Influence of Beam Swing Mode on Cracks of Double-sided Laser Welding of 2195 Aluminum-lithium Alloy T-joint

doi:10.3901/JME.2023.22.245

Abstract

Abstract: 2195 aluminum-lithium alloy has the characteristics of light weight, high strength, good low temperature mechanical properties and corrosion resistance. It belongs to a new generation of aerospace materials. However, aluminum-lithium alloy is sensitive to thermal cracks and is difficult to weld. The new technology of double-sided laser swing welding is used to join the 2195 aluminum-lithium alloy T-joint, and the effects of three kinds of beam swing modes, including vertical swing, circular swing and no swing, on joint welding cracks and joint microstructure, cross-sectional Si element distribution, molten pool dynamic behavior and welding thermal cycle characteristics are studied. The results show that 2195 aluminum-lithium alloy is prone to crystal crack defects during the welding process. Laser swing welding can promote the uniform distribution of Si element introduced into the weld by the welding wire, refine the weld structure, and reduce the welding heat input, which has a good thermal crack suppression effect with Al-Si welding wire. The circular swing method has the most significant effect, which has the best grain refinement effect, the most evenly distributed Si element in the cross section, the lowest welding heat input, and is basically free of thermal cracks.

Key words: aluminum-lithium alloy T-joint, double-sided laser swing welding, cracks, microstructure

CLC Number:

TG456

BI Siyuan, ZHANG Xinrui, LEI Zhenglong, LI Bingwei, XIA Peiyun. Influence of Beam Swing Mode on Cracks of Double-sided Laser Welding of 2195 Aluminum-lithium Alloy T-joint[J]. Journal of Mechanical Engineering, 2023, 59(22): 245-253.

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