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A circular seam laser-tig composite welding device and its application method

A hybrid welding and laser technology, used in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of incomplete fusion of the back of the girth weld, poor mechanical properties of the weld, and large heat input of the base metal, and reduce heat Input, improve mechanical properties, increase the effect of welding penetration

Active Publication Date: 2022-05-24
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of lack of fusion and incomplete penetration of the back of the girth weld in the prior art, and the increase of the welding current in order to increase the cladding amount of the filler metal, the heat input to the base metal is large, the deformation is large, and the mechanical properties of the weld are poor. Problem, the present invention provides a circular seam laser-TIG composite welding device and its use method, the core of which is to use two TIG welding torches and a hot wire power supply to generate multiple arcs with different positions and functions, which can not only melt the welding wire efficiently, but also , can also directly act on the back of the workpiece in the laser action area to improve the laser energy absorption rate of the welded workpiece

Method used

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  • A circular seam laser-tig composite welding device and its application method
  • A circular seam laser-tig composite welding device and its application method
  • A circular seam laser-tig composite welding device and its application method

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Effect test

Embodiment 1

[0034] like figure 1 As shown, a circumferential seam laser-TIG hybrid welding device includes a first TIG power source 9, a first TIG welding gun 1, a second TIG power source 11, a second TIG welding gun 2, a hot wire power source 10 and a welding laser head, wherein, The welding laser head is placed directly above the 12 o'clock direction of the girth weld base material 8, and emits the laser beam 5 vertically downward. The negative pole of the power supply 9 is electrically connected, and the positive pole of the first TIG power supply 9 is electrically connected to the girth weld base metal 8, so that the first TIG arc 12 is formed under the irradiation point of the laser beam 5, thereby improving the absorption rate of the laser energy by the base metal. ;

[0035] Along the welding direction, the second TIG welding torch 2 is arranged in front of the laser beam 5, and is electrically connected to the negative electrode of the second TIG power source 11, and the positive...

Embodiment 2

[0049] This embodiment preferably defines a parameter of the method used in Embodiment 1, the power of the laser beam 5 is 1kW-10kW, the welding current provided by the first TIG power source 9 to the first TIG welding torch 1 is 10-80A, The current of the hot wire power source 10 is 10-200A, the welding current of the second TIG power source 11 is 50-300A, and the welding speed is 0.05-2m / min.

Embodiment 3

[0051] This embodiment preferably defines another parameter of the method used in Embodiment 1. Both the laser beam 5 and the first TIG welding torch 1 are at 90° to the horizontal direction, and the angle α between the second TIG welding torch 2 and the horizontal direction is is 60°-90°, and the included angle β between the welding wire 7 and the horizontal direction is 20°-70°.

[0052] The method of the present invention is compared with the existing conventional laser-GMA hybrid welding method, as shown in the appendix. figure 2 -Attached Figure 5 shown, figure 2 It is a schematic diagram of the weld cross-section of the conventional laser-GMA hybrid welding method of the circumferential seam. It can be seen that there are welding defects without penetration at the bottom of the weld and undercut welding defects on the left side of the weld surface; image 3 It is a schematic diagram of the longitudinal section of the welding seam of the conventional laser-GMA hybrid...

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Abstract

A circular seam laser-TIG composite welding device and its use method, the welding laser head is placed directly above the 12 o'clock direction of the base metal of the girth weld, and the laser beam is emitted vertically downward, and the first TIG welding torch is arranged below the base material of the girth weld , and is electrically connected with the negative pole of the first TIG power supply, the positive pole of the first TIG power supply is electrically connected with the base metal of the girth weld; the second TIG welding torch is arranged in front of the laser beam, and is electrically connected with the negative pole of the second TIG power supply, and the second TIG welding torch is electrically connected with the negative pole of the second TIG power supply. The positive pole of the second TIG power supply is electrically connected to the base metal of the circumferential weld; the welding wire is located in front of the second TIG welding torch, and the welding wire is electrically connected to the positive pole of the hot wire power supply, and the negative pole of the hot wire power supply is electrically connected to the second TIG welding torch. The invention uses two TIG welding torches and a hot wire power supply to generate multiple arcs with different positions and functions, which can not only melt the welding wire efficiently, but also directly act on the back of the workpiece in the laser action area to improve the laser energy absorption rate of the welded workpiece.

Description

technical field [0001] The invention relates to the field of laser-TIG composite welding, in particular to a circular seam laser-TIG composite welding device and a using method. Background technique [0002] Girth weld joints are widely used in the welding of petroleum pipelines, pressure vessels and storage tanks, etc. For pipeline girth welds, manual welding and MIG automatic welding are usually used. However, this process requires the processing of larger grooves, the weld requires a large amount of filler metal, and the welding strength is high, and it is easy to cause problems of pre-weld preheating, post-weld heat treatment, and post-weld correction and deformation. [0003] In the field of girth welding, the laser-GMA hybrid welding process is mainly used. The laser-GMA hybrid welding process can keep the welding base metal rotating, the laser beam is perpendicular to the welding level, and then the laser-GMA is at the highest point of the girth weld at 12 points. Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/348
CPCB23K26/348
Inventor 彭进
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER