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Microstructure and mechanical property in laser welding-brazing of stainless steel and titanium alloy using 63Sn-37Pb alloy as filler metal

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Abstract

Laser welding-brazing of TC4 titanium (Ti) alloy to 304 stainless steel (SS) has been applied using 63Sn-37Pb alloy as filler metal. A new welding process for SS-Ti alloy joint was introduced on the basis of the controlling the formation of Ti–Fe intermetallics in the joint. One process was one pass welding involving creation of a joint with one fusion weld and one brazed weld separated by remaining unmelted SS. When laser beam on the SS side was 1.4 mm, SS would not be completely melted in joint. Through heat conduction of unmelted SS, the filler metal melted occurred at the SS-Ti alloy interface. A brazed weld was formed at the SS-Ti alloy interface with the main microstructure of Fe3Sn+Fe3Sn2, (βSn, Pb), (βSn)+Sn2Fe, and (βSn)+Sn3Ti2. The joint fractured at the brazed weld with the maximum tensile strength of 108 MPa.

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Authors and Affiliations

  1. School of Mechanical Engineering, Xinjiang University, Wulumuqi, 830000, China

    Yan Zhang, YanKun Chen & JianPing Zhou

  2. Key Laboratory of Automobile Materials, School of Materials Science and Engineering, Jilin University, Changchun, 130022, China

    DaQian Sun & HongMei Li

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  1. Yan Zhang
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  2. YanKun Chen
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  3. JianPing Zhou
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  4. DaQian Sun
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  5. HongMei Li
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Correspondence to Yan Zhang.

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Recommended for publication by Commission XVII - Brazing, Soldering and Diffusion Bonding.

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Zhang, Y., Chen, Y., Zhou, J. et al. Microstructure and mechanical property in laser welding-brazing of stainless steel and titanium alloy using 63Sn-37Pb alloy as filler metal. Weld World 64, 257–266 (2020). https://doi.org/10.1007/s40194-019-00827-9

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  • DOI: https://doi.org/10.1007/s40194-019-00827-9

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