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Numerical and experimental investigation of vacuum-assisted laser welding for DP590 galvanized steel lap joint without prescribed gap

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Abstract

The high-pressurized zinc vapor, which was developed at the interface of the two metal sheets due to the lower boiling point of zinc (around 906 °C) than the melting point of steel (over 1500 °C), led to the formation of macro-blowholes. Vacuum-assisted laser welding was a powerful approach to obtain a defect-free weld bead. The laser welding process was simulated to observe the dynamic or zinc vapor. The stability of laser welding was analyzed according to simulated results. The zinc distribution which was measured by EDS experiment also represented the influence of ambient pressure on welding stability. The bearing load for weld beads under different ambient pressure was measured by shear strength test. A defect-free continuous laser weld bead could be obtained under 3 kPa ambient pressure.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 51323009) and the National Natural Science Foundation of China (Grant No. 51375191). We would like to express our deep gratitude to the Analysis and Test Center of HUST (Huazhong University of Science and Technology), for their friendly cooperation.

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Authors and Affiliations

  1. State Key Laboratory of Material Processing and Die & Mould Technology of HUST, Huazhong University of Science and Technology, Wuhan, China

    Chunming Wang, Bin Lei, Xiang Xu & Gaoyang Mi

  2. State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, China

    Ping Jiang

Authors
  1. Chunming Wang
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  2. Bin Lei
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  3. Ping Jiang
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  4. Xiang Xu
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  5. Gaoyang Mi
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Corresponding author

Correspondence to Gaoyang Mi.

Electronic supplementary material

Video 1

Dynamic keyhole geometry since welding beginning to 2 s after that. (a: 100 kPa, b:10 kPa, c:3 kPa) (AVI 1572 kb)

b (AVI 905 kb)

c (AVI 803 kb)

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Wang, C., Lei, B., Jiang, P. et al. Numerical and experimental investigation of vacuum-assisted laser welding for DP590 galvanized steel lap joint without prescribed gap. Int J Adv Manuf Technol 94, 4177–4185 (2018). https://doi.org/10.1007/s00170-017-1067-6

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  • DOI: https://doi.org/10.1007/s00170-017-1067-6

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