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<p>Welding tungsten to copper has been challenging due to their vast physical differences. This is due to direct fusion welding of W and Cu may compromise joint mechanical properties due to the formation of brittle intermetallic compounds. Consequently, strategies for controlling intermetallic compounds to enhance joint mechanical properties have received significant research attention. In this study, W/Cu dissimilar materials were welded using Ni as a mesosphere via laser welding. The effect of laser power of fiber laser (1500, 1750, and 2000 W) on joint quality was investigated at a constant welding speed of 2 mm/s; joint organization and morphology were analyzed using XRD, OM, SEM, and EDS. Results indicate the optimal power was 1750 W, with preliminary phases identified as NiW and Ni<sub>4</sub>W. Laser fusion brazing occurred near the Cu side, while laser deep fusion brazing occurred near W. Laser power affected the shear strength of W/Ni/Cu joints, initially rising 4.1% then falling 1.7%, with a maximum measured interfacial shear strength of 178 MPa demonstrating good bonding strength.</p>

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Effect of laser power on microstructure and mechanical properties of W/Ni/Cu laser welded joints

  • 期刊论文

  • 发表日期：

    2025年2月17日

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  • Dashuang Liu,
  • Chun Li,
  • Ping Wei,
  • Zhihui Dong,
  • Xionghui Li,
  • Anzhe Shen

摘要

Welding tungsten to copper has been challenging due to their vast physical differences. This is due to direct fusion welding of W and Cu may compromise joint mechanical properties due to the formation of brittle intermetallic compounds. Consequently, strategies for controlling intermetallic compounds to enhance joint mechanical properties have received significant research attention. In this study, W/Cu dissimilar materials were welded using Ni as a mesosphere via laser welding. The effect of laser power of fiber laser (1500, 1750, and 2000 W) on joint quality was investigated at a constant welding speed of 2 mm/s; joint organization and morphology were analyzed using XRD, OM, SEM, and EDS. Results indicate the optimal power was 1750 W, with preliminary phases identified as NiW and Ni4W. Laser fusion brazing occurred near the Cu side, while laser deep fusion brazing occurred near W. Laser power affected the shear strength of W/Ni/Cu joints, initially rising 4.1% then falling 1.7%, with a maximum measured interfacial shear strength of 178 MPa demonstrating good bonding strength.