によりコレットボディ５Ａを冷却する冷却機構（チラー）５０（図８、９において図示せず。）と接続されている。これにより、コレットボディ５Ａは、ウォータージャケット４Ａ、１４を流れる冷却液（水）Ｗにより冷却されることになる。 The water jackets 4A and 14 are connected to a cooling mechanism (chiller) 50 (not shown in FIGS. 8 and 9) for cooling the collet body 5A by circulating the cooling liquid (water) W. As a result, the collet body 5A is cooled by the coolant (water) W flowing through the water jackets 4A and 14.
　トーチノズル６Ａは、上記トーチノズル６と同様の構成を有しているが、本実施形態では、コレットボディ５Ａの外周面との間で第２のシールドガスＧ２が流れる流路を形成すると共に、外筒部材１２の外周面に螺合により着脱自在に取り付けられている。また、トーチノズル６Ａは、その先端側が漸次縮径されたノズル形状を有している。 The torch nozzle 6A has a configuration similar to that of the torch nozzle 6, but in the present embodiment, a flow path through which the second shield gas G2 flows is formed between the torch nozzle 6A and the outer peripheral surface of the collet body 5A. It is detachably attached to the outer peripheral surface of the member 12 by screwing. Further, the torch nozzle 6A has a nozzle shape whose tip end side is gradually reduced in diameter.
　冷却チップ７Ｈは、概略円筒状に形成されて、コレットボディ５Ａの先端側から内側に挿入された状態で、コレットボディ５Ａに対して螺合により着脱自在に取り付けられている。また、冷却チップ７Ｈの先端には、拡径方向に突出したフランジ部７ｄが設けられている。冷却チップ７Ｈは、このフランジ部７ｄがコレットボディ５Ａの先端に当接した状態で取り付けられている。 The cooling chip 7H is formed in a substantially cylindrical shape, and is detachably attached to the collet body 5A by being screwed into the collet body 5A in a state where the cooling tip 7H is inserted inward from the front end side of the collet body 5A. At the tip of the cooling chip 7H, a flange portion 7d protruding in the diameter increasing direction is provided. The cooling chip 7H is attached with the flange portion 7d in contact with the tip of the collet body 5A.
　冷却チップ７Ｈは、コレット３Ａと接触している。具体的に、中心孔７ａをなす周壁には、コレット３Ａのテーパー部３ｄが当接される縮径部７ｅが設けられている。縮径部７ｅは、非消耗電極２Ａを貫通させる程度に縮径されている。これにより、冷却チップ７Ｈの先端部からは、中心孔７ａを貫通した非消耗電極２Ａのみを突出させることが可能となっている。 The cooling tip 7H is in contact with the collet 3A. Specifically, a reduced diameter portion 7e to which the tapered portion 3d of the collet 3A abuts is provided on the peripheral wall forming the center hole 7a. The reduced diameter portion 7e is reduced in diameter so as to penetrate the non-consumable electrode 2A. This allows only the non-consumable electrode 2A that has penetrated the center hole 7a to protrude from the tip of the cooling chip 7H.
　また、冷却チップ７Ｈは、コレットボディ５Ａと共に、ウォータージャケット４Ａの一部を構成している。このため、ウォータージャケット４Ａを構成するコレットボディ５Ａと冷却チップ７Ｈとの間は、Ｏリング１０Ａによって液密に封止（シール）されている。これにより、冷却チップ７Ｈは、コレットボディ５Ａと共に、ウォータージャケット４Ａを流れる冷却液（水）Ｗにより冷却されることになる。 {Circle around (5)} The cooling chip 7H forms a part of the water jacket 4A together with the collet body 5A. Therefore, the space between the collet body 5A and the cooling tip 7H constituting the water jacket 4A is liquid-tightly sealed by the O-ring 10A. Thus, the cooling chip 7H is cooled by the cooling liquid (water) W flowing through the water jacket 4A together with the collet body 5A.
　以上のような構成を有するＴＩＧ溶接用トーチ１Ｈは、電源装置６０（図８、９において図示せず。）と接続されている。電源装置６０は、ＴＩＧ溶接用トーチ１Ｈと溶接ケーブル（図示せず。）を介して接続されて、ＴＩＧ溶接用トーチ１Ｈへの電力並びに第１及び第２のシールドガスＧ１、Ｇ２の供給を行う。 Ｔ The TIG welding torch 1H having the above configuration is connected to a power supply device 60 (not shown in FIGS. 8 and 9). The power supply device 60 is connected to the TIG welding torch 1H via a welding cable (not shown) to supply power to the TIG welding torch 1H and the first and second shield gases G1, G2. .
　電源装置６０では、図示を省略するものの、マイナス(－)端子側にトーチ側ケーブル６１ａを介して非消耗電極２Ａが電気的に接続され、且つ、プラス(＋)端子側に母材側ケーブル６１ｂを介して被溶接物Ｓが電気的に接続されている。 In the power supply device 60, although not shown, the non-consumable electrode 2A is electrically connected to the minus (-) terminal side via a torch-side cable 61a, and the base material side cable 61b is connected to the plus (+) terminal side. To be welded S is electrically connected via the.
　これにより、非消耗電極２Ａと被溶接物Ｓとの間でアークを発生させて、このアークの熱により被溶接物Ｓを溶かして溶融池（プール）を形成しながら溶接が行われる。また、溶接中は非消耗電極２Ａの周囲を囲むトーチノズル６Ａから第１及び第２のシールドガスＧ１、Ｇ２を放出し、これらのシールドガスＧ１、Ｇ２により大気（空気）を遮断しながら溶接が行われる。 Thus, an arc is generated between the non-consumable electrode 2A and the workpiece S, and welding is performed while melting the workpiece S by the heat of the arc to form a molten pool (pool). During welding, the first and second shield gases G1, G2 are released from the torch nozzle 6A surrounding the periphery of the non-consumable electrode 2A, and welding is performed while shielding the atmosphere (air) by these shield gases G1, G2. Will be
　本実施形態のＴＩＧ溶接用トーチ１Ｈでは、上述した冷却チップ７Ｈがコレットボディ５及びコレット３Ａと熱的に接続された状態で取り付けられると共に、冷却液（水）Ｗの循環によりコレットボディ５Ａ及び冷却チップ７Ｈが冷却されている。 In the TIG welding torch 1H of the present embodiment, the cooling tip 7H described above is mounted in a state of being thermally connected to the collet body 5 and the collet 3A, and the cooling liquid (water) W is circulated to cool the collet body 5A and the cooling. The chip 7H is being cooled.
　すなわち、本実施形態のＴＩＧ溶接用トーチ１Ｈでは、冷却液（水）Ｗの循環により冷却される冷却チップ７Ｈとコレット３Ａとが熱的に接続された状態となっている。これにより、コレット３Ａと熱的に接続された非消耗電極２Ａの冷却効果を上げることができ、この非消耗電極２Ａのアーク熱による消耗を抑制することが可能である。また、冷却チップ７Ｈの交換も容易である。 That is, in the TIG welding torch 1H of the present embodiment, the cooling tip 7H cooled by the circulation of the cooling liquid (water) W and the collet 3A are in a state of being thermally connected. Thereby, the cooling effect of the non-consumable electrode 2A thermally connected to the collet 3A can be improved, and it is possible to suppress the non-consumable electrode 2A from being consumed by the arc heat. In addition, replacement of the cooling chip 7H is easy.
　なお、本発明は、上記実施形態のものに必ずしも限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。
　例えば、上記冷却チップ７Ａ～７Ｄ、７Ｇについては、上記冷却チップ７Ｆと同様に、コレットボディ５と共に、ウォータージャケット４の一部を構成し、このウォータージャケット４を流れる冷却液（水）Ｗにより冷却される構成とすることも可能である。 The present invention is not necessarily limited to the above-described embodiment, and various changes can be made without departing from the spirit of the present invention.
For example, the cooling chips 7A to 7D and 7G constitute a part of the water jacket 4 together with the collet body 5, similarly to the cooling chip 7F, and are cooled by a cooling liquid (water) W flowing through the water jacket 4. It is also possible to adopt a configuration in which
　また、上記ＴＩＧ溶接用トーチ１Ａ～１Ｈでは、非消耗電極２、２Ａの先端が冷却チップ７Ａ～７Ｈの先端よりも外側に突き出した状態となっているが、非消耗電極２、２Ａの先端を冷却チップ７Ａ～７Ｈの先端よりも内側に引き込んだ状態とすることで、プラズマアーク用トーチとして利用することも可能である。さらに、従来のプラズマアーク用トーチの先端に設けられた拘束チップを本発明の冷却チップ７Ａ～７Ｈに変更することで、プラズマアーク用トーチからＴＩＧ溶接用トーチに変換することも可能である。 Further, in the TIG welding torches 1A to 1H, the tips of the non-consumable electrodes 2 and 2A protrude outside the tips of the cooling tips 7A to 7H. The cooling chips 7A to 7H can be used as a plasma arc torch by being pulled inward from the tips. Further, by changing the constraining tip provided at the tip of the conventional plasma arc torch to the cooling tips 7A to 7H of the present invention, it is possible to convert the plasma arc torch to a TIG welding torch.
　１Ａ～１Ｈ…ＴＩＧ溶接用トーチ　２、２Ａ…非消耗電極　３、３Ａ…コレット　４、４Ａ…ウォータージャケット（流路）　５、５Ａ…コレットボディ　６、６Ａ…トーチノズル　７Ａ～７Ｈ…冷却チップ　７ａ…中心孔　７ｂ…ノズル部　８、８Ａ…トーチキャップ　９…ガス放出口　９ａ…孔部　９ｂ、９ｃ…切欠部　１０、１０Ａ…Ｏリング　１１…トーチボディ　１２…外筒部材　１３…絶縁部材　１４…ウォータージャケット　１５…Ｏリング　５０…冷却機構（チラー）　６０…電源装置　Ｇ１…第１のシールドガス　Ｇ２…第２のシールドガス 1A to 1H: Torch for TIG welding 2, 2, 2A: Non-consumable electrode 3, 3, 3A: Collet 4, 4, Water jacket (flow path) 5, 5A: Collet body 6, 6, A: Torch nozzle 7A to 7H: Cooling tip 7a: Center Hole # 7b Nozzle # 8, 8A Torch cap # 9 Gas outlet # 9a Hole # 9b, 9c Notch # 10, 10A O-ring # 11 Torch body # 12 Outer cylinder member # 13 Insulating member # 14 Water jacket # 15 ... O-ring $ 50 Cooling mechanism (chiller) $ 60 Power supply device G1 First shield gas G2 Second shield gas

Claims (9)

  1. 　被溶接物との間でアークを発生させる非消耗電極と、
    　前記非消耗電極を内側に挿入した状態で支持するコレットと、
    　前記非消耗電極を先端側から突出させた状態で前記コレットを内側に保持すると共に、冷却液が循環される流路が設けられたコレットボディと、
    　前記非消耗電極の周囲を囲んだ状態で、アークによって生じた被溶接物の溶融池に向かってシールドガスを放出するトーチノズルと、
    　前記コレットボディと熱的に接続された状態で取り付けられると共に、その先端から前記非消耗電極を突出させる中心孔が設けられた冷却チップとを備えるＴＩＧ溶接用トーチ。     A non-consumable electrode that generates an arc between the workpiece and the workpiece;
    A collet for supporting the non-consumable electrode while inserted inside,
    A collet body provided with a flow path through which a coolant is circulated, while holding the collet inside with the non-consumable electrode protruding from the tip side,
    In a state surrounding the non-consumable electrode, a torch nozzle that discharges a shielding gas toward a weld pool of the work piece generated by the arc,
    A TIG welding torch, comprising: a cooling tip which is attached in a state of being thermally connected to the collet body and has a center hole for projecting the non-consumable electrode from a tip thereof.
  2. 　前記冷却チップは、前記非消耗電極と接触していることを特徴とする請求項１に記載のＴＩＧ溶接用トーチ。 The TIG welding torch according to claim 1, wherein the cooling tip is in contact with the non-consumable electrode.
  3. 　前記冷却チップは、シールドガスを放出するガス放出口を有することを特徴とする請求項２に記載のＴＩＧ溶接用トーチ。 The TIG welding torch according to claim 2, wherein the cooling tip has a gas discharge port for discharging a shielding gas.
  4. 　前記ガス放出口は、前記中心孔の周囲に並んで設けられた複数の孔部により構成されていることを特徴とする請求項３に記載のＴＩＧ溶接用トーチ。 4. The torch for TIG welding according to claim 3, wherein the gas outlet comprises a plurality of holes provided side by side around the center hole. 5.
  5. 　前記ガス放出口は、前記中心孔の周囲に並んで設けられた複数の切欠部により構成されていることを特徴とする請求項３に記載のＴＩＧ溶接用トーチ。 4. The TIG welding torch according to claim 3, wherein the gas outlet comprises a plurality of cutouts provided side by side around the center hole. 5.
  6. 　前記冷却チップは、その先端から前記ガス放出口の周囲を囲むように突出されたノズル部を有することを特徴とする請求項３～５の何れか一項に記載のＴＩＧ溶接用トーチ。 The TIG welding torch according to any one of claims 3 to 5, wherein the cooling tip has a nozzle portion protruding from a tip end thereof so as to surround a periphery of the gas discharge port.
  7. 　前記冷却チップは、前記コレットと接触していることを特徴とする請求項１に記載のＴＩＧ溶接用トーチ。 The TIG welding torch according to claim 1, wherein the cooling tip is in contact with the collet.
  8. 　前記冷却チップは、前記コレットボディと共に、前記流路の一部を構成していることを特徴とする請求項７記載のＴＩＧ溶接用トーチ。 The torch according to claim 7, wherein the cooling tip forms a part of the flow path together with the collet body.
  9. 　前記冷却チップは、前記コレットボディの先端側から内側に挿入された状態で、前記コレットボディに対して着脱自在に取り付けられていることを特徴とする請求項８に記載のＴＩＧ溶接用トーチ。 The TIG welding torch according to claim 8, wherein the cooling tip is detachably attached to the collet body in a state where the cooling tip is inserted inward from a front end side of the collet body.
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JP6963699B1 (en) * 2020-08-03 2021-11-10 大陽日酸株式会社 Torch and its scanning method
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JPS5314639A (en) * 1976-07-28 1978-02-09 Toyota Motor Co Ltd Welding torch
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JPS60103578U (en) * 1983-12-20 1985-07-15 三菱重工業株式会社 Narrow gap TIG welding torch
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