WO2010018778A1 - Arc welding torch - Google Patents

Arc welding torch Download PDF

Info

Publication number
WO2010018778A1
WO2010018778A1 PCT/JP2009/063923 JP2009063923W WO2010018778A1 WO 2010018778 A1 WO2010018778 A1 WO 2010018778A1 JP 2009063923 W JP2009063923 W JP 2009063923W WO 2010018778 A1 WO2010018778 A1 WO 2010018778A1
Authority
WO
WIPO (PCT)
Prior art keywords
torch
arc
arc welding
welding
electrode
Prior art date
Application number
PCT/JP2009/063923
Other languages
French (fr)
Japanese (ja)
Inventor
伊香賀定
戸田雅規
Original Assignee
ミヤチテクノス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ミヤチテクノス株式会社 filed Critical ミヤチテクノス株式会社
Priority to JP2010524713A priority Critical patent/JPWO2010018778A1/en
Priority to CN200980131477.0A priority patent/CN102123815B/en
Publication of WO2010018778A1 publication Critical patent/WO2010018778A1/en

Links

Images

Classifications

    • 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
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
    • 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
    • B23K9/291—Supporting devices adapted for making use of shielding means the shielding means being a gas
    • B23K9/296—Supporting devices adapted for making use of shielding means the shielding means being a gas using non-consumable electrodes

Definitions

  • the present invention relates to an arc welding torch capable of preventing misfire as much as possible at the start of arc welding, and particularly preferably to an arc welding torch used for TIG welding.
  • TIG welding is a method in which an arc is generated between an object to be welded and an electrode made of tungsten, and welding is performed with the heat.
  • a shielding gas composed of argon is injected at the time of welding to block the atmosphere and prevent discoloration oxidation of the workpiece.
  • Japanese Utility Model Publication No. 58-76388 discloses a technical idea of forming a ceramic layer on the inner peripheral surface of the tip of the torch nozzle in order to prevent spatter from being deposited on the tip of the torch nozzle during arc welding.
  • JP 2003-290930 A discloses a fiber material having insulation and heat resistance around a shield gas outlet in order to avoid deterioration in welding quality due to blow holes or the like. A technical idea of providing such a filter is disclosed.
  • a guide member is provided at the tip of the plasma nozzle. The technical idea of avoiding attachment and contact between the plasma nozzle and the member to be welded is disclosed.
  • the present invention has been made to solve the above-described problems, and prevents misfire as much as possible at the time of arc welding, can continuously generate an arc with a simple structure, and as a whole welding apparatus.
  • An object of the present invention is to provide an arc welding torch capable of reducing the manufacturing cost.
  • an arc welding torch includes a torch body, an electrode provided at an axial center portion of the torch body, a collet holding the electrode, and a collet surrounding the collet. It has a body and a torch nozzle provided at the tip of the torch body and through which the electrode is inserted, and a conductive member is mounted on the inner peripheral surface of the torch nozzle.
  • the conductive member may surround the electrode.
  • the conductive member can be stably attached. An effect is obtained.
  • the conductive member may be a metal mesh or a metal plate.
  • the metal plate includes one having a plate thickness of less than 0.1 mm.
  • the metal mesh and the metal plate may be made of any one of SUS, copper, copper alloy, aluminum, and aluminum alloy.
  • arc welding torch of the present invention when used for TIG welding, arc misfire is suppressed, which is more preferable.
  • FIG. 4 is a block diagram of a main part of an experimental apparatus according to Example 2.
  • Example 6 is a graph showing changes of arc current with respect to time in Example 2. Experimental results showing the number of discharges and the presence or absence of misfire when arc discharge is repeatedly performed using an arc welding torch equipped with a conductive member, and arc discharge using an arc welding torch without a conductive member It is an experimental result which shows the frequency
  • the welding torch 10 has a torch body 16, and the torch body 16 has an electrode 18 provided at the center of the shaft and a collet 20.
  • the collet 20 is surrounded by a collet body 22, and the collet body 22 is screwed with a torch nozzle 24.
  • the electrode 18 is gripped by the collet 20, and its tip is slightly exposed to the outside from the torch nozzle 24 as will be described later.
  • the collet body 22 is formed with a plurality of gas outlet holes 28 for leading shield gas (argon gas in the present embodiment) to the space 26 formed between the electrode 18 and the torch nozzle 24.
  • the torch nozzle 24 is preferably made of alumina.
  • the torch nozzle 24 has a large-diameter base side on the torch body 16 side, and is formed in a cylindrical shape with a narrow diameter through a gentle shoulder toward the tip side of the electrode 18, that is, the outer diameter of the tip part. The shape is narrowed down to narrow down.
  • the central portion of the tip of the torch nozzle 24 is formed as an opening 30 having the same diameter and extending a predetermined distance.
  • the electrode 18 is inserted into the opening 30 and the tip protrudes from the opening 30.
  • a conductive member 34 is mounted so as to surround the base end side of the electrode 18 so as to fit inside the shoulder portion where the torch nozzle 24 is gradually throttled. Is done.
  • the conductive member 34 may be attached to a position other than the shoulder portion on the inner peripheral surface 32 of the torch nozzle 24.
  • the diameter of the inner peripheral surface 32 on the rear end side of the electrode 18 from the shoulder portion (that is, the base portion side of the torch nozzle) may be mounted at a substantially constant position. In this way, the conductive member 34 can be easily attached as compared with the case where the torch nozzle 24 is attached to the shoulder portion where the diameter is gradually reduced.
  • the conductive member 34 is formed in a mesh shape and is made of any one metal of, for example, stainless steel (SUS), copper, copper alloy, aluminum, and aluminum alloy.
  • SUS stainless steel
  • copper alloy for example, brass can be used.
  • the conductive member 34 may be attached to the inner peripheral surface 32 of the torch nozzle 24 using not only the frictional force generated between the conductive member 34 and the torch nozzle 24 but also an adhesive.
  • carbon dioxide, helium, or the like may be used as the shielding gas instead of argon gas.
  • the welding torch 10 according to the first embodiment of the present invention is basically configured as described above. Next, the operation, action, and effect will be described.
  • the front L-shaped workpieces W 1 and W 2 are arranged back to back at a predetermined position, and a welding torch 10 is attached to a welding site 42 where the workpieces W 1 and W 2 are in contact with each other.
  • the electrodes 18 are moved closer to each other by a predetermined distance. Preferably this distance is 5 mm.
  • the welding torch 10 does not misfire even if the TIG welding operation is continuously performed, and the arc forming space 44 is surely formed, and the TIG welding operation is continuously performed by obtaining a good shielding state from the atmosphere. can do.
  • the reason can be considered as follows. That is, in the prior art, an arc is generated from the tip of the electrode at the start of welding, but there is a phenomenon that the arc generation position rises from the tip of the electrode as the number of weldings is repeated. This is considered to be due to the influence of electrode oxidation and the like. The fact that the arc generation position climbs up from the tip of the electrode means that the arc generation position moves away from the workpiece. In other words, as the distance from the workpiece to the arc generation position becomes longer, the initial arc voltage gradually becomes higher and misfires occur frequently.
  • ionization means that electrons are ejected from an atom when an energy larger than the excited state is applied to the atom from the outside, and the minimum voltage required for this ionization is called “ionization voltage”. In order to generate plasma, energy higher than the ionization voltage must be applied.
  • Raising the ionization voltage means that the frequency of misfires is high on the premise that there is a situation where it is difficult to generate plasma.
  • the electrode is oxidized and gradually misfires are generated. It becomes easy to do.
  • the initial arc voltage is gradually increased, and the arc formation space 44 is formed again. If the misfire is repeated, the initial arc voltage will eventually become misfired even if the maximum voltage allowed by the high voltage generation circuit is applied.
  • the TIG welding operation is interrupted and the work such as polishing of the electrode tip is performed. Is required.
  • the initial arc voltage can be reduced, the load on the welding torch 10 and the TIG welding machine incorporating it can be reduced. Therefore, it becomes difficult for the failure of the high voltage generation circuit to occur and the TIG welding operation is less interrupted, so that the production efficiency of arc welding is improved. In some cases, the high voltage generation circuit may not be incorporated into the TIG welder.
  • FIG. 3 is an initial arc voltage waveform diagram with respect to the presence or absence of the conductive member 34.
  • a solid line A shown in FIG. 3 shows an initial arc voltage waveform of the welding torch 10 in which the conductive member 34 made of a metal mesh is incorporated on the inner peripheral surface 32 of the torch nozzle 24 according to the present embodiment, and a broken line a These show the initial arc voltage waveform of the TIG welding apparatus not equipped with the conductive member 34.
  • the initial arc voltage is a minimum value of a voltage necessary for forming the arc forming space 44. Note that the voltage shown on the vertical axis in FIG. 3 increases in the negative direction.
  • the welding torch 10 incorporating the conductive member 34 can obtain an initial arc voltage around 6200 V, but does not include the conductive member 34. In the art welding torch, about 11500V is the initial arc voltage.
  • the conductive member 134 is formed in a plate shape (thin plate shape) or a foil shape.
  • the conductive member 134 is made of any one of SUS, copper, copper alloy, aluminum, and aluminum alloy. It is configured.
  • the copper alloy for example, brass can be used.
  • the thickness of the conductive member 134 is set to such a size that the shield gas can sufficiently flow through the torch nozzle 24. Further, the thickness of the conductive member 134 can be set to less than 0.1 mm.
  • the metal plate or the metal foil is used for the conductive member 134 of the welding torch 100, the same effects as those of the first embodiment are obtained.
  • the arc welding torch according to the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.
  • the conductive member may be formed in a coil spring shape.
  • the conductive member may be mounted on the torch nozzle by depositing or coating a metal such as aluminum on the inner peripheral surface of the torch nozzle.
  • a metal such as aluminum
  • the torch nozzle need not have a shape that facilitates mounting of the conductive member. Therefore, the design freedom of the torch nozzle increases.
  • Example 1 TIG welding was performed using an arc welding torch configured as in the first embodiment described above. That is, in this embodiment, a metal mesh is used for the conductive member.
  • a copper plate was selected as the work piece, and a tungsten electrode ( ⁇ 2.5 mm) containing 1.5% by weight of lanthanum was used as the electrode.
  • 6 liters per minute was flowed using argon gas as a shielding gas.
  • the argon gas pre-purge time was 2 seconds.
  • Two seconds after flowing argon gas a welding current of 100 A was passed through the electrode.
  • the time until the welding current started to flow through the electrode and ended was 100 milliseconds.
  • the subsequent argon gas post-purge time was 2 seconds. Incidentally, the welding tact time was once every 5 seconds.
  • the welding results are as follows. That is, the number of misfires was zero in welding for about 2 hours (1440 times). Also, the retry start operation set for the welding power source (the function to restart from the welding power source when a misfire occurs) never worked. This indicates that the arc welding torch is extremely effective against misfire.
  • the initial arc voltage can be kept low, so that a specific effect that the burden on the high voltage generation circuit is reduced and the life of the welding power source is increased can be obtained.
  • the experimental apparatus 200 of the present example includes a welding power source (PULSETIG power source MAW-300A DC high voltage start type: manufactured by Miyachi Technos) 202 and a welding power source connected to one terminal 204 of the welding power source 202.
  • a torch (TA-23SSP: manufactured by Miyachi Technos) 206, a gas supply unit 208 for supplying a shielding gas (argon gas) to the welding torch 206, and a work 212 made of tough pitch copper connected to the other terminal 210 of the welding power source 202. It has.
  • the welding torch 206 has basically the same configuration as the welding torch 10 of the first embodiment described above, a torch body 214, an electrode ( ⁇ 1.6 mm) 216 made of tungsten containing 1.5% by weight of thorium, and a torch nozzle. 218, a conductive member 220, and the like.
  • the electrode 216 is attached to the torch body 214 so that the tip polishing angle is set to 40 ° and the protruding length (L1) from the torch nozzle 218 is 2 mm.
  • the welding torch 206 is fixed by a support member (not shown) so that the distance (L2) between the surface of the workpiece 212 and the tip of the electrode 216 is 1 mm.
  • the welding torch 206 and the workpiece 212 are connected to the terminals 204 and 210 of the welding power source 202 so that the electrode 216 is a cathode and the workpiece 212 is an anode.
  • the welding current was controlled as shown in the graph in FIG. Specifically, the start current was set to 20 A, the upslope time was set to 20 milliseconds, the welding current was set to 30 A, and the welding time was set to 50 milliseconds. In this example, downslope control was not performed, and the welding tact time was once every 3 seconds. The flow rate of the shielding gas was 3 liters per minute.
  • the upper limit of the number of arc discharges was basically 1500 times per set. However, for the SUS mesh, the upper limit of the number of arc discharges was 2100 times for the third set (see FIG. 8).
  • Comparative example Next, a comparative example will be described.
  • the comparative example used the experimental apparatus 200 of the present example in which the conductive member 220 is omitted.
  • the experimental conditions and measurement method were the same as in this example.
  • Example 2 The experimental results of this example and the comparative example will be described with reference to FIG.
  • misfires occurred at 44 times, 36 times, and 61 times, respectively, whereas in Example 2, 1500 times except for the first set and the second set of aluminum foil. There was no misfire during that time.
  • about the 3rd set of SUS mesh 2100 times of continuous discharge was possible, and there was no misfire in the meantime.
  • the aluminum foil sometimes misfired at 902 times and 1302 times, but continuous discharge was performed at least 20 times as many times as the comparative example.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)

Abstract

An arc welding torch (10) comprises a torch body (16), an electrode (18) that is provided at the axial center of the torch body, a collet (20) for holding the electrode, a collet body (22) that surrounds the collet (20), and a torch nozzle (24) that is provided at the front end of the torch body (16) and in which the electrode is inserted; and a conductive member (34) is attached to the inner circumferential surface (32) of the torch nozzle (24). The conductive member (34) is composed of a metallic mesh or a metallic plate.

Description

アーク溶接用トーチArc welding torch
　本発明は、アーク溶接開始時に失火を可及的に防止することを可能とするアーク溶接用トーチに関し、特に好適には、ＴＩＧ溶接に用いられるアーク溶接用トーチに関する。 The present invention relates to an arc welding torch capable of preventing misfire as much as possible at the start of arc welding, and particularly preferably to an arc welding torch used for TIG welding.
　従来からアーク溶接時に、溶融している金属に空気が接すると、大気中の窒素が該金属中に溶け込み、該溶融金属が凝固する際、溶け込んだ窒素が一気に析出し、泡となったまま該溶融金属が凝固し、ブローホール状態となることが知られている。そこで、アーク溶接開始時には、シールドガス、一般的にはアルゴンガスを用いて、電極とワークとの周囲にアルゴン雰囲気を形成した後、このアルゴンガス雰囲気内でアーク溶接を行っている。このアーク溶接の一種としてＴＩＧ溶接を挙げることができる。ＴＩＧ溶接は、被溶接物とタングステンからなる電極の間にアークを発生させてその熱で溶接を行う方法である。この場合、アルゴンからなるシールドガスを溶接時に噴射し、大気を遮断して被溶接物の変色酸化を防ぐ。このＴＩＧ溶接によれば非接触状態でアークを飛ばすために、被溶接物と電極の位置が多少ずれても溶接が可能であり、特に端子形状の溶接に有効である。 Conventionally, when air is in contact with molten metal during arc welding, nitrogen in the atmosphere dissolves in the metal, and when the molten metal solidifies, the dissolved nitrogen precipitates all at once and remains in the form of bubbles. It is known that the molten metal solidifies and becomes a blowhole state. Therefore, at the start of arc welding, an argon atmosphere is formed around the electrode and the work using a shielding gas, generally argon gas, and then arc welding is performed in the argon gas atmosphere. One type of arc welding is TIG welding. TIG welding is a method in which an arc is generated between an object to be welded and an electrode made of tungsten, and welding is performed with the heat. In this case, a shielding gas composed of argon is injected at the time of welding to block the atmosphere and prevent discoloration oxidation of the workpiece. According to this TIG welding, since the arc is blown in a non-contact state, welding is possible even if the position of the work piece and the electrode is slightly shifted, and this is particularly effective for terminal-shaped welding.
　ところで、実開昭５８－７６３８８号公報には、アーク溶接時にトーチノズルの先端部にスパッタが堆積するのを防止するために、トーチノズルの先端内周面にセラミック層を形成する技術的思想が開示されている。また、特開２００３－２９０９３０号公報には、ブローホール等により溶接の品質が低下することを回避するために、シールドガス噴出口の周囲に絶縁性と耐熱性とを備えた繊維質材料で形成されたフィルタを設ける技術的思想が開示されている。特開２００５－２２４８４９号公報には、プラズマ溶接時に導電性のノズルと被溶接部材とが接触すると該プラズマノズルと電極との間でアークが発生することに鑑み、プラズマノズルの先端にガイド部材を取り付け、プラズマノズルと被溶接部材との接触を回避する技術的思想が開示されている。 Japanese Utility Model Publication No. 58-76388 discloses a technical idea of forming a ceramic layer on the inner peripheral surface of the tip of the torch nozzle in order to prevent spatter from being deposited on the tip of the torch nozzle during arc welding. ing. In addition, JP 2003-290930 A discloses a fiber material having insulation and heat resistance around a shield gas outlet in order to avoid deterioration in welding quality due to blow holes or the like. A technical idea of providing such a filter is disclosed. In Japanese Patent Application Laid-Open No. 2005-224849, in view of the fact that an arc is generated between the plasma nozzle and the electrode when the conductive nozzle and the member to be welded contact during plasma welding, a guide member is provided at the tip of the plasma nozzle. The technical idea of avoiding attachment and contact between the plasma nozzle and the member to be welded is disclosed.
　しかしながら、連続的にアーク溶接作業を続行したり、また、場合によってはワーク形状に基因してアルゴンガス内に空気を巻き込むことがしばしば惹起する。この結果、アークが失火し、溶接作業が中断されるという不具合がみられる。また、アークが失火した場合、溶接電極側で印加電圧を大きくし、再度、初期アークを発生させようとの試みがなされる。そして、この場合、初期アークの発生に失敗すると徐々に印加電圧を高めていく。そこで、電圧をさらに大きくしリスタートを繰り返すと、アーク溶接装置に内蔵されている高電圧発生回路に過大な負荷がかかり、最終的には前記高電圧発生回路に故障を来たすという懸念がある。しかも、前記の如き高電圧発生回路を設けること自体、装置全体としての製造コストを上昇させる不都合がある。 However, it is often caused that the arc welding operation is continued continuously, or in some cases, air is involved in the argon gas due to the workpiece shape. As a result, there is a problem that the arc is misfired and the welding operation is interrupted. When the arc is misfired, an attempt is made to increase the applied voltage on the welding electrode side and generate an initial arc again. In this case, when the generation of the initial arc fails, the applied voltage is gradually increased. Therefore, when the voltage is further increased and the restart is repeated, there is a concern that an excessive load is applied to the high voltage generation circuit built in the arc welding apparatus, and eventually the high voltage generation circuit is damaged. In addition, the provision of such a high voltage generation circuit itself has the disadvantage of increasing the manufacturing cost of the entire device.
　本発明は上記した問題を解決するためになされたもので、アーク溶接時に可及的に失火を防止し、簡単な構造で、連続的にアークを発生させることができると共に、溶接装置全体としての製造コストを低廉化することが可能なアーク溶接用トーチを提供することを目的とする。 The present invention has been made to solve the above-described problems, and prevents misfire as much as possible at the time of arc welding, can continuously generate an arc with a simple structure, and as a whole welding apparatus. An object of the present invention is to provide an arc welding torch capable of reducing the manufacturing cost.
　前記の目的を達成するために、本発明に係るアーク溶接用トーチは、トーチボディと、前記トーチボディの軸中心部に設けられる電極と、前記電極を把持するコレットと、前記コレットを囲繞するコレットボディと、前記トーチボディの先端部に設けられ、前記電極を挿通するトーチノズルと、を有し、前記トーチノズルの内周面に、導電性部材が装着されていることを特徴とする。 In order to achieve the above object, an arc welding torch according to the present invention includes a torch body, an electrode provided at an axial center portion of the torch body, a collet holding the electrode, and a collet surrounding the collet. It has a body and a torch nozzle provided at the tip of the torch body and through which the electrode is inserted, and a conductive member is mounted on the inner peripheral surface of the torch nozzle.
　この場合、前記導電性部材が前記電極を囲繞してもよい。 In this case, the conductive member may surround the electrode.
　また、トーチノズルをトーチボディ側から前記電極先端に指向して断面を徐々に縮径し、前記導電性部材を該縮径する該トーチノズルの内周面に装着すると、該導電性部材の安定した取付効果が得られる。 Further, when the torch nozzle is gradually reduced in diameter from the torch body side toward the tip of the electrode and the conductive member is attached to the inner peripheral surface of the torch nozzle to reduce the diameter, the conductive member can be stably attached. An effect is obtained.
　さらに、導電性部材は、金属製メッシュ又は金属製板であってもよい。なお、本発明において、前記金属製板は板厚が０．１ｍｍ未満のものを含む。前記金属製メッシュ及び前記金属製板は、ＳＵＳ、銅、銅合金、アルミニウム、及びアルミニウム合金のうちのいずれか１の金属で構成されていてもよい。 Furthermore, the conductive member may be a metal mesh or a metal plate. In the present invention, the metal plate includes one having a plate thickness of less than 0.1 mm. The metal mesh and the metal plate may be made of any one of SUS, copper, copper alloy, aluminum, and aluminum alloy.
　また、本発明のアーク溶接用トーチをＴＩＧ溶接に用いると、アークの失火が抑制され、一層好適である。 Further, when the arc welding torch of the present invention is used for TIG welding, arc misfire is suppressed, which is more preferable.
　これにより、アーク溶接時における失火を防止することが可能となる。またアーク発生時の失火を可及的に回避するため、初期アークを発生させるべく所定電圧の印加を繰り返す必要がなくなり、溶接の生産効率を向上させることができる。さらに、初期アーク電圧を低く抑えることができるため、高電圧発生回路を不要とし、あるいは、備えていたとしても該高電圧発生回路への負荷が小さくなり、溶接装置全体としての寿命を延ばすことが可能となる。 This makes it possible to prevent misfire during arc welding. Moreover, in order to avoid misfire at the time of arc generation as much as possible, it is not necessary to repeat application of a predetermined voltage to generate an initial arc, and the production efficiency of welding can be improved. Furthermore, since the initial arc voltage can be kept low, the high voltage generating circuit is not required or even if it is provided, the load on the high voltage generating circuit is reduced, and the life of the entire welding apparatus can be extended. It becomes possible.
本発明の第１実施形態に係るアーク溶接用トーチの要部断面説明図である。It is principal part cross-sectional explanatory drawing of the arc welding torch concerning 1st Embodiment of this invention. 図１に示すアーク溶接用トーチを用いてアーク溶接を行っている状態の説明図である。It is explanatory drawing of the state which is performing arc welding using the torch for arc welding shown in FIG. アーク溶接用トーチにおいて金属製メッシュの有無に対する初期アーク電圧波形図である。It is an initial stage arc voltage waveform figure with respect to the presence or absence of metal meshes in the arc welding torch. 本発明の第２実施形態に係るアーク溶接用トーチの要部断面説明図である。It is principal part cross-sectional explanatory drawing of the arc welding torch concerning 2nd Embodiment of this invention. 実施例１においてアーク溶接用トーチを用いてアーク溶接を行っている状態のアルゴンガスとアーク電流の関係を示すグラフである。It is a graph which shows the relationship between the argon gas of the state which is performing the arc welding using the arc welding torch in Example 1, and an arc current. 実施例２に係る実験装置の要部ブロック図である。FIG. 4 is a block diagram of a main part of an experimental apparatus according to Example 2. 実施例２においてアーク電流の時間に対する変化を示すグラフである。6 is a graph showing changes of arc current with respect to time in Example 2. 導電性部材を備えたアーク溶接用トーチを用いてアーク放電を繰り返し行った場合の放電回数及び失火の有無を示す実験結果と導電性部材を備えていないアーク溶接用トーチを用いてアーク放電を繰り返し行った場合の放電回数及び失火の有無を示す実験結果である。Experimental results showing the number of discharges and the presence or absence of misfire when arc discharge is repeatedly performed using an arc welding torch equipped with a conductive member, and arc discharge using an arc welding torch without a conductive member It is an experimental result which shows the frequency | count of discharge at the time of performing, and the presence or absence of misfire.
　以下、本発明に係るアーク溶接用トーチについて好適な実施形態を挙げ、添付の図面を参照して詳細に説明する。 Hereinafter, preferred embodiments of the arc welding torch according to the present invention will be described in detail with reference to the accompanying drawings.
（第１実施形態）
　先ず、本発明の第１実施形態に係るアーク溶接用トーチについて図１～図３を示しながら説明する。図１に示すように、溶接トーチ１０は、トーチボディ１６を有し、前記トーチボディ１６は、軸中心部に設けられた電極１８と、コレット２０を有する。前記コレット２０はコレットボディ２２によって囲繞され、前記コレットボディ２２はトーチノズル２４と螺合する。 (First embodiment)
First, an arc welding torch according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the welding torch 10 has a torch body 16, and the torch body 16 has an electrode 18 provided at the center of the shaft and a collet 20. The collet 20 is surrounded by a collet body 22, and the collet body 22 is screwed with a torch nozzle 24.
　前記電極１８は、コレット２０により把持され、その先端部は後述するようにトーチノズル２４より若干外部に露呈する。 The electrode 18 is gripped by the collet 20, and its tip is slightly exposed to the outside from the torch nozzle 24 as will be described later.
　前記コレットボディ２２には、シールドガス（本実施形態では、アルゴンガス）を電極１８とトーチノズル２４との間に形成された空間部２６に導出させる複数のガス導出孔２８が形成される。トーチノズル２４は、好ましくは、アルミナ製である。 The collet body 22 is formed with a plurality of gas outlet holes 28 for leading shield gas (argon gas in the present embodiment) to the space 26 formed between the electrode 18 and the torch nozzle 24. The torch nozzle 24 is preferably made of alumina.
　前記トーチノズル２４はトーチボディ１６側が大径な基部側として、前記電極１８の先端側に指向してなだらかな肩部を経て先端部分が狭径の円筒状に形成され、すなわち、先端部分の外径を細くして絞り込む形状である。該トーチノズル２４の先端中央部は同径で所定距離延在する開口部３０として形成され、前記開口部３０に電極１８が挿通され、且つその先端部が該開口部３０より突出している。このトーチノズル２４の内周面３２には、丁度トーチノズル２４が徐々に絞られる前記肩部内部に適合するように導電性部材３４が前記電極１８の基端部側を囲繞するように周回して装着される。 The torch nozzle 24 has a large-diameter base side on the torch body 16 side, and is formed in a cylindrical shape with a narrow diameter through a gentle shoulder toward the tip side of the electrode 18, that is, the outer diameter of the tip part. The shape is narrowed down to narrow down. The central portion of the tip of the torch nozzle 24 is formed as an opening 30 having the same diameter and extending a predetermined distance. The electrode 18 is inserted into the opening 30 and the tip protrudes from the opening 30. On the inner peripheral surface 32 of the torch nozzle 24, a conductive member 34 is mounted so as to surround the base end side of the electrode 18 so as to fit inside the shoulder portion where the torch nozzle 24 is gradually throttled. Is done.
　なお、導電性部材３４は、トーチノズル２４の内周面３２のうち肩部以外の位置に装着してもよい。例えば、肩部より電極１８の後端側（すなわち、トーチノズルの基部側）における内周面３２の径が略一定の位置に装着してもよい。こうすれば、トーチノズル２４の径が徐々に絞られる肩部に装着する場合に比べて、導電性部材３４を容易に装着することができる。 The conductive member 34 may be attached to a position other than the shoulder portion on the inner peripheral surface 32 of the torch nozzle 24. For example, the diameter of the inner peripheral surface 32 on the rear end side of the electrode 18 from the shoulder portion (that is, the base portion side of the torch nozzle) may be mounted at a substantially constant position. In this way, the conductive member 34 can be easily attached as compared with the case where the torch nozzle 24 is attached to the shoulder portion where the diameter is gradually reduced.
　また、導電性部材３４は、メッシュ状に形成されるとともに、例えば、ステンレス鋼（ＳＵＳ）、銅、銅合金、アルミニウム、及びアルミニウム合金のうちのいずれか１の金属で構成されている。銅合金としては、例えば、真鍮を利用することができる。 Further, the conductive member 34 is formed in a mesh shape and is made of any one metal of, for example, stainless steel (SUS), copper, copper alloy, aluminum, and aluminum alloy. As the copper alloy, for example, brass can be used.
　また、導電性部材３４のトーチノズル２４の内周面３２への装着は、導電性部材３４及びトーチノズル２４の間に生じる摩擦力だけでなく接着剤等を利用してもよい。なお、シールドガスとして、アルゴンガスでなく、二酸化炭素やヘリウム等を用いてもよい。 Also, the conductive member 34 may be attached to the inner peripheral surface 32 of the torch nozzle 24 using not only the frictional force generated between the conductive member 34 and the torch nozzle 24 but also an adhesive. Note that carbon dioxide, helium, or the like may be used as the shielding gas instead of argon gas.
　本発明の第１実施形態に係る溶接トーチ１０は、基本的には以上のように構成されるものであり、次にその動作並びに作用効果について説明する。 The welding torch 10 according to the first embodiment of the present invention is basically configured as described above. Next, the operation, action, and effect will be described.
　図２に示すように、正面Ｌ字状のワークＷ1とＷ2とを互いに背中合わせにして所定の位置に配設し、該ワークＷ1とＷ2とが接する溶接部位４２に、溶接トーチ１０の電極１８を所定距離接近させる。好ましくはこの距離は５ｍｍである。 As shown in FIG. 2, the front L-shaped workpieces W 1 and W 2 are arranged back to back at a predetermined position, and a welding torch 10 is attached to a welding site 42 where the workpieces W 1 and W 2 are in contact with each other. The electrodes 18 are moved closer to each other by a predetermined distance. Preferably this distance is 5 mm.
　次いで、溶接トーチ１０へ所定の電流及びアルゴンガスの供給を開始し、溶接部位４２と電極１８との間に、アーク放電が発生しているアーク形成空間４４を形成する。前記アーク形成空間４４の形成後、ＴＩＧ溶接作業を実施し、前記ワークＷの溶接部位４２を形成する。 Next, supply of a predetermined current and argon gas to the welding torch 10 is started, and an arc forming space 44 in which arc discharge is generated is formed between the welding portion 42 and the electrode 18. After the arc forming space 44 is formed, a TIG welding operation is performed to form a welded portion 42 of the workpiece W.
　この場合、溶接トーチ１０はＴＩＧ溶接作業を連続して実施したとしても、失火することはなく、確実にアーク形成空間４４を形成し、大気と良好な遮断状態を得てＴＩＧ溶接作業を連続実施することができる。その理由として、以下のことが考えられる。すなわち、従来技術では、溶接開始時には電極の先端部からアークが発生するが、溶接回数を重ねるごとにアークの発生位置が電極の先端から這い上がっていく現象が見られる。これは、電極の酸化等の影響によるものと考えられる。そして、アーク発生位置が電極先端部から這い上がっていくことは、アーク発生位置がワークから遠ざかって行くことを意味する。換言すれば、ワークからアーク発生位置までの距離が長くなると、初期アーク電圧が徐々に高電圧になり、失火が頻発するに至る。 In this case, the welding torch 10 does not misfire even if the TIG welding operation is continuously performed, and the arc forming space 44 is surely formed, and the TIG welding operation is continuously performed by obtaining a good shielding state from the atmosphere. can do. The reason can be considered as follows. That is, in the prior art, an arc is generated from the tip of the electrode at the start of welding, but there is a phenomenon that the arc generation position rises from the tip of the electrode as the number of weldings is repeated. This is considered to be due to the influence of electrode oxidation and the like. The fact that the arc generation position climbs up from the tip of the electrode means that the arc generation position moves away from the workpiece. In other words, as the distance from the workpiece to the arc generation position becomes longer, the initial arc voltage gradually becomes higher and misfires occur frequently.
　アークの位置が這い上がる、つまり、電極の先端部でアークが発生しなくなる理由として、酸化等の影響で「電離電圧」が上がることが考えられる。ここで「電離」とは、原子に励起状態よりもっと大きなエネルギーを外部から加えると、電子が原子から飛び出すことをいい、この電離に必要な最低電圧を「電離電圧」という。プラズマを発生させるには電離電圧以上のエネルギーを加えないとならないので、アーク溶接を連続して行う場合において、初期アークの失火を回避すべく、徐々に電極に印加される電圧を上昇させる、すなわち、電離電圧を上昇させることは、プラズマを発生させることが困難な状況があることを前提とし、失火の頻度が高いことを意味する。 The reason why the position of the arc rises, that is, the reason why the arc does not occur at the tip of the electrode is that the “ionization voltage” is increased due to the influence of oxidation or the like. Here, “ionization” means that electrons are ejected from an atom when an energy larger than the excited state is applied to the atom from the outside, and the minimum voltage required for this ionization is called “ionization voltage”. In order to generate plasma, energy higher than the ionization voltage must be applied. Therefore, when arc welding is continuously performed, the voltage applied to the electrodes is gradually increased in order to avoid misfiring of the initial arc, that is, Raising the ionization voltage means that the frequency of misfires is high on the premise that there is a situation where it is difficult to generate plasma.
　ところで、従来技術のようにトーチノズル２４の内周面３２に導電性部材３４を装着していない溶接トーチを用いて連続してＴＩＧ溶接作業を実施すると、電極が酸化して、徐々に失火が発生しやすくなる。失火した場合、初期アーク電圧を徐々に大きくし、アーク形成空間４４の形成を再度実施する。そして、失火を繰り返すと、いずれ初期アーク電圧が高電圧発生回路が許容する最大電圧を印加しても失火するようになり、最終的にはＴＩＧ溶接作業を中断し、電極先端の研磨等の作業が必要となる。 By the way, when the TIG welding operation is continuously performed using a welding torch in which the conductive member 34 is not attached to the inner peripheral surface 32 of the torch nozzle 24 as in the prior art, the electrode is oxidized and gradually misfires are generated. It becomes easy to do. When a misfire occurs, the initial arc voltage is gradually increased, and the arc formation space 44 is formed again. If the misfire is repeated, the initial arc voltage will eventually become misfired even if the maximum voltage allowed by the high voltage generation circuit is applied. Finally, the TIG welding operation is interrupted and the work such as polishing of the electrode tip is performed. Is required.
　一方、本実施形態のようにトーチノズル２４の内周面３２に導電性部材３４を装着することにより、連続してＴＩＧ溶接作業を実施したとしても、失火することがほとんどないことが実験により確認された。 On the other hand, by attaching the conductive member 34 to the inner peripheral surface 32 of the torch nozzle 24 as in this embodiment, it is confirmed by experiments that even if TIG welding work is continuously performed, there is almost no misfire. It was.
　このように、初期アーク電圧を小さくすることができるため、溶接トーチ１０やそれを組み込むＴＩＧ溶接機への負荷を低減することができる。従って、高電圧発生回路の故障が発生しにくくなり、ＴＩＧ溶接作業が中断することが少なくなるために、アーク溶接の生産効率が向上する。また、場合によって、前記高電圧発生回路をＴＩＧ溶接機に組み込まなくてもよい。 Thus, since the initial arc voltage can be reduced, the load on the welding torch 10 and the TIG welding machine incorporating it can be reduced. Therefore, it becomes difficult for the failure of the high voltage generation circuit to occur and the TIG welding operation is less interrupted, so that the production efficiency of arc welding is improved. In some cases, the high voltage generation circuit may not be incorporated into the TIG welder.
　図３は、導電性部材３４の有無に対する初期アーク電圧波形図である。図３中に示される実線Ａは、本実施形態に係るトーチノズル２４の内周面３２に金属製メッシュで構成された導電性部材３４を組み込んだ溶接トーチ１０の初期アーク電圧波形を示し、破線ａは、該導電性部材３４を装着していないＴＩＧ溶接装置の初期アーク電圧波形を示している。ここで、初期アーク電圧とは、前記アーク形成空間４４を形成するために必要な電圧の最小値である。なお、図３中の縦軸に示す電圧はマイナス方向へ大となる。図３から容易に諒解されるように、本実施形態によれば、導電性部材３４を組み込んだ溶接トーチ１０は約６２００Ｖ前後で初期アーク電圧が得られるが、導電性部材３４を備えていない従来技術の溶接トーチでは約１１５００Ｖが初期アーク電圧である。 FIG. 3 is an initial arc voltage waveform diagram with respect to the presence or absence of the conductive member 34. A solid line A shown in FIG. 3 shows an initial arc voltage waveform of the welding torch 10 in which the conductive member 34 made of a metal mesh is incorporated on the inner peripheral surface 32 of the torch nozzle 24 according to the present embodiment, and a broken line a These show the initial arc voltage waveform of the TIG welding apparatus not equipped with the conductive member 34. Here, the initial arc voltage is a minimum value of a voltage necessary for forming the arc forming space 44. Note that the voltage shown on the vertical axis in FIG. 3 increases in the negative direction. As can be easily understood from FIG. 3, according to the present embodiment, the welding torch 10 incorporating the conductive member 34 can obtain an initial arc voltage around 6200 V, but does not include the conductive member 34. In the art welding torch, about 11500V is the initial arc voltage.
（第２実施形態）
　次に、本発明の第２実施形態に係るアーク溶接用トーチについて図４を参照しながら説明する。なお、第２実施形態では、第１実施形態と共通する構成には同一の参照符号を付して説明を省略する。 (Second Embodiment)
Next, an arc welding torch according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the same reference numerals are given to the same components as those in the first embodiment, and description thereof will be omitted.
　第２実施形態は、導電性部材１３４の構成が第１実施形態と異なっている。具体的には、導電性部材１３４は、板状（薄板状）又は箔状に形成されており、例えば、ＳＵＳ、銅、銅合金、アルミニウム、及びアルミニウム合金等のうちのいずれか１の金属から構成されている。銅合金としては、例えば、真鍮を利用することができる。導電性部材１３４の厚みは、シールドガスがトーチノズル２４内を充分に流通できる程度の大きさに設定されている。また、導電性部材１３４の厚みは、０．１ｍｍ未満に設定することもできる。 2nd Embodiment differs in the structure of the electroconductive member 134 from 1st Embodiment. Specifically, the conductive member 134 is formed in a plate shape (thin plate shape) or a foil shape. For example, the conductive member 134 is made of any one of SUS, copper, copper alloy, aluminum, and aluminum alloy. It is configured. As the copper alloy, for example, brass can be used. The thickness of the conductive member 134 is set to such a size that the shield gas can sufficiently flow through the torch nozzle 24. Further, the thickness of the conductive member 134 can be set to less than 0.1 mm.
　第２実施形態によれば、溶接トーチ１００の導電性部材１３４に、金属製板又は金属製箔を用いているので、第１実施形態と同様の効果を奏する。 According to the second embodiment, since the metal plate or the metal foil is used for the conductive member 134 of the welding torch 100, the same effects as those of the first embodiment are obtained.
　本発明に係るアーク溶接用トーチは、上述した実施形態に限らず、本発明の要旨を逸脱することなく、種々の構成を採り得ることはもちろんである。例えば、導電性部材は、コイルばね状に形成してもよい。 Of course, the arc welding torch according to the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention. For example, the conductive member may be formed in a coil spring shape.
　また、本発明は、トーチノズルの内周面にアルミニウム等の金属を蒸着したり、被覆したりすることにより、前記トーチノズルへの導電性部材の装着を実現してもよい。これにより、該導電性部材が該トーチノズルから外れる懸念を排除することができる。この場合、前記トーチノズルを前記導電性部材の装着し易い形状にしなくてもよくなる。そのため、前記トーチノズルの設計自由度が増加する。 In the present invention, the conductive member may be mounted on the torch nozzle by depositing or coating a metal such as aluminum on the inner peripheral surface of the torch nozzle. Thereby, the concern that the conductive member is detached from the torch nozzle can be eliminated. In this case, the torch nozzle need not have a shape that facilitates mounting of the conductive member. Therefore, the design freedom of the torch nozzle increases.
　以下に、本発明の実施例を挙げて本発明をさらに具体的に説明する。 Hereinafter, the present invention will be described in more detail with reference to examples of the present invention.
　先ず、実施例１について説明する。本実施例では、上述した第１実施形態のように構成されるアーク溶接用トーチを用いてＴＩＧ溶接を行った。つまり、本実施例では、導電性部材に金属製メッシュを用いている。 First, Example 1 will be described. In this example, TIG welding was performed using an arc welding torch configured as in the first embodiment described above. That is, in this embodiment, a metal mesh is used for the conductive member.
　被溶接物として銅板を選択し、電極はランタン１．５重量％を含有するタングステン電極（φ２．５ｍｍ）を用いた。図５に示すように、アルゴンガスをシールドガスとして１分間あたり６リットル流した。このアルゴンガスのプレパージ時間は２秒であった。アルゴンガスを流してから２秒後に電極に溶接電流１００Ａを流した。溶接電流を電極に流し始め、終了するまでの時間は１００ミリ秒であった。その後のアルゴンガスのポストパージ時間は２秒であった。因みに溶接タクト時間は５秒に１回であった。 A copper plate was selected as the work piece, and a tungsten electrode (φ2.5 mm) containing 1.5% by weight of lanthanum was used as the electrode. As shown in FIG. 5, 6 liters per minute was flowed using argon gas as a shielding gas. The argon gas pre-purge time was 2 seconds. Two seconds after flowing argon gas, a welding current of 100 A was passed through the electrode. The time until the welding current started to flow through the electrode and ended was 100 milliseconds. The subsequent argon gas post-purge time was 2 seconds. Incidentally, the welding tact time was once every 5 seconds.
　溶接結果は以下の通りである。すなわち、約２時間（１４４０回）の溶接において失火は０回であった。また溶接電源に設定されているリトライスタート動作（失火発生時に溶接電源から再スタートする機能）は一度も動作しなかった。このことより本アーク溶接用トーチは失火に対して極めて効果的であることが判明した。 The welding results are as follows. That is, the number of misfires was zero in welding for about 2 hours (1440 times). Also, the retry start operation set for the welding power source (the function to restart from the welding power source when a misfire occurs) never worked. This indicates that the arc welding torch is extremely effective against misfire.
　従来の方法では、すなわち、金属製メッシュを組み込まない構造のものでは、２００回を過ぎたあたりから失火がたまに発生し、３００回を過ぎると顕著に失火していた。その際は電極の先端部を研磨する方法がとられていた。本実施例のように、トーチノズルに金属製メッシュを装着することにより、電極の研磨回数は２００回に１回から１５００回に１回となり電極の寿命も延ばすことができる。 In the conventional method, that is, in the case of a structure in which a metal mesh is not incorporated, misfires occasionally occur after about 200 times, and after about 300 times, misfires are remarkably misfired. At that time, a method of polishing the tip of the electrode was used. By attaching a metal mesh to the torch nozzle as in this embodiment, the number of polishing of the electrode can be increased from 1 to 200 times to 1500 times, thereby extending the life of the electrodes.
　また、前記のように金属製メッシュを装着することにより、初期アーク電圧も低く抑えられるため、高電圧発生回路の負担が小さくなり溶接電源の寿命も増える特有の効果が得られた。 Also, by attaching the metal mesh as described above, the initial arc voltage can be kept low, so that a specific effect that the burden on the high voltage generation circuit is reduced and the life of the welding power source is increased can be obtained.
（実験装置の構成）
　次に、実施例２について説明する。図６に示すように、本実施例の実験装置２００は、溶接電源（ＰＵＬＳＥＴＩＧ電源　ＭＡＷ－３００Ａ　ＤＣ　高電圧スタート式：ミヤチテクノス製）２０２と、溶接電源２０２の一方の端子２０４に接続された溶接トーチ（ＴＡ－２３ＳＳＰ：ミヤチテクノス製）２０６と、溶接トーチ２０６にシールドガス（アルゴンガス）を供給するガス供給部２０８と、溶接電源２０２の他方の端子２１０に接続されてタフピッチ銅からなるワーク２１２を備えている。 (Configuration of experimental equipment)
Next, Example 2 will be described. As shown in FIG. 6, the experimental apparatus 200 of the present example includes a welding power source (PULSETIG power source MAW-300A DC high voltage start type: manufactured by Miyachi Technos) 202 and a welding power source connected to one terminal 204 of the welding power source 202. A torch (TA-23SSP: manufactured by Miyachi Technos) 206, a gas supply unit 208 for supplying a shielding gas (argon gas) to the welding torch 206, and a work 212 made of tough pitch copper connected to the other terminal 210 of the welding power source 202. It has.
　溶接トーチ２０６は、基本的には上述した第１実施形態の溶接トーチ１０と同じ構成であり、トーチボディ２１４、トリウムを１．５重量％含有するタングステンからなる電極（φ１．６ｍｍ）２１６、トーチノズル２１８、及び導電性部材２２０等を有している。 The welding torch 206 has basically the same configuration as the welding torch 10 of the first embodiment described above, a torch body 214, an electrode (φ1.6 mm) 216 made of tungsten containing 1.5% by weight of thorium, and a torch nozzle. 218, a conductive member 220, and the like.
　電極２１６は、先端研磨角度が４０°に設定されるとともにトーチノズル２１８からの突出長さ（Ｌ１）が２ｍｍになるようにトーチボディ２１４に取り付けられている。また、溶接トーチ２０６は、ワーク２１２表面と電極２１６先端との間の距離（Ｌ２）が１ｍｍになるように不図示の支持部材にて固定されている。 The electrode 216 is attached to the torch body 214 so that the tip polishing angle is set to 40 ° and the protruding length (L1) from the torch nozzle 218 is 2 mm. The welding torch 206 is fixed by a support member (not shown) so that the distance (L2) between the surface of the workpiece 212 and the tip of the electrode 216 is 1 mm.
　なお、溶接トーチ２０６及びワーク２１２は、電極２１６が陰極、ワーク２１２が陽極となるように溶接電源２０２の各端子２０４、２１０にそれぞれ接続されている。 The welding torch 206 and the workpiece 212 are connected to the terminals 204 and 210 of the welding power source 202 so that the electrode 216 is a cathode and the workpiece 212 is an anode.
（実験条件）
　次に、本実施例に係る実験条件について説明する。本実施例では、導電性部材２２０として、ＳＵＳメッシュ（厚み０．１４ｍｍ）、銅メッシュ（厚み０．３ｍｍ）、真鍮メッシュ（厚み０．３ｍｍ）、銅板（厚み０．１４ｍｍ）、真鍮板（厚み０．１ｍｍ）、及びアルミニウム箔（アルミ箔）（厚み０．０１ｍｍ）の６種類を選択した。なお、本実施例では、ＪＩＳ規格（ＪＩＳ　Ｈ　０５００）に従って、導電性部材２２０の厚みが０．１ｍｍ以上のものを板と称し、０．１ｍｍ未満のものを箔と称している。 (Experimental conditions)
Next, experimental conditions according to the present example will be described. In this embodiment, as the conductive member 220, SUS mesh (thickness 0.14 mm), copper mesh (thickness 0.3 mm), brass mesh (thickness 0.3 mm), copper plate (thickness 0.14 mm), brass plate (thickness) 0.1 mm) and six types of aluminum foil (aluminum foil) (thickness 0.01 mm) were selected. In this embodiment, according to the JIS standard (JIS H 0500), the conductive member 220 having a thickness of 0.1 mm or more is referred to as a plate, and the one having a thickness of less than 0.1 mm is referred to as a foil.
　溶接電流は、図７に示すグラフのように制御した。具体的には、スタート電流を２０Ａに、アップスロープ時間を２０ミリ秒に、溶接電流を３０Ａに、溶接時間を５０ミリ秒に、それぞれ設定した。なお、本実施例では、ダウンスロープ制御は行わず、溶接タクト時間は３秒に１回であった。また、シールドガスの流量は、１分間あたり３リットル流した。 The welding current was controlled as shown in the graph in FIG. Specifically, the start current was set to 20 A, the upslope time was set to 20 milliseconds, the welding current was set to 30 A, and the welding time was set to 50 milliseconds. In this example, downslope control was not performed, and the welding tact time was once every 3 seconds. The flow rate of the shielding gas was 3 liters per minute.
（測定方法）
　本実施例では、上述した６種類の導電性部材２２０のそれぞれに対して、上記溶接条件に従ってアークを発生させた際の放電回数及び失火の有無を３セット測定した。なお、本実施例では、実験開始後、最初のアークの失火時点を本実施例のアークの失火とした。つまり、アークのリスタートは行わなかった。また、各セットの実験開始前に、不図示の電極研磨機にてその先端研磨角度が４０°となるように電極２１６を研磨した。 (Measuring method)
In this example, for each of the six types of conductive members 220 described above, three sets of the number of discharges and the presence or absence of misfiring when an arc was generated in accordance with the welding conditions were measured. In this example, the first arc misfire after the start of the experiment was regarded as the arc misfire of this example. In other words, the arc was not restarted. Further, before the start of each set of experiments, the electrode 216 was polished by an electrode polishing machine (not shown) so that the tip polishing angle was 40 °.
　アーク放電回数の上限は、基本的に１セットあたり１５００回とした。但し、ＳＵＳメッシュについては、３セット目だけ２１００回をアーク放電回数の上限とした（図８参照）。 The upper limit of the number of arc discharges was basically 1500 times per set. However, for the SUS mesh, the upper limit of the number of arc discharges was 2100 times for the third set (see FIG. 8).
（比較例）
　次に、比較例について説明する。比較例は、本実施例の実験装置２００において、導電性部材２２０を省略したものを使用した。また、実験条件及び測定方法は、本実施例と同じとした。 (Comparative example)
Next, a comparative example will be described. The comparative example used the experimental apparatus 200 of the present example in which the conductive member 220 is omitted. The experimental conditions and measurement method were the same as in this example.
（実験結果）
　本実施例及び比較例の実験結果について図８を参照しながら説明する。図８に示すように、比較例では、４４回、３６回、６１回でそれぞれ失火しているのに対して、実施例２では、アルミ箔の１セット目及び２セット目以外において、１５００回の連続放電ができ、その間の失火はなかった。また、ＳＵＳメッシュの３セット目については、２１００回の連続放電ができ、その間の失火はなかった。アルミ箔については、９０２回、１３０２回でそれぞれ失火することがあったが、比較例と比べて、少なくとも２０倍以上の回数の連続放電ができた。 (Experimental result)
The experimental results of this example and the comparative example will be described with reference to FIG. As shown in FIG. 8, in the comparative example, misfires occurred at 44 times, 36 times, and 61 times, respectively, whereas in Example 2, 1500 times except for the first set and the second set of aluminum foil. There was no misfire during that time. Moreover, about the 3rd set of SUS mesh, 2100 times of continuous discharge was possible, and there was no misfire in the meantime. The aluminum foil sometimes misfired at 902 times and 1302 times, but continuous discharge was performed at least 20 times as many times as the comparative example.
　このように、トーチノズル２１８に導電性部材２２０を装着することにより、失火の発生度合いが著しく減少することが証明された。特に、ＳＵＳメッシュ、銅メッシュ、真鍮メッシュ、銅板、及び真鍮板においては、失火防止効果が大きいことがわかった。また、アルミ箔においても、比較例と比べて失火防止の顕著な効果を有することがわかった。 Thus, it has been proved that the degree of misfire is significantly reduced by attaching the conductive member 220 to the torch nozzle 218. In particular, it was found that SUS mesh, copper mesh, brass mesh, copper plate, and brass plate have a large misfire prevention effect. Moreover, it turned out that it has a remarkable effect of preventing misfire also in aluminum foil compared with the comparative example.

Claims (8)

  1. 　トーチボディ（１６）と、
    　前記トーチボディ（１６）の軸中心部に設けられる電極（１８）と、
    　前記電極（１８）を把持するコレット（２０）と、
    　前記コレット（２０）を囲繞するコレットボディ（２２）と、
    　前記トーチボディ（２２）の先端部に設けられ、前記電極（１８）を挿通するトーチノズル（２４）と、
    　を有し、
    　前記トーチノズル（２４）の内周面（３２）に、導電性部材（３４）が装着されていることを特徴とするアーク溶接用トーチ。     Torch body (16),
    An electrode (18) provided at the axial center of the torch body (16);
    A collet (20) holding the electrode (18);
    A collet body (22) surrounding the collet (20);
    A torch nozzle (24) provided at the tip of the torch body (22) and passing through the electrode (18);
    Have
    A torch for arc welding, wherein a conductive member (34) is mounted on an inner peripheral surface (32) of the torch nozzle (24).
  2. 　請求項１記載のアーク溶接用トーチにおいて、
    　前記導電性部材（３４）が、前記電極（１８）を囲繞することを特徴とするアーク溶接用トーチ。     The arc welding torch according to claim 1,
    The arc welding torch, wherein the conductive member (34) surrounds the electrode (18).
  3. 　請求項１又は２記載のアーク溶接用トーチにおいて、
    　前記トーチノズル（２４）は前記トーチボディ（２２）側から前記電極（１８）先端に指向して断面が徐々に縮径し、
    　前記導電性部材（３４）は該徐々に縮径する該トーチノズル（２４）の内周面（３２）に設けられていることを特徴とするアーク溶接用トーチ。     In the arc welding torch according to claim 1 or 2,
    The torch nozzle (24) is gradually reduced in diameter from the torch body (22) side toward the tip of the electrode (18),
    The arc welding torch, wherein the conductive member (34) is provided on an inner peripheral surface (32) of the torch nozzle (24) that gradually decreases in diameter.
  4. 　請求項１～３のいずれか１項に記載のアーク溶接用トーチにおいて、
    　前記導電性部材（３４）が金属製メッシュであることを特徴とするアーク溶接用トーチ。     The arc welding torch according to any one of claims 1 to 3,
    The arc welding torch, wherein the conductive member (34) is a metal mesh.
  5. 　請求項４記載のアーク溶接用トーチにおいて、
    　前記金属製メッシュがＳＵＳ、銅、銅合金、アルミニウム、及びアルミニウム合金のうちのいずれか１の金属で構成されていることを特徴とするアーク溶接用トーチ。     The arc welding torch according to claim 4,
    An arc welding torch, wherein the metal mesh is made of any one of SUS, copper, copper alloy, aluminum, and aluminum alloy.
  6. 　請求項１～３のいずれか１項に記載のアーク溶接用トーチにおいて、
    　前記導電性部材（３４）が金属製板であることを特徴とするアーク溶接用トーチ。     The arc welding torch according to any one of claims 1 to 3,
    The arc welding torch, wherein the conductive member (34) is a metal plate.
  7. 　請求項６記載のアーク溶接用トーチにおいて、
    　前記金属製板がＳＵＳ、銅、銅合金、アルミニウム、及びアルミニウム合金のうちのいずれか１の金属で構成されていることを特徴とするアーク溶接用トーチ。     The arc welding torch according to claim 6,
    The arc welding torch, wherein the metal plate is made of any one of SUS, copper, copper alloy, aluminum, and aluminum alloy.
  8. 　請求項１～７のいずれか１項に記載のアーク溶接用トーチにおいて、該アーク溶接用トーチはＴＩＧ溶接に用いられることを特徴とするアーク溶接用トーチ。 The arc welding torch according to any one of claims 1 to 7, wherein the arc welding torch is used for TIG welding.
PCT/JP2009/063923 2008-08-13 2009-08-06 Arc welding torch WO2010018778A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2010524713A JPWO2010018778A1 (en) 2008-08-13 2009-08-06 Arc welding torch
CN200980131477.0A CN102123815B (en) 2008-08-13 2009-08-06 Arc welding torch

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008208675 2008-08-13
JP2008-208675 2008-08-13

Publications (1)

Publication Number Publication Date
WO2010018778A1 true WO2010018778A1 (en) 2010-02-18

Family

ID=41668923

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2009/063923 WO2010018778A1 (en) 2008-08-13 2009-08-06 Arc welding torch

Country Status (3)

Country Link
JP (1) JPWO2010018778A1 (en)
CN (1) CN102123815B (en)
WO (1) WO2010018778A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015174141A (en) * 2014-03-18 2015-10-05 川崎重工業株式会社 welding torch and all position welding equipment

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61148475U (en) * 1985-03-04 1986-09-12
JPS61217567A (en) * 1985-03-20 1986-09-27 Toyota Motor Corp Method for coating contact tip for arc welding with ceramic
JPS62155966U (en) * 1986-03-20 1987-10-03
JPH0395173U (en) * 1990-01-10 1991-09-27
JPH06285645A (en) * 1993-04-05 1994-10-11 Mitsuba Kogyo Kk Contact tip for welding
JP2001150139A (en) * 1999-11-25 2001-06-05 Taihei:Kk Arc stud welding device
JP2002059265A (en) * 2000-05-29 2002-02-26 Daihen Corp Torch for consumable electrode type gas shielded metal arc welding

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2206176Y (en) * 1994-07-30 1995-08-30 北京工业大学科技开发管理部 Argon arc welding automatic welding blow lamp for contacting generating arc
AT413668B (en) * 2003-05-13 2006-04-15 Fronius Int Gmbh GAS NOZZLE FOR A WELDING BURNER AND WELDING BURNER WITH SUCH A GAS SPOUT
JP4391835B2 (en) * 2004-01-15 2009-12-24 株式会社ダイヘン Collet body and TIG welding torch
US6998574B2 (en) * 2004-03-29 2006-02-14 Linclon Global, Inc. Welding torch with plasma assist
CN1299872C (en) * 2004-10-22 2007-02-14 哈尔滨工业大学 Dual tungsten electrodes welding torch in use for argon are welding
AT504253B1 (en) * 2006-10-12 2008-06-15 Fronius Int Gmbh INSERTION ELEMENT, GAS LENS WITH SUCH A INSERT ELEMENT AND WELDING BURNER WITH SUCH A GAS LENS

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61148475U (en) * 1985-03-04 1986-09-12
JPS61217567A (en) * 1985-03-20 1986-09-27 Toyota Motor Corp Method for coating contact tip for arc welding with ceramic
JPS62155966U (en) * 1986-03-20 1987-10-03
JPH0395173U (en) * 1990-01-10 1991-09-27
JPH06285645A (en) * 1993-04-05 1994-10-11 Mitsuba Kogyo Kk Contact tip for welding
JP2001150139A (en) * 1999-11-25 2001-06-05 Taihei:Kk Arc stud welding device
JP2002059265A (en) * 2000-05-29 2002-02-26 Daihen Corp Torch for consumable electrode type gas shielded metal arc welding

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015174141A (en) * 2014-03-18 2015-10-05 川崎重工業株式会社 welding torch and all position welding equipment

Also Published As

Publication number Publication date
CN102123815A (en) 2011-07-13
JPWO2010018778A1 (en) 2012-01-26
CN102123815B (en) 2016-04-13

Similar Documents

Publication Publication Date Title
US10131013B2 (en) Non-transferred plasma arc system, conversion adapter kit, and non-transferred plasma arc torch
WO2014054261A1 (en) Arc welding control method
EP2497597A1 (en) Non-consumable electrode type arc welding apparatus
TWI573653B (en) Welding system using non-consumable electrode and welding method therof
WO2017169899A1 (en) Arc welding control method
WO2018057487A1 (en) Field former for use in welding applications
EP2480367B1 (en) Welding contact tips for pulse applications
KR20060051243A (en) Weld wire electrode for gas metal arc welding
JP5795506B2 (en) Plasma welding method
EP1459830A1 (en) Tig welding equipment and tig welding method
WO2010018778A1 (en) Arc welding torch
JP2008229705A (en) Plasma gma welding torch and plasma gma welding method
KR20120004604U (en) Welding torch having protruded contact tip
KR101846814B1 (en) welding tip
Mannion et al. Plasma arc welding brings better control
JP2003170273A (en) Arc welding method using hollow electrode
US10610954B2 (en) Welding apparatus and plasma welding method
JP2019076929A (en) Arc-welding device and arc-welding method
US20160052078A1 (en) Welding torch with upper and lower shielding gas flow and welding method using welding torch for horizontal welding
JP2017144479A (en) Shield nozzle of gas shield arc welding torch
CN112809137A (en) Welding method of hollow tungsten electrode coaxial MIG/MAG composite welding device
JP2003220472A (en) Nozzle of torch for gas shield arc welding
KR20200119012A (en) Tungsten electrode for TIG welding
JP2020189330A (en) Contact tip
JP2020199547A (en) Shield nozzle for gas shield arc-welding torch

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200980131477.0

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09806670

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2010524713

Country of ref document: JP

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 09806670

Country of ref document: EP

Kind code of ref document: A1