Narrow gap laser-arc hybrid welding method using filler wire

Abstract

The invention relates to a narrow gap laser-arc composite welding method adopting a filler wire, belonging to the technical field of laser materials processing. The method adopts a high-power laser and an laser arc hybrid, and the arrangement mode thereof is that a laser bean and a welding wire are arranged in opposite directions corresponding to an electric arc, wherein the laser bean enters slantwise from the front part of the electric arc, and the welding wire is led into a divided edge gap from the rear of the electric arc, and after fusing the welding wire, a composite thermal source fills the gap, thereby realizing the single pass welding shaping of a work piece. The method fully utilizes the penetration fusion property of the laser and the high filling efficiency of the electric arc; and under the mutual actions of laser and arc, the stability of a welding process is improved, and the welding efficiency is increased.

Description

technical field [0001] The invention discloses a narrow-gap laser-arc composite welding method using filler wire, which belongs to the technical field of laser material processing. Background technique [0002] With the increasingly large-scale and high-parameterization of transportation, energy, nuclear power, aviation, aerospace and other industrial equipment, the application of thick (ultra-thick) plate welding structures is becoming more and more extensive, and more and more requirements are put forward for welding deformation and joint quality. higher requirements. [0003] Non-melting inert gas welding (GTAW), melting inert / active gas shielded welding (GMAW), submerged arc welding (SAW) and other processes currently used in thick plate welding require a larger opening when welding large thick plates Groove, many welding passes, wide welding heat-affected zone, large welding residual stress, large welding deformation, low welding efficiency, etc., limit the application...

AI Technical Summary

Problems solved by technology

But its disadvantage is that the droplet transfer during welding affects the stability of the arc, the stability of the welding process is difficult to guarantee, and there are even a large number of pores, and the quality of the joint is not high

In this case, the arc adversely affects the laser beam, resulting in a limited welding depth, with a single pass thickness not exceeding 8mm

For welding structures with a thickness exceeding 8mm, laser-MIG / MAG hybrid welding needs to adopt multi-layer welding, the welding process will become very complicated, and the joint quality is difficult to meet the use requirements

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