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Influence of welding angle on the weld morphology and porosity in laser-arc hybrid welding of AA2219 aluminum alloy

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Abstract

The influence of welding angle on weld morphologies and porosity characteristics was studied in laser-arc hybrid welding of AA2219 aluminum (Al) alloy. The upward sloping and vertical weld (USVW) was performed better than the downward sloping and vertical weld (DSVW). The high-speed camera was used to observe the welding process. It is found that the welding process becomes stable when the transitional position of the droplet was 2 mm away from the keyhole. By analyzing the force act on keyhole and characteristics of the pool, it is found that the weld morphologies and porosity characteristics were associated with gravity-laser angle (β), which affects the keyhole stability and characteristics of the pool. The results showed that the flow velocity was accelerated when the β increased, which was a benefit for decreasing porosity. This is because the gravity in the direction of the welding accelerates the pool flow. Due to the increasing of the β, the static pressure and the vapor pressure in the keyhole were increased, which improved the stability of the keyhole and decreased the porosity.

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Funding

This work is financially supported by the National Natural Science Foundation of China with grant nos. 51805182 and 51429501, and the China Postdoctoral Science Foundation funded project with grant no. 2018 M642828.

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Authors and Affiliations

  1. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China

    Cong Chen, Ming Gao & Xiaoyan Zeng

  2. Shanghai Spaceflight Precision Machinery Institute, Shanghai, 201600, People’s Republic of China

    Yiping Shen

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  1. Cong Chen
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  2. Yiping Shen
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  3. Ming Gao
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  4. Xiaoyan Zeng
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Correspondence to Ming Gao.

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Chen, C., Shen, Y., Gao, M. et al. Influence of welding angle on the weld morphology and porosity in laser-arc hybrid welding of AA2219 aluminum alloy. Weld World 64, 37–45 (2020). https://doi.org/10.1007/s40194-019-00818-w

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  • DOI: https://doi.org/10.1007/s40194-019-00818-w

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