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Interface homogenization and its relationship with tensile properties of laser-arc hybrid welded Al/steel butt-joint via beam oscillation

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Abstract

Homogenized intermetallic compound (IMC) layer at interface was achieved in laser-arc hybrid butt welded Al/steel dissimilar metals through beam oscillation. The beam oscillation reduced the macrosegregation of Fe element in the weld, which increased the uniformity of IMC layer by 443 times as its thickness variance (δ) decreased from 0.9767 to 0.0022. It was found that the tensile properties of weld were not only related to the thickness (τ) of IMC as claimed in most previous literatures, but also linked with its uniformity along interface. A new relationship between interface uniformity and tensile properties was established based on quantitative analysis of interface homogenization. The ultimate tensile strength was more than 130 MPa when δ ≤ 0.1156 and 0.9 μm ≤ τ ≤ 1.8 μm. Beam oscillation not only homogenized melt flow in molten pool, but also promoted to form turbulent flows at interface, which benefited for the interface homogenization.

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Acknowledgements

The study is supported by the National Natural Science Foundation of China (Nos. 51775206 and 51805182), and the China Postdoctoral Science Foundation (No. 2020M682409).

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Authors and Affiliations

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

    Ming Gao, Yazhou Zhang & Yunfei Meng

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  1. Ming Gao
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  2. Yazhou Zhang
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  3. Yunfei Meng
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Correspondence to Yunfei Meng.

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Handling Editor: Naiqin Zhao.

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Gao, M., Zhang, Y. & Meng, Y. Interface homogenization and its relationship with tensile properties of laser-arc hybrid welded Al/steel butt-joint via beam oscillation. J Mater Sci 56, 14126–14138 (2021). https://doi.org/10.1007/s10853-021-06234-0

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  • DOI: https://doi.org/10.1007/s10853-021-06234-0