CN102581449A - Twin-wire vertical electrogas welding system with low welding heat input and welding method - Google Patents
Twin-wire vertical electrogas welding system with low welding heat input and welding method Download PDFInfo
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- CN102581449A CN102581449A CN2011103768902A CN201110376890A CN102581449A CN 102581449 A CN102581449 A CN 102581449A CN 2011103768902 A CN2011103768902 A CN 2011103768902A CN 201110376890 A CN201110376890 A CN 201110376890A CN 102581449 A CN102581449 A CN 102581449A
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- 238000000034 method Methods 0.000 title claims abstract description 33
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- 238000002844 melting Methods 0.000 claims description 12
- 230000008018 melting Effects 0.000 claims description 12
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000002826 coolant Substances 0.000 claims 3
- 230000008021 deposition Effects 0.000 abstract description 12
- 230000004927 fusion Effects 0.000 abstract 1
- 239000000498 cooling water Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000007787 solid Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
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Abstract
The invention provides a twin-wire vertical electrogas welding system with low welding heat input and a welding method. The system comprises a first welding power source, a second welding power source, an integrated power source box, a first wire feeder, a second wire feeder, a first gas shielded welding gun, a second gas shielded welding gun, a gas supply device, a control cabinet, an oscillator and a welding tractor, wherein homopolar output ends of the first welding power source and the second welding power source are in conductive connection with a head end of the first gas shielded welding gun, the other output end of the first welding power source is connected with a welded workpiece, and the other output end of the second welding power source is in conductive connection with a head end of the second gas shielded welding gun, so that heat input is greatly reduced while deposition rate can be increased, the system is stable and reliable, and impact toughness of a welding line is remarkably improved. Additionally, a twin-wire welding gun oscillating in the welding line can guarantee sufficient fusion of side walls of the welding line and a welding weld crater, so that mechanical properties of the welding line are remarkably enhanced.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of welding, and particularly relates to a low-welding-heat-input double-wire vertical electro-gas welding system and a low-welding-heat-input double-wire vertical electro-gas welding method.
[ background of the invention ]
The vertical electro-gas welding method based on the gas metal arc welding technology is a high-efficiency welding method which is very suitable for heavy metal structures, but the vertical electro-gas welding methods have the biggest problems that the welding heat input is high and is in direct proportion to the plate thickness, so the application range is greatly limited; moreover, the increase of heat input with the increase of the plate thickness can reduce the crystallization speed of the weld metal, thereby bringing about coarse grains, leading to the reduction of the mechanical property of the weld and seriously influencing the low-temperature impact toughness of the weld. The experimental results show that: the solid welding wire is adopted, the plate thickness exceeds 30mm, and the impact toughness of the welding seam is obviously reduced. This is a problem that limits the application of electrogas welding to the welding of large thickness plates. The only method for improving the problem at present is to adopt a special flux-cored wire for vertical electro-gas welding with special material components to refine grains through a metallurgical way, however, the use of the special flux-cored wire for vertical electro-gas welding is not only very expensive (the price is several times of that of a solid wire), but also the method does not reduce welding heat input from the essence, so the method is limited by the plate thickness. Therefore, even if the cost problem is not considered, there is a limitation in solving the problem of high welding heat input of the vertical electro gas welding from the aspect of the welding material. Therefore, in order to solve the application problem of the vertical electro-gas welding method in the large-thickness plate, a method capable of fundamentally reducing the welding heat input is required to be searched.
Weld heat input is measured as line energy, i.e., heat input energy per unit length of weld. The welding seam forming characteristic of the vertical electro-gas welding is that the whole welding seam groove (namely the area of a molten pool is equal to the sectional area of the welding seam groove) is fully welded at one time, and the welding speed is controlled by the rising speed of the liquid level of the molten pool. When the plate thickness is fixed (the sectional area of a welding groove is fixed), if the welding current is reduced, on one hand, the input power of a welding heat source is reduced, on the other hand, the deposition rate of a welding wire is also reduced, namely, the rising speed of the liquid level of a molten pool is reduced, and the welding speed is also reduced; conversely, increasing the welding current increases the input power of the welding heat source, but increases the welding wire deposition rate, namely, increases the molten pool liquid level rising speed and increases the welding speed. Therefore, when the conventional gas metal arc welding method is used, the welding wire deposition rate is in direct proportion to the welding current, so that the welding line energy of the vertical electro-gas welding is basically irrelevant to the welding current when the plate thickness is constant; when the plate thickness increases, the weld line energy inevitably increases due to the increase in the molten pool area. Therefore, for vertical electro-gas welding, the weld heat input is directly proportional to the plate thickness and cannot be adjusted by the weld specification.
In view of the above, in order to reduce the heat input in the vertical electro-gas welding, a welding method capable of improving the deposition rate and reducing the heat input, that is, a method capable of improving the deposition rate of the welding wire per unit current is required. At present, methods for improving the deposition rate of the welding wire at unit current include methods for increasing the dry elongation of the welding wire, using the polarity of a DCEN electrode, using helium or a multi-element gas and the like, but the improvement range of the methods is very limited, namely about 20%, and the methods are already used, for example, the conventional welding wire special for vertical electro-gas welding can obtain certain effect by matching with a DCEN connection method. Therefore, in order to fundamentally solve the problem of welding heat input of vertical electro-gas welding, a novel welding method capable of greatly improving the deposition rate of a welding wire of unit current is required to be found.
[ summary of the invention ]
In order to solve the technical problems in the prior art, the invention provides a vertical electro-gas welding system and a welding method which adopt double-wire welding and have low welding heat input and high welding seam mechanics.
The technical scheme adopted by the invention for solving the problems in the prior art is as follows:
a double-wire vertical electro-gas welding system with low welding heat input comprises a first welding power supply, a second welding power supply, an integrated power supply box, a first wire feeder, a second wire feeder, a first gas-shielded welding gun, a second gas-shielded welding gun, a gas supply device, a control box, a wiggler and a welding trolley; the first welding power supply and the second welding power supply are both connected with the input end of the integrated power supply box and supply welding working power; the first wire feeder, the second wire feeder and the control box are all connected with the output end of the integrated power box, and the first wire feeder and the second wire feeder are respectively connected with the first gas shield welding gun and the second gas shield welding gun; the oscillator is arranged on the welding trolley, and a double-wire welding gun consisting of a first gas shield welding gun and a second gas shield welding gun is arranged on the oscillator; the gas supply device is connected with the first gas-shielded welding gun, and the input end of the integrated power supply box is also connected with an external power grid to provide an auxiliary power supply for the control box; the control box, the welding trolley and the oscillator are used for completing the control of arc starting and arc stopping;
the homopolar output ends of the first welding power supply and the second welding power supply are connected with the first gas shield welding gun through the integrated power supply box at the same time, the other output end of the first welding power supply is connected with a workpiece to be welded, and the other output end of the second welding power supply is connected with the second gas shield welding gun in a conduction mode;
the oscillator comprises a horizontal sliding block which enables the double-wire welding gun to do linear motion along the direction vertical to the welding seam, and a rotary oscillating head which enables the double-wire welding gun to oscillate in a groove gap of the vertical electro-gas welding;
the gas-shielded welding machine further comprises a cooling water tank and a water-cooling slide block, wherein the cooling water tank is connected with the output end of the integrated power box, the water-cooling slide block is connected with the gas supply device, and the first gas-shielded welding gun, the second gas-shielded welding gun, the water-cooling slide block and the cooling water tank are sequentially connected to form a cooling loop;
the first welding power supply and the second welding power supply are both three-phase power supplies, the integrated power supply box is a communication power supply box, the welding trolley is a vertical electrogas welding trolley, and the gas supply device is a carbon dioxide gas tank or a carbon dioxide and/or argon and other protective mixed gas tank.
A welding method of double-wire vertical electro-gas welding with low welding heat input comprises the steps of enabling a first gas shield welding gun to be close to a part to be welded of a workpiece to be welded, forming a main electric arc at the tail end of the first gas shield welding gun and the surface to be welded of the workpiece to be welded, enabling the tail end of a second gas shield welding gun to be close to the tail end of the first gas shield welding gun, forming an auxiliary electric arc between the tail end of the first gas shield welding gun and the tail end of the second gas shield welding gun, enabling the main electric arc and the auxiliary electric arc to form a composite electric arc, driving the first gas shield welding gun and the second gas shield welding to simultaneously make linear motion along the direction perpendicular to a welding seam through a oscillator, and enabling the first gas shield welding gun and the second gas shield welding gun to swing in a;
the current for melting the first gas shielded welding gun welding wire is I1+ I2, the current for melting the second gas shielded welding gun welding wire is I2, the current for heating the welded workpiece is I1, the total current of the melting welding wire is I1+2 multiplied by I2, the current for generating effective heat input to the welded workpiece is I1, and the polarities and the directions of the currents I1 and I2 are the same, namely the total current of the melting welding wire is larger than the current for generating effective heat input to the welded workpiece;
and welding arcs generated by the first gas shield welding gun and the second gas shield welding gun do linear motion between a forming base plate on the back of the welding seam and a water-cooling forming sliding block on the front of the welding seam, and swing back and forth between a left side plate and a right side plate of a groove vertical to electro-gas welding.
According to the technical scheme, the heat input energy in the welding process can be greatly reduced while the deposition rate of the vertical electro-gas welding is improved, so that the impact toughness of a welding seam is obviously improved, the material cost of welding can be greatly reduced, the heat input of the vertical electro-gas welding is subjected to standard control, the efficient adjustment of the welding heat input is possible, the stability and the reliability of the system are improved, and the controllability of the whole welding system is enhanced; in addition, the double-wire welding gun capable of swinging in the welding seam effectively ensures that the side wall of the welding seam is fully fused with a welding pool, and the mechanical property of the welding seam is obviously improved.
[ description of the drawings ]
FIG. 1 is a block diagram of a low weld heat input twin wire vertical electro-gas welding system according to the present invention;
FIG. 2 is a schematic diagram of the low weld heat input twin wire vertical electro-gas welding system of the present invention;
FIG. 3 is a welding schematic of the low weld heat input twin wire vertical electro-gas welding system of the present invention;
FIG. 4 is a welding schematic of another embodiment of the low weld heat input twin wire vertical electro-gas welding system of the present invention;
FIG. 5 is a swing schematic of the low weld heat input twin wire vertical electro-gas welding system of the present invention;
fig. 6 is a schematic diagram of the welding gun swing of the low welding heat input twin-wire vertical electro-gas welding system of the present invention (fig. 6a is a state diagram of the twin-wire welding gun 1 swinging to the left side of the vertical electro-gas welding groove, fig. 6b is a state diagram of the twin-wire welding gun 1 positioned in the middle of the vertical electro-gas welding groove, and fig. 6c is a state diagram of the twin-wire welding gun 1 swinging to the right side of the vertical electro-gas welding groove).
[ detailed description ] embodiments
The technical scheme of the invention is explained in detail in the following with the accompanying drawings.
Please refer to fig. 1-6 of the specification. In the figure, a first welding power supply 1, a second welding power supply 2, an integrated power supply box 3, a first wire feeder 4, a second wire feeder 5, a first gas-shielded welding gun 6, a second gas-shielded welding gun 7, a cooling water tank 8, a water-cooling slide block 9, a gas supply device 10, a control box 11, a oscillator 12, a welding trolley 13, a main electric arc 61, an auxiliary electric arc 62 and a composite electric arc 63 are arranged.
As shown in fig. 1 and 2:
the invention provides a low-welding heat input double-wire vertical electro-gas welding system which comprises a first welding power supply 1, a second welding power supply 2, an integrated power supply box 3, a first wire feeder 4, a second wire feeder 5, a first gas shield welding gun 6, a second gas shield welding gun 7, a cooling water tank 8, a water-cooling slide block 9, a gas supply device 10, a control box 11, a oscillator 12 and a welding trolley 13. The first welding power supply 1 and the second welding power supply 2 are both three-phase power supplies, are respectively arranged in the first welding machine and the second welding machine, are mainly used for providing working power supplies for double-wire vertical electro-gas welding, and are both connected to the input end of the integrated power supply box 3; the integrated power supply box 3 is a communication power supply box, the output end of the integrated power supply box is connected with a first wire feeder 4 and a second wire feeder 5, and the integrated power supply box is used for intensively outputting and supplying power for simultaneous welding, meanwhile, the input end of the integrated power supply box 3 is also connected with external network power (380V), the output end of the integrated power supply box is also connected with a cooling water tank 8 and a control box 11, and the integrated power supply box 3 provides an auxiliary power supply for the cooling water tank 8 and the control box 11 by the external network power; the first wire feeder 4 and the second wire feeder 5 are respectively connected with a first gas shield welding gun 6 and a second gas shield welding gun 7 through welding gun cables in an external mode for welding in the welding process, the dry elongation distance of welding wires of the two welding guns is constant, and the positions of the welding wires are fixed and the movement tracks of the welding guns are the same; the gas supply device 10 is a carbon dioxide gas tank or a carbon dioxide and/or argon and other protective mixed gas tanks, and is connected with the first gas protection welding gun 6 and the water-cooling slide block 9; the control box 11 is the control core of the double-wire vertical electro-gas welding system with low welding heat input, the integrated power box 3 provides an auxiliary power supply, and the control box 11 sends out a welding time sequence control signal to respectively control the arc striking and arc closing of the welding trolley 13 (vertical electro-gas welding trolley), the oscillator 12, the first welding power supply 1 and the second welding power supply 2, the voltage and the current, and the first wire feeder 4 and the second wire feeder 5.
In the welding process of the system, a first gas shield welding gun 6, a second gas shield welding gun 7 and a welding pool in a welding seam generate a large amount of heat, at the moment, the integrated power supply box 3 supplies power to the cooling water tank 8, and the control box 11 controls the work of the cooling water tank 8; during normal welding, the cooling water tank 8 sends water out through the compressor, the water sequentially passes through the second gas shield welding gun 7, the first gas shield welding gun 6 and the water cooling slide block 9, and finally flows back to the cooling water tank 8 to effectively perform cooling treatment; meanwhile, in the process of realizing welding, the carbon dioxide gas tank 10 supplies protective gas for the first gas shielded welding gun 6 and the water-cooled slide block 9 to protect the metal of the welding pool.
As shown in fig. 3:
the homopolar output ends of a first welding power supply 1 (namely a main electrode) and a second welding power supply 2 (namely an auxiliary electrode) of the low-welding heat input double-wire vertical gas electric vertical welding system are simultaneously in conductive connection with the head end of a first gas shielded welding gun 6 (namely a main arc power supply), the other output end of the first welding power supply 1 is connected with a workpiece 14 to be welded, and the other output end of the second welding power supply 2 is in conductive connection with the head end of a second gas shielded welding gun 7 (namely an auxiliary arc power supply). During welding, the first gas shielded welding gun 6 is close to a part (such as a welding seam) to be welded of the workpiece 14 to be welded, and under the action of the first welding power supply 1, the tail end of the first gas shielded welding gun 6 and the surface to be welded of the workpiece 14 to be welded form a main electric arc 61; meanwhile, the tail end of the second gas shield welding gun 7 is close to the tail end of the first gas shield welding gun 6, under the action of the second welding power supply 2, an auxiliary arc 62 is formed between the tail end of the first gas shield welding gun 6 and the tail end of the second gas shield welding gun 7, and the main arc 61 and the auxiliary arc 62 form a composite arc 63 to realize welding.
At this time, the current flowing through the workpiece 14 is I1, the current flowing through the second gas shield welding gun 7 is I2, the current flowing through the first gas shield welding gun 6 is I1+ I2, i.e., the current for melting the welding wire of the first gas shield welding gun 6 is I1+ I2, the current for melting the welding wire of the second gas shield welding gun 7 is I2, the current for heating the workpiece 14 is I1, the total current for melting the welding wire is I1+2 × I2, the current for generating effective heat input to the workpiece 14 is I1, and the currents I1 and I2 have the same polarity and the same direction, so that the total current for melting the welding wire is greater than the current for generating effective heat input to the workpiece 14, i.e., I1+2 × I2 > I1.
Therefore, the system can greatly reduce the heat input energy in the welding process while improving the deposition rate of the vertical electro-gas welding through the welding method, also realize the greatly improved deposition rate of the welding wire of unit current, obviously improve the impact toughness of the welding line, also greatly reduce the material cost of welding, and carry out standard control on the heat input of the vertical electro-gas welding, so that the efficient adjustment of the welding heat input becomes possible, the stability and the reliability of the system are improved, and the controllability of the whole welding system is enhanced.
As shown in fig. 4:
the welding principle of the low-welding-heat-input double-wire vertical electro-gas welding system is basically the same as that of the embodiment in fig. 3, the homopolar output ends of the first welding power supply 1 and the second welding power supply 2 are simultaneously in conduction connection with the head end of the first gas shielded welding gun 6, the other output end of the first welding power supply 1 is connected with a workpiece 14 to be welded, and the other output end of the second welding power supply 2 is in conduction connection with the head end of the second gas shielded welding gun 7. When in welding, the first gas shielded welding gun 6 is close to a part to be welded of the workpiece 14 to be welded, and under the action of the first welding power supply 1, the tail end of the first gas shielded welding gun 6 and the surface to be welded of the workpiece 14 to be welded form a main electric arc 61; meanwhile, the tail end of the second gas shield welding gun 7 is close to the tail end of the first gas shield welding gun 6, under the action of the second welding power supply 2, an auxiliary arc 62 is formed between the tail end of the first gas shield welding gun 6 and the tail end of the second gas shield welding gun 7, and the main arc 61 and the auxiliary arc 62 form a composite arc 63 to realize welding. The difference lies in that: in the embodiment of fig. 3, the homopolar output ends of the first welding power supply 1 and the second welding power supply 2 which are in conductive connection with the head end of the first gas shielded welding gun 6 are positive electrodes, while in the embodiment of fig. 4, the like output ends are negative electrodes, and in the embodiment of fig. 3, the other output ends of the first welding power supply 1 which is in conductive connection with the welded workpiece 14 and the other output end of the second welding power supply 2 which is in conductive connection with the head end of the second gas shielded welding gun 7 are negative electrodes, while in the embodiment of fig. 4, the like output ends; that is to say, the currents of the two embodiments are in opposite phases, but the currents flowing through the workpiece to be welded 14, the second gas shield welding gun 7 and the first gas shield welding gun 6 are I1, I2 and I1+ I2 respectively, so that the total current of the molten welding wire is larger than the current which can generate effective heat input to the workpiece to be welded 14, the deposition rate of vertical electro-gas welding can be improved, and the heat input energy in the welding process can be greatly reduced.
As shown in fig. 5 and 6:
the oscillator 12 in the low-welding heat input double-wire vertical electro-gas welding system comprises a horizontal sliding block 121 and a rotary oscillating head 122, wherein a double-wire welding gun consisting of a first gas shield welding gun 6 and a second gas shield welding gun 7 is fixed on the oscillator 12, the horizontal sliding block 121 drives the double-wire welding gun to do linear motion along the direction vertical to a welding seam 15, and welding electric arcs generated by the double-wire welding gun can do linear motion between a forming backing plate 151 on the back of the welding seam and a water-cooling forming sliding block 152 on the front of the welding seam; meanwhile, the rotary oscillating head 122 drives the twin-wire welding gun to oscillate in the gap of the vertical electrogas welding groove, that is, the twin-wire welding gun can oscillate back and forth between the left side plate 153 and the right side plate 154 of the vertical electrogas welding groove, that is, the welding arc generated by the twin-wire welding gun oscillates back and forth between the left side plate 153 and the right side plate 154 of the vertical electrogas welding groove, and the welding is performed. Therefore, the side wall of the welding seam can be effectively ensured to be fully fused with the welding pool 155, and the mechanical property of the welding seam is obviously improved.
The foregoing is a more detailed description of the present invention in connection with specific preferred embodiments and is not intended to limit the practice of the invention to these embodiments. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. The utility model provides a perpendicular electrogas welding system of twin-wire of low welding heat input which characterized in that: the welding device comprises a first welding power supply (1), a second welding power supply (2), an integrated power supply box (3), a first wire feeder (4), a second wire feeder (5), a first gas shield welding gun (6), a second gas shield welding gun (7), a gas supply device (10), a control box (11), a oscillator (12) and a welding trolley (13); wherein,
the first welding power supply (1) and the second welding power supply (2) are both connected with the input end of the integrated power supply box (3) and supply welding working power;
the first wire feeder (4), the second wire feeder (5) and the control box (11) are connected with the output end of the integrated power box (3), the first wire feeder (4) and the second wire feeder (5) are respectively connected with the first gas shield welding gun (6) and the second gas shield welding gun (7),
the oscillator (12) is installed on the welding trolley (13), and a double-wire welding gun consisting of the first gas shield welding gun (6) and the second gas shield welding gun (7) is installed on the oscillator (12);
the gas supply device (10) is connected with the first gas-shielded welding gun (6) and the water-cooled sliding block (9), and the input end of the integrated power supply box (3) is also connected with an external power grid to provide an auxiliary power supply for the control box (11);
the control box (11), the welding trolley (13) and the oscillator (12) are used for completing the control of arc starting and arc stopping.
2. The low weld heat input twin wire vertical electrogas welding system of claim 1, wherein: the homopolar output ends of the first welding power supply (1) and the second welding power supply (2) are simultaneously connected with the first gas shield welding gun (6) through the integrated power supply box (3), the other output end of the first welding power supply (1) is connected with a workpiece to be welded (14), and the other output end of the second welding power supply (2) is connected with the second gas shield welding gun (7).
3. The low weld heat input twin wire vertical electrogas welding system of claim 1 or 2, wherein: the oscillator (12) comprises a horizontal sliding block (121) which enables the double-wire welding gun to do linear motion along the direction vertical to the welding seam (15), and a rotary oscillating head (122) which enables the double-wire welding gun to oscillate in the groove gap of the vertical electro-gas welding.
4. The low weld heat input twin wire vertical electrogas welding system of claim 1, wherein: still including coolant tank (8) and water-cooling slider (9), coolant tank (8) with the output of integrated power pack (3) is connected, water-cooling slider (9) with air feeder (10) are connected, and first gas is protected welder (6), second gas and is protected welder (7), water-cooling slider (9) and coolant tank (8) and connect gradually, form cooling circuit.
5. The low weld heat input twin wire vertical electrogas welding system of claim 1, wherein: the welding device is characterized in that the first welding power supply (1) and the second welding power supply (2) are three-phase power supplies, the integrated power supply box (3) is a communication power supply box, the welding trolley (12) is a vertical electrogas welding trolley, and the gas supply device (10) is a carbon dioxide gas tank or a carbon dioxide and/or argon and other protective mixed gas tanks.
6. A welding method of double-wire vertical electro-gas welding with low welding heat input comprises the steps of enabling a first gas shielded welding gun (6) to be close to a part to be welded of a workpiece (14) to be welded, a main electric arc (61) is formed at the tail end of the first gas shielded welding gun (6) and the surface to be welded of the workpiece (14) to be welded, and the tail end of the second gas shield welding gun (7) is close to the tail end of the first gas shield welding gun (6), forming an auxiliary arc (62) between the end of the first gas shield welding torch (6) and the end of the second gas shield welding torch (7), the main arc (61) and the auxiliary arc (62) form a composite arc (63) and, at the same time, the oscillator (12) drives the first gas shield welding gun (6) and the second gas shield welding gun (7) to simultaneously do linear motion along the direction vertical to the welding seam (15) and oscillate in the groove gap of the vertical electro-gas welding to realize welding.
7. The welding method according to claim 6, characterized in that: the current for melting the welding wire of the first gas shielded welding gun (6) is I1+ I2, the current for melting the welding wire of the second gas shielded welding gun (7) is I2, the current for heating the workpiece to be welded (14) is I1, the total current for melting the welding wire is I1+2 multiplied by I2, the current for generating effective heat input to the workpiece to be welded (14) is I1, and the polarities and directions of the currents I1 and I2 are the same, namely the total current for melting the welding wire is larger than the current for generating effective heat input to the workpiece to be welded (14).
8. The welding method according to claim 6, characterized in that: and welding arcs generated by the first gas shield welding gun (6) and the second gas shield welding gun (7) do linear motion between a forming backing plate (151) on the back of the welding seam and a water-cooling forming sliding block (152) on the front of the welding seam, and swing back and forth between a left side plate (153) and a right side plate (154) of a groove vertical to electrogas welding.
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| CN102941393A (en) * | 2012-11-23 | 2013-02-27 | 南京奥特电气股份有限公司 | Circumferential seam single-pass electro-gas welding machine |
| CN103264206A (en) * | 2013-05-10 | 2013-08-28 | 深圳市瑞凌实业股份有限公司 | Welding method and welding device for single-gun twin-wire perpendicular gas electric welding gun |
| CN103341681A (en) * | 2013-06-26 | 2013-10-09 | 哈尔滨工业大学 | Multi-state double-wire electrical arc welding device and welding method |
| CN103706930A (en) * | 2013-12-11 | 2014-04-09 | 江门市保值久机电有限公司 | Portable multi-functional gas shielded welding gun |
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Application publication date: 20120718 |