Laser high-frequency alternating-current pulse tungsten inert gas (TIG) hybrid welding process

Abstract

The invention discloses a laser high-frequency alternating-current pulse tungsten inert gas (TIG) hybrid welding process. The process comprises the following steps of: constructing a laser high-frequency alternating-current pulse TIG hybrid welding system, and gathering an TIG arc and a semiconductor laser beam on the same welding position of a welded workpiece 8 in the same welding direction, to form a molten bath, wherein an inclined angle alpha of 10-40 degrees is formed between the TIG arc tungsten electrode tip end and a vertical direction, the semiconductor laser beam forms an included angle beta of 10-30 degrees with the vertical direction, the TIG arc tungsten electrode tip end keeps a vertical distance H of 2-4mm with the surface of the welded workpiece 8, and the TIG arc tungsten electrode tip end and the semiconductor laser beam keep a horizontal distance D of 2-5mm with an action point of the surface of the welded workpiece 8. The process disclosed by the invention can refine weld microstructure, remarkably reduce or eliminate pores in melting area and effectively improve mechanical performance and anti-stress corrosion performance of a high-strength aluminous alloy welding joint, and the process is quite practical.

Description

technical field [0001] The invention relates to a laser high-frequency composite welding process, in particular to a laser high-frequency AC pulse TIG composite welding process. Background technique [0002] 2A14 and 2219 aluminum alloys are the main structural materials of my country's aerospace products. As one of the core technologies of aerospace manufacturing, their welding processes and methods need continuous breakthroughs and improvements with the continuous improvement of product performance and requirements and the development of material technology. [0003] At present, most of the large structures of 2A14 and 2219 aluminum alloys still adopt the traditional TIG welding process, and some structural welds adopt more advanced special welding processes such as friction stir welding, variable polarity plasma welding, and vacuum electron beam welding. However, due to the limitation of product structure and welding position, there are still a large number of welds that...

AI Technical Summary

Problems solved by technology

However, the use of laser welding for aerospace high-strength aluminum alloys (such as 2A14, 2219, etc.) has great limitations: such as high reflectivity of materials to laser light, poor joint performance, and unstable welding quality.

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