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High power CW YAG laser weldability of dissimilar Ti to Ni metal plates through beam shift

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Abstract

Incompatibilities of thermo-physical-mechanical as well as metallurgic properties between dissimilar Ti and Ni metals present technical challenges to their fusion joining. In this manuscript, using a high power continuous wave (CW) YAG laser, a direct butt welding of Ti and Ni plates was performed with a relatively large beam offset from the contact interface between two base metals (BMs) toward either side of the BMs. As a result, a large amount of rapidly solidified non-equilibrium solid solution occurred in the main fusion zone (FZ); while the total amount of prior intermetallic compounds (IMCs) such as Ti2Ni, Ni3Ti and NiTi significantly decreased, most of which were primarily located as a band (less than 200 μm wide) along one of the fusion interfaces with the BMs. When the laser beam was shifted 0.5 mm toward the Ni side, the toughness of the FZ was sufficiently improved, leading to a crack-free joint. In this study, the microstructures, chemical compositions, and microhardness in the laser-welds thus obtained were examined to learn the influences of beam offset on laser weldability of Ti to Ni metals.

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Acknowledgments

The authors would like to thank Dr. A. Khalifa, CNL, Chalk River, for his participation of this work, and Mr. A. Kittmer, CNL, Chalk River, for the preparation of the metal plates for laser beam welding.

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Authors and Affiliations

  1. Automotive & Surface Transportation Research Centre, National Research Council Canada, 800 Collip Circle, London, Ontario, N6G 4X8, Canada

    Jianyin Chen, Lijue Xue & Glen Campbell

  2. Canadian Nuclear Laboratories, 286 Plant Road, Chalk River, Ontario, K0J 1J0, Canada

    Mitch King

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  1. Jianyin Chen
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  2. Lijue Xue
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Correspondence to Jianyin Chen.

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Chen, J., Xue, L., King, M. et al. High power CW YAG laser weldability of dissimilar Ti to Ni metal plates through beam shift. Int J Adv Manuf Technol 104, 489–501 (2019). https://doi.org/10.1007/s00170-019-03870-4

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  • DOI: https://doi.org/10.1007/s00170-019-03870-4

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