CN104772552B - A kind of three gas shield indirect arcs welding method, device, overlaying method and narrow gap welding method - Google Patents
A kind of three gas shield indirect arcs welding method, device, overlaying method and narrow gap welding method Download PDFInfo
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- CN104772552B CN104772552B CN201510145041.4A CN201510145041A CN104772552B CN 104772552 B CN104772552 B CN 104772552B CN 201510145041 A CN201510145041 A CN 201510145041A CN 104772552 B CN104772552 B CN 104772552B
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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
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
-
- 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
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/0213—Narrow gap welding
-
- 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
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/067—Starting the arc
- B23K9/0672—Starting the arc without direct contact between electrodes
-
- 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
- B23K9/164—Arc welding or cutting making use of shielding gas making use of a moving fluid
-
- 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
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
- B23K9/1735—Arc welding or cutting making use of shielding gas and of a consumable electrode making use of several electrodes
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- Arc Welding In General (AREA)
Abstract
The invention discloses a kind of three gas shield indirect arcs welding method, device, overlaying method and narrow gap welding method.The root wire (middle welding wire) in three root wires is connected on two same electrodes of arc power and centre is arranged in before methods described welding, remaining two root wire (side silk) is respectively connecting on two another electrodes of arc power, and side silk is arranged in the both sides of middle welding wire respectively；So that middle welding wire and side silk can intersect going up on one point；During welding, two arc powers are made to export simultaneously so that coupling indirect arc to be produced on the intersection point between middle welding wire, side silk, when near mother metal to be welded, the coupling indirect arc causes that welding workpiece part is melted, and forming molten bath with the liquid metal of welding wire transition realizes welding process.The present invention efficiently solves the problems, such as that twin-wire indirect arc welding heat input is not enough, while effectively improving wire melting efficiency and indirect arc welding Parameter adjustable scope using the coupling indirect arc for producing.
Description
Technical field
The invention belongs to materials processing technology field, a kind of three gas shield indirect arcs welding is particularly related to
Method, device, overlaying method and narrow gap welding method.
Background technology
In modern production, novel welding method is respectively provided with heavy to closing to the raising of production efficiency and the raising of enterprise competitiveness
The effect wanted.Widely used gas metal-arc welding, the key for improving welding efficiency is to improve welding wire cladding efficiency, and is welded
The cladding efficiency of silk is mainly what is determined by welding current size.For conventional arc welding, power supply connection is in welding workpiece
And welding wire between, so the total current for flowing through welding wire is necessarily equal to the total current for flowing through welding workpiece, therefore welded using lifting
Electric current is improved during welding efficiency, can inevitably cause the increase of welding workpiece heat input, and the increase of heat input can be led
Cause the series of problems such as property of welded joint decline, welding deformation increase.
Different from traditional arc welding, workpiece does not connect power supply during indirect arc welding, and electric arc is only produced between the electrodes.At present
The indirect arc of exploitation is generally twin-wire indirect arc, and such as Beijing University of Technology proposes what laser-twin-wire indirect arc was combined
Welding method (CN103753024A)；Between University Of Tianjin proposes a kind of TIG/MIG of cast iron valve sealing surface weld deposit copper alloy
Connect arc method (CN103212771A)；And Shandong University also develops and have studied double welding rod indirect arc weldings and mariages Indirect Electro
Arc-welding；Harbin Institute of Technology's also R and D TIG-MIG indirect arc weldings.But existing twin-wire indirect arc welding is equal
With certain limitation, i.e. not only available parameter narrow range, and when electric current increase to a certain extent when, electric arc becomes dispersion
And welding process stability cannot be ensured, deposition efficiency and welding efficiency are all difficult to further increase.
The content of the invention
In view of the defect that prior art is present, the invention aims to provide a kind of three gas shield indirect arc weldings
Method is connect, it passes through to be distributed using different power supply connected modes and welding wire, efficiently solves twin-wire indirect arc welding heat input
Not enough problem, while effectively improving wire melting efficiency and indirect arc welding ginseng using the coupling indirect arc for producing
Number adjustable extent.
To achieve these goals, technical scheme：
A kind of three gas shield indirect arcs welding method, it is characterised in that：
Methods described implements welding process by three root wires and two arc powers；
Specifically include
Before welding, the root wire in three root wire is first connected to the same electrode of described two arc powers
On, remaining two root wire is respectively connecting on another electrode of described two arc powers, welding workpiece not with the electric arc
Power supply is connected；The welding wire of two same electrodes of arc power of above-mentioned connection is then arranged in centre, the welding wire is called middle weldering
Silk；Remaining two root wire is arranged in the both sides of the middle welding wire respectively, and remaining two root wire is called side silk；So that each institute
Stating side silk can intersect on one point with the middle welding wire holding identical angle, and above-mentioned middle welding wire and side silk respectively
On；
During welding, above-mentioned two arc power is made to export simultaneously, so that between above-mentioned middle welding wire and side silk
Coupling indirect arc is produced on intersection point, when the coupling indirect arc near mother metal to be welded, the coupling indirect arc causes weldering
Workpiece portion fusing is connect, the liquid metal with welding wire transition forms molten bath, welding point can be formed after cooled and solidified, realize weldering
Termination process.
Further, the middle welding wire can select various arrangement modes with side silk, wherein, the middle welding wire can
Arrangement vertically downward is arranged with horizontal line into certain inclination angle；Each side silk is respectively symmetrically and is arranged in weldering in the middle of described
The both sides of silk；10 °~80 ° of angle between the middle welding wire and each side silk.
Described two arc powers can be by two dc sources, two pulse powers and a dc source and one
Any one combination in pulse power combination.
The protective gas that the welding method carries out employed in welding process can be CO2, one kind in Ar or CO2With
The gaseous mixture of Ar, protection air-flow is 0.1-50L/min.
The present invention also provides a kind of device for realizing above-mentioned three gas shield indirect arcs welding method, and its feature exists
In：
Described device is made up of three root wires and two arc powers；
Wherein, the root wire in three root wire is connected on the same electrode of described two arc powers, and is made
Obtain the welding wire and be arranged in three root wire middle positions, the welding wire is called middle welding wire；
Remaining two root wire is respectively connecting on another electrode of described two arc powers so that two root wire
It is arranged in the both sides of the middle welding wire respectively, and with the middle welding wire keeps identical angle respectively, claims remaining two
Welding wire is side silk；
Welding workpiece is not connected with the arc power；
Cause that above-mentioned middle welding wire and side silk can intersect simultaneously to go up on one point；
During welding, above-mentioned two arc power is made to export simultaneously, so that between above-mentioned middle welding wire and side silk
Coupling indirect arc is produced on intersection point, when the coupling indirect arc near mother metal to be welded, the coupling indirect arc causes weldering
Workpiece portion fusing is connect, the liquid metal with welding wire transition forms molten bath, welding point can be formed after cooled and solidified, realize weldering
Termination process.
The middle welding wire can select various arrangement modes with side silk, wherein, the middle welding wire can be vertically downward
Arrangement is arranged with horizontal line into certain inclination angle；Each side silk is respectively symmetrically and is arranged in the two of the middle welding wire
Side；10 °~80 ° of angle between the middle welding wire and each side silk.
Described two arc powers can be by two dc sources, two pulse powers or a dc source and one
Any one combination in individual pulse power combination.
The protective gas that the welding method carries out employed in welding process can be CO2, one kind in Ar or CO2With
The gaseous mixture of Ar, protection air-flow is 0.1-50L/min.
Method is welded based on above-mentioned three gas shield indirect arcs simultaneously, present invention also offers a kind of overlaying method,
It is characterized in that：Methods described is implemented in weld deposit process, is filling metal with above-mentioned three root wire, using the coupling Indirect Electro
Heat entrained by the arc column heat of arc and droplet transfer, realizes the welding of filling metal and welding workpiece.
Method is welded based on above-mentioned three gas shield indirect arcs simultaneously, present invention also offers a kind of narrow gap gas
Three indirect arc soldering methods of protection, it is characterised in that：Methods described is implemented in welding process so that the three root wires arrangement
In same plane, to realize narrow gap welding.
Beneficial effects of the present invention：
This three gas shield indirect arc welding workpiece do not connect power supply, and electric arc only forms indirect arc, work in welding wire end
Can be greatly lowered in the absence of active spot area, deposition efficiency high, saving electric energy, penetration ratio on part；Due to its special welding wire
Distribution mode, generates electric arc coupling, and compared with mariages gas shield indirect arc welding, its available suitable weldering electric current increases
Plus, solve the problems, such as that mariages gas indirect arc is not enough to mother metal heat input, and by increasing welding current, further increase
Welding wire deposition efficiency, improves production efficiency.
Brief description of the drawings
Fig. 1：Twin-wire indirect arc welding principle schematic；
Fig. 2：Principle schematic of the invention；
Fig. 3 a：Several typical welding wire distribution mode schematic diagrames of the present invention；
Fig. 3 b：Schematic diagram after several typical welding wire distribution mode transformation angles of the present invention；
Fig. 4：The described three indirect arc welding example schematics of narrow gap of invention.
In figure：1st, arc power, 2, arc power, 3, main silk or welding wire in the middle of being referred to as, 4, side silk, 5, side silk, 6, treat
Weldering mother metal.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with accompanying drawing, the present invention is entered
Row is further described.
As shown in figure 1, twin-wire indirect arc welding is particularly its power supply connected mode and welding wire distribution mode so that between mariages
Arc welding is connect when electric current increases to certain value, electric arc dispersion phenomenon can occur under electromagnetic action.Therefore exist to mother metal heat
The shortcomings of input is not enough, welding parameter selection is narrow.
The defect and its Producing reason existed based on above-mentioned twin-wire indirect arc welding, the present invention devise a kind of three gas
Body protects indirect arc soldering method, and it passes through to use different power supply connected mode and welding wire to be distributed to overcome twin-wire indirect arc
The problems such as welding heat input is not enough.
As shown in Fig. 2 three gas shield indirect arcs welding method, methods described is by three root wires and two
Individual arc power implements welding process；
Specifically include
Before welding, the root wire in three root wire is first connected to the same of described two arc powers (1,2)
On electrode, remaining two root wire is respectively connecting on another electrode of described two arc powers (1,2), welding workpiece not with
The arc power connection；The welding wire of two same electrodes of arc power of above-mentioned connection is then arranged in centre, claims the welding wire
It is middle welding wire 3；Remaining two root wire arrangement (can symmetry arrangement), on the both sides of the middle welding wire, claim remaining two root bead
Silk is side silk (4,5)；So that the middle welding wire keeps certain angle (identical angle) with each side silk respectively, and on
Stating middle welding wire and side silk can intersect and go up on one point；
During welding, above-mentioned two arc power is made to export simultaneously, so that between above-mentioned middle welding wire and side silk
Coupling indirect arc is produced on intersection point, when the coupling indirect arc near mother metal 6 to be welded, the coupling indirect arc causes weldering
Workpiece portion fusing is connect, the liquid metal with welding wire transition forms molten bath, welding point can be formed after cooled and solidified, realize weldering
Termination process.
Further, three root wire has various arrangement modes, and generally middle welding wire can be vertically downward
Certain angle can be inclined with horizontal line to arrange；Welding wire angle can be 10 °~80 ° adjustable in the middle of Bian Siyu.Fig. 3 a, 3b give
Several typical welding wire arrangement modes：Such as scheme a, three root wires are distributed in one plane；B, side silk is respectively in middle welding wire
Both sides；C, Bian Si are simultaneously in the side of middle welding wire；D, middle welding wire inclines certain angle etc. with horizontal line, and figure a1 to d1 is then
It is figure a to d, corresponding accompanying drawing after certain visual angle is changed accordingly, wherein, silk is middle welding wire based on z in figure, and b is side silk.
The arc power then can be by two dc sources, two pulse powers or a dc source and a pulse simultaneously
Any one combination in power supply.The protective gas is CO2, Ar or CO2With the gaseous mixture of Ar, protection air-flow is 0.1-50L/
min。
During methods described can be applied to overlaying method simultaneously, it is implemented in weld deposit process, using three root wire as filling out
Metal is filled, using the heat entrained by the arc column heat of indirect arc and droplet transfer, realizes filling metal with welding workpiece
Welding.
Separately, while methods described can also be applied to three indirect arc soldering methods of narrow gap gas shield, implementation was welded
Cheng Zhong so that three root wires realize plane distribution, welded gaps can be reduced to below 10mm, meet big heavy-gauge sheeting narrow gap welding
Connect.
Concrete operating principle of the present invention is：Produce electric arc in the middle of during welding between welding wire and two sides silk respectively, but by
In middle welding wire be electric current (the magnetic field form main acceptor silk of electric arc produced by of the electric current that flows through of main silk always greater than side silk
Effect)；Simultaneously according to the principle of arc stiffness so that the corresponding arc shape of electric arc produced by the present invention is mainly along main silk
Extended line distribution, can be weld seam and mother so so as to avoid the scattered situation of electric arc that twin-wire indirect arc welding has
Material provides enough heat inputs.It should be noted simultaneously that although two sides silk sets up indirect arc respectively with main silk in theory,
But due to acceptor's silk magnetic field influence simultaneously, two indirect arcs can be coupled into an electric arc, i.e., described coupling indirect arc；This
Invention improves wire melting efficiency and indirect arc welding Parameter adjustable scope using indirect arc is coupled, and meets low dilution
Rate built-up welding and big slab narrow gap efficient welding demand.
It is following to provide classical embodiment the present invention will be described：
Embodiment 1：Three gas shield indirect arc built-up welding.
Using a of welding wire distribution mode shown in Fig. 3, the middle welding wire of its same pole of connection power supply vertically downward, two sides
Silk is 20 degree with middle welding wire angle, is symmetrically distributed in middle welding wire both sides, and three welding wires in one plane intersect together
On one point.Wherein, three steel welding wire model ER50-6, diameter is 1.2mm, and power supply uses a dc source and an arteries and veins
Dc source is rushed, corresponding protective gas is 80%CO2With 20%Ar gaseous mixtures；In Q235 steel plates for mother metal has carried out plane heap
Weldering, board dimension is 200mm × 100mm × 5mm, and welding gun is highly 10mm, and welding total current is 320A, and speed of welding is
500mm/min, has as a result obtained showing that smooth even is consistent, and mother metal is well combined, and does not have poor weld；So as to demonstrate
This three gas shield indirect arc built-up welding have the advantages that deposition efficiency is high, heat input is low, dilution rate is low.
Embodiment 2：Three indirect arc weldings of narrow gap gas shield.
Such as Fig. 4 (in figure,1, connection cables；2, main silk；3, side silk；4, mother metal to be welded；5, back side pad.), what it was used
It is 30 degree that welding wire is distributed as middle welding wire and Bian Si angles, using three steel welding wires of diameter 1.2mm, welding wire model ER50-
6, welding base metal is Q235 mild steel, and board dimension is 200mm × 100mm × 20mm；The back side uses ceramic substrate, I type cuts,
Butt-joint clearance is 8mm, and the total welding current for using is 340A, and speed of welding is 500mm/min, realizes good side wall and melts
Close.Because its gap is narrower compared with other method, thus with it is efficient the characteristics of.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technology according to the present invention scheme and its
Inventive concept is subject to equivalent or change, should all be included within the scope of the present invention.
Claims (10)
1. a kind of three gas shield indirect arcs weld method, it is characterised in that：
Methods described implements welding process by three root wires and two arc powers；
Specifically include
Before welding, first the root wire in three root wire is connected on the same electrode of described two arc powers, its
Two remaining root wires are respectively connecting on another electrode of described two arc powers, and welding workpiece does not connect with the arc power
Connect；The welding wire of two same electrodes of arc power of above-mentioned connection is then arranged in centre, the welding wire is called middle welding wire；Remaining
Two root wires be arranged in the both sides of the middle welding wire respectively, remaining two root wire is called side silk；So that each side silk
Keep identical angle with the middle welding wire respectively, and above-mentioned middle welding wire and side silk can intersect and go up on one point；
During welding, above-mentioned two arc power is made to export simultaneously so as to be produced on the intersection point between above-mentioned middle welding wire and side silk
Raw coupling indirect arc, when the coupling indirect arc near mother metal to be welded, the coupling indirect arc causes welding workpiece portion
Divide fusing, the liquid metal with welding wire transition forms molten bath, welding point can be formed after cooled and solidified, realize welding process.
2. three gas shield indirect arcs according to claim 1 weld method, it is characterised in that：The middle welding wire
Can vertically downward arrange or be arranged into certain inclination angle with horizontal line；Each side silk is respectively symmetrically and is arranged in the centre
The both sides of welding wire；10 °~80 ° of angle between the middle welding wire and each side silk.
3. three gas shield indirect arcs according to claim 1 weld method, it is characterised in that：Described two electric arcs
Power supply is selected from the one kind in two dc sources, two pulse powers, a dc source and a combinations for the pulse power.
4. three gas shield indirect arcs according to claim 1 weld method, it is characterised in that：The welding method
It can be CO to carry out the protective gas employed in welding process2And one kind or CO in Ar2With the gaseous mixture of Ar, gas is protected
Stream is 0.1-50L/min.
5. a kind of device for realizing the welding method as described in claim 1-4 any one, it is characterised in that：
Described device is made up of three root wires and two arc powers；
Wherein, the root wire in three root wire is connected on the same electrode of described two arc powers, and causes to be somebody's turn to do
Welding wire is arranged in three root wire middle positions, and the welding wire is called middle welding wire；
Remaining two root wire is respectively connecting on another electrode of described two arc powers so that the two root wires difference
It is arranged in the both sides of the middle welding wire, and with the middle welding wire keeps identical angle respectively, claims remaining two root wire
It is side silk；
Welding workpiece is not connected with the arc power；
Cause that above-mentioned middle welding wire and side silk can intersect simultaneously to go up on one point；
During welding, above-mentioned two arc power is made to export simultaneously so as to be produced on the intersection point between above-mentioned middle welding wire and side silk
Raw coupling indirect arc, when the coupling indirect arc near mother metal to be welded, the coupling indirect arc causes welding workpiece portion
Divide fusing, the liquid metal with welding wire transition forms molten bath, welding point can be formed after cooled and solidified, realize welding process.
6. device according to claim 5, it is characterised in that：
The middle welding wire can vertically downward arrange or be arranged into certain inclination angle with horizontal line；Each side silk is right respectively
Title is arranged in the both sides of the middle welding wire；10 °~80 ° of angle between the middle welding wire and each side silk.
7. device according to claim 5, it is characterised in that：
Described two arc powers are selected from two dc sources, two pulse powers, a dc source and a pulse powers
Combination in one kind.
8. device according to claim 5, it is characterised in that：
The protective gas that the welding method carries out employed in welding process can be CO2, one kind in Ar or CO2With Ar's
Gaseous mixture, protection air-flow is 0.1-50L/min.
It is 9. a kind of to be based on three overlaying methods of gas shield indirect arc, it is characterised in that：
It includes the method as described in any one in Claims 1-4, and in weld deposit process is implemented, with above-mentioned three root bead
Silk is filling metal, using the heat entrained by the arc column heat of the coupling indirect arc and droplet transfer, realizes filling gold
The welding of category and welding workpiece.
10. it is a kind of to be based on three narrow gap gas shields of gas shield indirect arc, three indirect arc soldering methods, its feature
It is：
It includes the method as described in any one in Claims 1-4, and in welding process is implemented so that described three
Welding wire is arranged in same plane, to realize narrow gap welding.
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| CN107414259B (en) * | 2017-09-20 | 2019-08-23 | 哈尔滨工业大学 | Auxiliary silk filling GMA increasing material manufacturing device and method for functionally gradient material (FGM) manufacture |
| CN108500266B (en) * | 2018-04-19 | 2020-01-07 | 河北科技大学 | 7000 series aluminum alloy additive manufacturing method and system |
| CN109079287B (en) * | 2018-09-14 | 2020-09-29 | 大连理工大学 | Three-wire gas-shielded indirect arc welding method and device and application thereof |
| CN110091035A (en) * | 2019-06-03 | 2019-08-06 | 河北科技大学 | A kind of high-entropy alloy increasing material manufacturing device and increasing material manufacturing method |
| CN110497065B (en) * | 2019-08-30 | 2021-03-19 | 大连理工大学 | Variable-polarity three-wire gas-shielded indirect arc welding method and device and application thereof |
| CN111390338B (en) * | 2020-04-03 | 2022-02-11 | 哈尔滨工业大学 | Method for additive manufacturing of TiAl intermetallic compound through heterogeneous dual-wire TOP-TIG electric arc |
| CN111531252A (en) * | 2020-05-08 | 2020-08-14 | 西南交通大学 | Method and device for improving thin-wall part GMA additive manufacturing efficiency and heat accumulation |
| CN112139629A (en) * | 2020-09-23 | 2020-12-29 | 天津七所高科技有限公司 | High-frequency pulse three-wire indirect electric arc welding method and device |
| CN113732446B (en) * | 2021-08-25 | 2023-03-10 | 中国船舶重工集团公司第七二五研究所 | Bypass coupling three-wire indirect electric arc welding method with controllable electric arc space structure |
| CN115121906B (en) * | 2022-07-26 | 2023-11-21 | 南京工程学院 | Welding-following heating system and use method |
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| JP4749555B2 (en) * | 2001-01-19 | 2011-08-17 | 株式会社ダイヘン | Three-electrode arc welding control method |
| JP3759114B2 (en) * | 2003-02-28 | 2006-03-22 | 株式会社神戸製鋼所 | Multi-electrode gas shielded arc welding method |
| CN100463756C (en) * | 2007-04-30 | 2009-02-25 | 上海冠达尔钢结构有限公司 | Three-wire submerged-arc welding method for thick plate, low alloy, high strength steel |
| CN101134260A (en) * | 2007-10-25 | 2008-03-05 | 上海交通大学 | Three-filum open arc welding method |
| CN202317400U (en) * | 2011-06-24 | 2012-07-11 | 毛宇 | Dual-power three-wire gas shield welding gun |
| JP5883674B2 (en) * | 2012-02-17 | 2016-03-15 | 株式会社神戸製鋼所 | Multi-electrode gas shield arc welding method and multi-electrode gas shield arc welding apparatus |
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