Effect of beam oscillation frequency on porosity in laser welding of aluminum alloy lap-butt joints

Author:

Tan Zhuoming1,Zhang Zhao1,Liu Fuyun2,Qin Xudong1,Zhou Xiaohui2,Gao Peixin1,Yu Tao1,Tan Caiwang2

Affiliation:

1. School of Electromechanical and Automotive Engineering, Yantai University, Yantai, PR China

2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, China

Abstract

Many investigations into laser oscillations for mitigating severe porosity in aluminum alloys have involved trading off penetration depth, potentially disrupting the porosity suppression mechanism. In this study, an oscillation laser butt-lap welding technique was designed, and the effect of oscillation frequency on cross-section morphologies and porosity rate was investigated while maintaining the constant weld depth. The findings unveiled that heightened oscillation frequencies led to diminished porosity levels, and this pattern remained consistent, even in cases where weld depths were extended. High-frequency laser beam oscillation enhanced the stability of the keyhole, increased the duration of the molten pool existence, and reduced porosity to 0.17%. Thus, this study offered significant insights into the impact of oscillation on laser welding of aluminum alloys.

Funder

Science Fund of Shandong Laboratory of Advance Materials and Green Manufacturing

Taishan Scholar Foundation of Shandong Province

Youth innovation technology project support program of Shandong institutions of higher education

Natural Science Foundation for Excellent Young Scholars of Shandong Province

Publisher

SAGE Publications

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