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

被引：0
|
作者：
Bi S. [1 ]
Zhang X. [1 ]
Lei Z. [1 ]
Li B. [1 ]
Xia P. [2 ]
机构：
[1] State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin
[2] Shanghai Aerospace Equipment and Manufacturer Co., Ltd., Shanghai
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2023年 / 59卷 / 22期
关键词：
aluminum-lithium alloy T-joint; cracks; double-sided laser swing welding; microstructure;
D O I：
10.3901/JME.2023.22.245
中图分类号：
学科分类号：
摘要：
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. © 2023 Chinese Mechanical Engineering Society. All rights reserved.
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页码：245 / 253
页数：8
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