Bottoming welding method of laser-hot wire MIG composite based on light beam scanning

Abstract

The invention provides a bottoming welding method of laser-hot wire MIG composite based on light beam scanning, relates to the field of laser-hot wire MIG composite welding, and solves the problem that liquid metal welding joint back surface is prone to forming an indent when an existing laser-hot wire MIG welding performs bottoming welding. Bottoming welding is carried out on laser beam and hot wire MIG electric arc composite, wherein the laser beam scans along a certain track, and the hot wire MIG electric arc composite is protected by insert gas. The laser beam and the electric arc act in awelding pool, the power, scanning frequency and laser swing of the laser beam are matched reasonably to achieve a certain stirring action for the welding pool, the stress state of the welding pool ischanged, and the bottoming welding of welded workpieces is completed. The bottoming welding method of the laser-hot wire MIG composite based on the light beam scanning has the beneficial effects thatthe stirring action is achieved for the laser scanning, the stress state of the welding pool is changed, the resistance of the liquid metal flowing to a groove root portion is reduced, the forming effect of the welding joint back surface is improved, and the forming of the welding joint back surface is quite attractive and the spread-ability of the welding joint is good.

Description

technical field [0001] The invention relates to a laser-hot wire MIG composite backing welding technology. Background technique [0002] Because TIG welding is protected by pure Ar, the welding process is stable, the weld shape is beautiful, the weld metal is clean, and the metallurgical performance of the welded joint is high. For TIG root welding, in order to ensure the penetration and back forming of the weld root, the following two methods are mainly used: [0003] (1) Larger groove angle (60°-70°), resulting in low welding efficiency, large consumption of welding materials, large welding heat input, and easily lead to large welding deformation; [0004] (2) A certain gap needs to be left at the root of the groove. The uneven size of the gap will directly affect the penetration of the root of the weld and the formation of the back. ; [0005] Therefore, with the rapid development of my country's aviation, aerospace, nuclear power and other fields, TIG welding methods ...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve the problem that the back of the liquid metal weld is easy to form concave during the existing laser-hot wire MIG welding bottoming welding, and proposes a laser-hot wire MIG composite bottoming based on beam scanning Welding method

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