CN102000903B - TIG (tungsten inert gas welding) power assistant double TIG (tungsten inert gas welding) compound heat source welding equipment and method - Google Patents
TIG (tungsten inert gas welding) power assistant double TIG (tungsten inert gas welding) compound heat source welding equipment and method Download PDFInfo
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Abstract
The invention provides a TIG (tungsten inert gas welding) power assistant double TIG (tungsten inert gas welding) compound heat source welding equipment and method, which heats up a welding wire through resistance heat or electric arc heat production at different-droplet transferring patterns to improve the welding wire cladding efficiency. The TIG power assistant double TIG compound heat source welding equipment consists of a main TIG power, a TIG main welding torch, a conducting wire nozzle, an assistant TIG power, a wire feed device and a work piece, wherein the main TIG power is connected with the TIG main welding torch and the work piece respectively, the main TIG power, the TIG main welding torch, a main welding arc and the work piece constitute a main welding loop; the welding method is that leading the assistant TIG power in a routine argon tungsten-arc welding system, connecting two electrodes of the assistant TIG power on the wire feed device and the work piece to form an electric conduction loop, and changing the size of the assistant TIG power electric current in the welding process to form the different-droplet transferring patterns. The invention has simple equipment, low cost, and is convenient to promote in the industrial production.
Description
(1) technical field
The present invention relates to solder technology, is exactly auxiliary double T IG composite heat power supply welding equipment and method of a kind of TIG power supply specifically.
(2) background technology
Argon tungsten-arc welding is because protection gas has been got rid of the infringement of foreign gases such as oxygen, nitrogen, hydrogen to weld metal fully to the reliably protecting in electric arc and molten bath, and welding arc is very stable, can realize high quality welds, obtains good weld seam.But because the restriction of tungsten electrode current carrying capacity, arc power is restricted, and causes speed of welding low, and production efficiency is not high.
Heating wire TIG welding method is on the basis of general T IG weldering, welding wire to be carried out preheating, to improve the sweating heat input quantity, increases burn-off rate, thereby improves speed of welding.Its principle is welding wire to be heated to send into after the uniform temperature among the welding pool again, thereby obtains high deposition rate.In addition, welding wire is purified through pre-heated surface, makes weldquality more good.See from the angle of the hot input quantity of weld seam; The independent respectively control of the energy of welding wire preheating and the energy of welding arc; The raising of welding deposition rate and the increase of the hot input quantity of weld seam directly do not concern; Promptly under the condition that does not improve the heat input, improve the welding deposition rate, welding wire melting rate is increased.Under the situation of same current, speed of welding can be enhanced about more than once.Compare with conventional TIG weldering, the hot wire TIG welding has obviously improved deposition rate, speed of welding, is suitable for welding the Welding Structure of intermediate gauge, has the characteristics of TIG weldering high-quality weld seam simultaneously again.Compare with the MIG weldering, its deposition rate is more or less the same, but hot wire TIG welding's wire feed rate is independent of welding current, therefore can control appearance of weld better, and for bevelled weld seam, its sidewall fusion property is more much better than the MIG weldering.Hot wire TIG welding's method has following two kinds at present:
1, inductance adds heat utilization inductance firing equipment, produces highdensity eddy current at the nearly layer of welding wire surface, thus the heating welding wire, its efficiency of heating surface is high, and speed is fast, and Controllable Temperature property is good, no arc blow effect.But receive certain limitation for the non-ferrous metal heating-up temperature, be applicable to low melting point welding wires such as aluminium alloy.High for the copper alloy welding wire fusing point, rapid heat dissipation, the very high power of heating power supply needs can reach the preheat temperature of technological requirement, thereby this method has certain limitation.
2, arc heated produces heated filament electric arc through introducing small-power TIG welding gun between welding wire and tungsten electrode, utilizes heated filament electric arc, realizes the heating to welding wire, is particularly suitable for having low-resistivity, high-melting-point, and the welding wire of characteristics such as high thermal conductivity coefficient is like copper alloy welding wire.But owing to adopt the TIG arc heated, its energy density is very high, occurs easily melting before welding wire is sent to for the lower material of thermal conductivity factor, destroys normal solder wire convey process.
More than two kinds of methods undesirable in the heated filament effect of material higher for resistivity, that thermal conductivity factor is lower such as pure iron etc.; Greatly limited the application of welding material in high efficiency TIG welding; How to enlarge the selection range of welding wire and realize that high-quality combination with the high efficiency welding has become expansion TIG and has been welded on key in application in the commercial production; Especially more outstanding in some extraordinary field performance, like the high-quality high efficiency built-up welding of pure iron bearing band.
(3) summary of the invention
The object of the present invention is to provide and a kind ofly under different droplet transfer patterns, welding wire is heated, improve the auxiliary double T IG composite heat power supply welding equipment and the method for TIG power supply of welding wire cladding efficient through resistance heat or electric arc heat production.
The objective of the invention is to realize like this: the double T IG composite heat power supply welding equipment that described TIG power supply is auxiliary; It is made up of main TIG power supply, TIG master's welding gun, wire guiding nipple, secondary TIG power supply, wire feeder and workpiece; Main TIG power supply connects TIG master's welding gun and workpiece respectively, and main TIG power supply, TIG master's welding gun, main welding arc and workpiece constitute main welding circuit; Secondary TIG power supply connects wire guiding nipple and workpiece respectively, and wire guiding nipple inside penetrates the welding wire of being sent here by wire feeder, and wire guiding nipple, secondary TIG power supply, workpiece and welding pool constitute the heated filament loop, wire feeder and workpiece insulation.
The welding method that is realized by the auxiliary double T IG composite heat power supply welding equipment of TIG power supply is: in conventional argon tungsten-arc welding system, introduce secondary TIG power supply, two electrodes of secondary TIG power supply are connected on wire feeding mouth and the workpiece formation galvanic circle respectively; Form different droplet transfer modes through the size that changes secondary TIG source current in the welding process, make welding wire under the condition of resistance heat or arc heat or the two coexistence, be heated, adopt secondary TIG power supply assistant heating welding wire; Main TIG power supply and secondary TIG power supply can be dc source or be AC power, or a TIG power supply is that another TIG power supply of dc source is for exchanging the metal material that welding wire selection resistivity is bigger; The welding wire fusing point can be higher or lower than the fusing point of workpiece substrate, and secondary TIG power supply is taked straight polarity direct current, through regulating the size of secondary TIG power supply and main TIG source current; Make double T IG thermal source form matched well; Simultaneously, change the wire feed position of welding wire, change the mode of heated filament and the interim form of molten drop; Secondary TIG source current hour; Motlten metal keeps short-circuit condition, the heated filament loop heat that has a resistance that welding wire is heated on welding wire and the workpiece substrate, and the droplet transfer relies on main arc fusing; When main TIG source current is big, improves welding wire and send the position to, between welding wire end and workpiece, form assistant electric arc, the heat production of assistant electric arc adds the thermosetting molten drop to the welding wire end, under gravity, arc force and low main arc heat, forms the particle transition; Secondary TIG source current is between above-mentioned two kinds of situation the time; Fusing under main arc effect when welding wire is short-circuited; Produce assistant electric arc between welding wire end and the workpiece substrate; Because burn-off rate is lower than wire feed rate, and is short-circuited, the process of arcing, short circuit, fusing so takes place repeatedly.
Double T IG composite heat power supply welding equipment and method that a kind of TIG power supply of the present invention is auxiliary; With respect to traditional T IG technique for overlaying, has following remarkable result: under different droplet transfer patterns, welding wire is heated through resistance heat or electric arc heat production; Significantly improved the cladding efficient of welding wire; Production efficiency is improved, solved the deficiency on traditional TIG built-up welding production efficiency, realized the high-quality and high efficiency combination of argon tungsten-arc welding; Changed and adopted in the TIG arc surfacing process the hot input quantity on the matrix apparently higher than the thermal source distribution characteristics of wire melting heat; The heat distribution of double T IG composite heat power supply is concentrated to the welding wire end; Great amount of heat is used for filler wire; Reduced the fusing amount of workpiece substrate metal, this built-up welding for foreign material is significant.Simultaneously, can also be applied to the built-up welding that the welding wire fusing point is higher than the parent metal fusing point; Adopt double T IG arc composite heat source, alleviated the current carrying capacity of tungsten electrode, improved the service life and the production efficiency of tungsten electrode; Further improved welding quality, under the assistant electric arc bond pattern, the zone of droplet transfer is bigger; The foreign gas that makes wire melting produce is more prone to separate out; Reduce the tendency that produces pore in the weld seam, when deposition rate is higher, reduced the crackle tendency simultaneously; Present device is simple, cost is low, is convenient in commercial production, promote.
(4) description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is welding wire of the present invention and deposited metal short circuit sketch map;
Fig. 3 is a heated filament electric arc starting the arc sketch map of the present invention;
Fig. 4 is a composite heat power supply filler wire sketch map of the present invention;
Fig. 5 is a formation particle transition sketch map of the present invention.
(5) specific embodiment
For example the present invention is described further below in conjunction with accompanying drawing.
Embodiment 1: combine Fig. 1; The double T IG composite heat power supply welding equipment that a kind of TIG power supply of the present invention is auxiliary; It is made up of main TIG power supply, TIG master's welding gun, wire guiding nipple, secondary TIG power supply, wire feeder and workpiece; It is characterized in that: main TIG power supply connects TIG master's welding gun and workpiece respectively, and main TIG power supply, TIG master's welding gun, main welding arc and workpiece constitute main welding circuit; Secondary TIG power supply connects wire guiding nipple and workpiece respectively, and wire guiding nipple inside penetrates the welding wire of being sent here by wire feeder, and wire guiding nipple, secondary TIG power supply, workpiece and welding pool constitute the heated filament loop, wire feeder and workpiece insulation.
The welding method that is realized by the auxiliary double T IG composite heat power supply welding equipment of TIG power supply is: in conventional argon tungsten-arc welding system, introduce secondary TIG power supply, two electrodes of secondary TIG power supply are connected on wire feeding mouth and the workpiece formation galvanic circle respectively; Form different droplet transfer modes through the size that changes secondary TIG source current in the welding process, make welding wire under the condition of resistance heat or arc heat or the two coexistence, be heated, adopt secondary TIG power supply assistant heating welding wire; Main TIG power supply and secondary TIG power supply can be dc source or be AC power, or a TIG power supply is that another TIG power supply of dc source is for exchanging the metal material that welding wire selection resistivity is bigger; The welding wire fusing point can be higher or lower than the fusing point of workpiece substrate, and secondary TIG power supply is taked straight polarity direct current, through regulating the size of secondary TIG power supply and main TIG source current; Make double T IG thermal source form matched well; Simultaneously, change the wire feed position of welding wire, change the mode of heated filament and the interim form of molten drop; Secondary TIG source current hour; Motlten metal keeps short-circuit condition, the heated filament loop heat that has a resistance that welding wire is heated on welding wire and the workpiece substrate, and the droplet transfer relies on main arc fusing; When main TIG source current is big, improves welding wire and send the position to, between welding wire end and workpiece, form assistant electric arc, the heat production of assistant electric arc adds the thermosetting molten drop to the welding wire end, under gravity, arc force and low main arc heat, forms the particle transition; Secondary TIG source current is between above-mentioned two kinds of situation the time; Fusing under main arc effect when welding wire is short-circuited; Produce assistant electric arc between welding wire end and the workpiece substrate; Because burn-off rate is lower than wire feed rate, and is short-circuited, the process of arcing, short circuit, fusing so takes place repeatedly.
Embodiment 2: combine Fig. 1-Fig. 5; It is low that the present invention is based on conventional tungsten electrode argon arc welding welding efficiency; Tungsten electrode loaded current limited in one's ability limited the problem that it is used in big slab and built-up welding field, proposed the hot wire welding connection technology under the effect of a kind of double T IG composite power source.Thereby resistance heat that the auxiliary TIG power supply of utilization produces or arc heat heating welding wire improve the sweating heat input on the whole and remedy the restriction of argon tungsten-arc welding owing to the limited heat input aspect that causes of tungsten electrode bearing capacity; Simultaneously, adopt double T IG composite power source, alleviated power capacity requirement, in the service life of having improved tungsten electrode, improved production efficiency the TIG power supply.Because the heat of composite heat power supply is concentrated to the welding wire end, reduced the heat input of parent metal, can reduce the meltage of parent metal in the weld deposit process, have remarkable advantages for the welding between the difficult wlding material of xenogenesis.The auxiliary double T IG composite heat power supply welding method of TIG power supply is when adopting argon tungsten-arc welding; On the welding wire of giving, pass to a certain size auxiliary current; Between secondary TIG power supply-welding wire-workpiece three, form the galvanic circle, the size through changing auxiliary current and the position of welding wire end wire feed, the heat that has a resistance in welding wire inside or between welding wire and workpiece, produce assistant electric arc; The heat of this thermal source and main TIG electric arc is compounded to form double T IG composite heat power supply; The heat distribution of composite heat power supply is concentrated to the welding wire end, and the welding wire end is heated in a big way, thereby forms the auxiliary double T IG composite heat power supply welding of TIG power supply.
The auxiliary current that said secondary TIG power supply provides is through following method setting: select for use the material of good conductivity such as copper alloy to process wire feeding mouth, at first, make between welding wire and the workpiece and insulate; Then, the both positive and negative polarity of secondary TIG power supply is connected on respectively on wire feeding mouth and the workpiece, produces assistant electric arc between welding wire and workpiece.Through regulating the size of welding condition and auxiliary electrical flow valuve; Reach the auxiliary current rational Match that welding current that main TIG power supply provides and secondary TIG power supply provide; Make the droplet transfer show as following three kinds of transition modes: 1, auxiliary current hour, the deposited metal generation physics on welding wire and the workpiece in the molten bath contacts the formation short circuit; The auxiliary current heat that has a resistance during through welding wire; Welding wire is carried out preheating, and welding wire is directly mixed with molten pool metal under arc force and function composite by electromagnetic stirring by the continuous melting of main arc heat; When 2, auxiliary current is big; Suitably improve the position of sending to of welding wire; The assistant electric arc that between welding wire and workpiece, ignites, the welding wire end is heated under the effect of arc heat, under molten drop gravity, arc force and low main arc energy, forms particle transition stably; 3, auxiliary current between 1 and 2 two kind of pattern between, suitably adjust the position of sending to of welding wire, the welding wire end is short-circuited with deposited metal earlier; With the fusing of welding wire end, the electric arc that between workpiece and welding wire, ignites forms the transition of part particle under higher main arc energy; Along with time lengthening, melting rate is lower, is melted by main arc before welding wire and deposited metal are about to be short-circuited; Carry out so repeatedly, welding wire is heated under the effect of resistance heat and the heat production of electric arc institute.There are two kinds of designs secondary TIG power electrode position: 1, electrode is positioned at tungsten electrode the place ahead (along on the welding direction), and workpiece is had preheating effect to a certain degree; 2, electrode is positioned at the tungsten electrode rear, and butt welding is sewed with the effect of certain post weld heat treatment.
The equipment of the double T IG composite heat power supply new welding technology that the TIG power supply is auxiliary comprises workbench, anchor clamps, major-minor tungsten argon arc welding machine, welding gun, wire feeder; Insulate between wire feeder and the workpiece; Form main welding circuit between main tungsten argon arc welding machine-welding gun-workpiece-workbench; The heated filament loop that forms between secondary argon tungsten-arc welding power supply-wire feeder-workpiece-workbench; The electrode that connects workpiece in the heated filament loop comprises that the tungsten electrode front and back connect method for two kinds, play the effect of weld preheating and post weld heat treatment respectively.
Embodiment 3: combine Fig. 1-Fig. 5, the present invention has introduced secondary TIG power supply in the argon tungsten-arc welding system, at first makes the insulation of wire feeder and welding wire and workpiece, two electrodes of secondary TIG power supply are connected on respectively on wire feeding mouth and the workpiece, and the formation galvanic circle, as shown in Figure 1.When welding process begins, connect the welding major loop, the minor arc that ignites is to workpiece preheating 1～2s; Then send welding wire to, when the welding wire end is connected the heated filament loop during apart from workpiece 5～8mm, under the effect of the arc-plasma that minor arc produced through wire feeder; Be easy to light assistant electric arc between welding wire end and the workpiece, under the effect of electric arc heat production, the fusing of welding wire end also forms molten drop; Along with growing up of molten drop, assistant electric arc reduces the welding wire heat effect gradually, because capillary effect between welding wire and the molten drop; Molten drop is suspended on the welding wire end, and wire melting speed is lower than the welding wire feed rate, and the arc length of assistant electric arc constantly reduces; The molten drop of welding wire end is fused in the main arc central area, and welding wire carries out the transition on the parent metal with the mode of big molten drop, and next the transient mode of molten drop mainly contains following three kinds of transition modes:
One, auxiliary current hour, when deposited metal reached Desired Height on matrix, welding wire end and parent metal were short-circuited; Owing to adopt TIG power supply with steep drop characteristic; Auxiliary current is constant, can not produce like the quick-fried disconnected phenomenon of crossover during short circuiting transfer in the gas metal-arc welding, and the droplet transfer mainly continues fusing through the heat effect of main arc with the welding wire of sending to; As shown in Figure 2, this kind short-circuit condition remains.
When two, auxiliary current was big, the position of sending to of suitably improving welding wire was when welding wire end and deposited metal are short-circuited; This moment, the heated filament loop produced higher resistance heat on welding wire, and welding wire can melt under less main arc heat effect, made welding wire in the big zone of main arc, promptly fused by the main arc heat; And between welding wire end and workpiece, form assistant electric arc, as shown in Figure 3, because the effect of welding wire resistance heat; Fusing promptly takes place and forms the molten drop suspension in the welding wire end under less main arc heat, and is as shown in Figure 4, continues the feeding of heating and welding wire along with resistance heated filament, electric arc; Welding wire melting rate and feed rate are suitable; The assistant electric arc arc length reduces not obvious, when droplet size increases to a certain degree, reaches under the lower minor arc heat effect at molten drop gravity, arc force; Molten drop carries out the transition on the deposited metal with the form of fine particle; Assistant electric arc continues between new welding wire end that forms and workpiece, to burn, and so forms the particle transition state of similar gas metal-arc welding, and is as shown in Figure 5.Because required heat of droplet transfer is less, transition is easy, and whole process does not steadily have and splashes, and the raising and the welding quality of welding efficiency all produced influence energetically.
Three, when auxiliary current numerical value is between above two kinds of transient mode current corresponding, welding wire at first with matrix on deposited metal be short-circuited because relatively large resistance heated filament effect; Make on the welding wire than the welding wire in the length scope by the heat melts of main arc, simultaneously, because the existence of a large amount of plasmas in main arc space; Assistant electric arc ignites between welding wire end and workpiece again; Along with the accumulation of heat, the length of assistant electric arc reduces, before welding wire end and motlten metal are short-circuited; The molten drop of welding wire end is fused by welding wire, forms the particle transition.At this moment, the transient mode of molten drop mainly is a main arc fusing welding wire, and is different from the transition mode under second kind of gravity of mode and the arc force effect.
More than three kinds of transient modes all cause the melting efficiency of welding wire obviously to exceed traditional TIG welding efficiency, butt welding is delivered a child and is produced the raising and the remarkable advantages that reduced cost of efficient.
Simultaneously, under the auxiliary current effect, make welding wire and part matrix be heated in the heated filament loop; Under this kind transient mode; Auxiliary current heats welding wire through the welding wire heat that has a resistance, and makes the needed minor arc heat of wire melting reduce, thereby has increased deposition efficiency.Simultaneously; When auxiliary current passed through parent metal, if workpiece top electrode wiring position is in the place ahead of tungsten electrode in the heated filament loop, auxiliary current had the preheating effect through the resistance heat that workpiece produces to parent metal; When wiring position was positioned at the tungsten electrode rear, butt welding was sewed with the effect of post weld heat treatment.
Application of the present invention: be used for the welding of ferrous metal such as mild steel, steel alloy, special steel, stainless steel; Be used to out cut or do not open butt joint, overlap joint, handing-over, the T connector of cut; Be used for the welding of straight weld, girth joint or space curve weld seam; The present invention is specially adapted to apply high-melting point metal at low melting point matrix surface heap; Can solve the problem that the low melting point matrix is prone to take place fusing, solve the difficulty that heap applies refractory metal on the low melting point matrix, can improve deposition efficiency simultaneously; Enhance productivity; Reduce the tungsten electrode loss, reduce welding cost, can also improve weldquality under the assistant electric arc effect.
A kind ofly utilize actual welding parameter of the present invention:
Workpiece substrate is that bore is 60mm, and thickness is the 35CrMnSi cannon bullet of 15mm, and welding wire is a pure iron; Carry out the bearing band built-up welding; Main TIG electric power outputting current is 250A, and auxiliary current is 40～60A, and boost voltage is about 20V; Wire feed rate is 3m/min, adopts above new technology to obtain the pure iron bearing band of high-quality on the surface of shell.
The principle of confirming welding conditions is: should take all factors into consideration welded form, performance, size; And carry out rational Match with welding condition; According to actual welding object and material main welding condition is optimized; Consider the bearing capacity of welding wire simultaneously, reasonable energy distribution and combination are carried out in heated filament loop and main welding circuit, can guarantee to obtain the welding point of higher production efficiency and high-quality.
Claims (1)
1. welding method of using the auxiliary double T IG composite heat power supply welding equipment of TIG power supply and realizing; It is characterized in that: in conventional argon tungsten-arc welding system, introduce secondary TIG power supply; Two electrodes of secondary TIG power supply are connected on respectively on wire guiding nipple and the workpiece, form the galvanic circle, form different droplet transfer modes through the size that changes secondary TIG source current in the welding process; Make welding wire under the condition of resistance heat or arc heat or the two coexistence, be heated; Adopt secondary TIG power supply assistant heating welding wire, main TIG power supply is dc source or is AC power that secondary TIG is a dc source; The metal material that welding wire selection resistivity is bigger, the welding wire fusing point can be higher or lower than the fusing point of workpiece substrate;
Described secondary TIG power supply is taked straight polarity direct current, through regulating the size of secondary TIG power supply and main TIG source current, makes double T IG thermal source form matched well; Simultaneously, change the wire feed position of welding wire, change the mode of heated filament and the interim form of molten drop; Secondary TIG source current hour; Motlten metal keeps short-circuit condition, the heated filament loop heat that has a resistance that welding wire is heated on welding wire and the workpiece substrate, and the droplet transfer relies on main arc fusing; When secondary TIG source current is big, improves welding wire and send the position to, between welding wire end and workpiece, form assistant electric arc, the heat production of assistant electric arc adds the thermosetting molten drop to the welding wire end, under gravity, arc force and low main arc heat, forms the particle transition; Secondary TIG source current is between above-mentioned two kinds of situation the time; Fusing under main arc effect when welding wire is short-circuited; Produce assistant electric arc between welding wire end and the workpiece substrate; Because burn-off rate is lower than wire feed rate, and is short-circuited, the process of arcing, short circuit, fusing so takes place repeatedly;
Wherein, The double T IG composite heat power supply welding equipment that described TIG power supply is auxiliary; It is made up of main TIG power supply, TIG master's welding gun, wire guiding nipple, secondary TIG power supply, wire feeder and workpiece; Main TIG power supply connects TIG master's welding gun and workpiece respectively, and main TIG power supply, TIG master's welding gun, main welding arc and workpiece constitute main welding circuit; Secondary TIG power supply connects wire guiding nipple and workpiece respectively, and wire guiding nipple inside penetrates the welding wire of being sent here by wire feeder, and wire guiding nipple, secondary TIG power supply, workpiece and welding pool constitute the heated filament loop, wire feeder and workpiece insulation.
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| JP2512729B2 (en) * | 1986-12-09 | 1996-07-03 | バブコツク日立株式会社 | Semi-automatic hot wire TIG welding equipment |
| US6127651A (en) * | 1996-04-29 | 2000-10-03 | Westinghouse Electric Company Llc | Welding apparatus and method |
| CN1446662A (en) * | 2003-04-25 | 2003-10-08 | 哈尔滨工业大学 | Compound welding method of argon arc welding with tungsten electrode-consumable electrode using dual power supplies in single side, double arc and molten pool |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007237225A (en) * | 2006-03-08 | 2007-09-20 | Jfe Steel Kk | High-speed hot wire multi-electrode tig welding method of thin steel plate |
| JP6015108B2 (en) * | 2012-05-07 | 2016-10-26 | 株式会社リコー | Thin film manufacturing apparatus and thin film manufacturing method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2512729B2 (en) * | 1986-12-09 | 1996-07-03 | バブコツク日立株式会社 | Semi-automatic hot wire TIG welding equipment |
| CN2125475U (en) * | 1992-01-29 | 1992-12-23 | 天津大学 | Pre-heater for welding electrode |
| US6127651A (en) * | 1996-04-29 | 2000-10-03 | Westinghouse Electric Company Llc | Welding apparatus and method |
| CN1446662A (en) * | 2003-04-25 | 2003-10-08 | 哈尔滨工业大学 | Compound welding method of argon arc welding with tungsten electrode-consumable electrode using dual power supplies in single side, double arc and molten pool |
Non-Patent Citations (2)
| Title |
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| JP特公平6-15108B2 1994.03.02 |
| JP特开2007-237225A 2007.09.20 |
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