Suppressing porosity of a laser keyhole welded Al-6Mg alloy via beam oscillation

被引:86
作者
Zhang, Chen [1 ]
Yu, Yan [2 ]
Chen, Cong [2 ]
Zeng, Xiaoyan [2 ]
Gao, Ming [2 ]
机构
[1] Wuhan Univ, Inst Technol Sci, Wuhan 430072, Peoples R China
[2] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Peoples R China
基金
中国国家自然科学基金;
关键词
Laser welding; Aluminum alloys; Laser beam oscillation; Porosity; ALUMINUM-ALLOYS;
D O I
10.1016/j.jmatprotec.2019.116382
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Oscillating laser beam was utilized to weld the Al-6Mg aluminum alloys. The porosity of the welds with different parameters were investigated. The higher values of oscillation frequency and oscillation amplitude were more effective for pore suppression. A wide range of oscillation frequency thresholds for different oscillation amplitudes that meet industrial porosity standards (below 1%) was found. The essential effect of this oscillation is to change the laser-induced keyhole velocity. There are more general rules when considering the keyhole velocity. An average keyhole velocity above 70 m/min completely inhibits the pores. The keyhole velocity threshold for pore suppression is nearly linearly correlated with the oscillation amplitude, for the keyhole velocity in the 30-70 m/min range. The lower porosity induced by oscillating laser beam improved the tensile strength of the lock butt weld, which was 36.3% higher than that of the weld without oscillation.
引用
收藏
页数:7
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