Abstract
Wire-feeding laser welding of copper/stainless steel was carried out by filling nickel-based welding wire. ANSYS finite element numerical simulation software was used to analyze the temperature field of the joint, the diffusion of interface elements and the microstructure of the joint were studied. The influence of welding power on joint microcracks is analyzed. The study found that as the welding power increased, the cooling rate of the joint decreased, and the temperature gradient on the copper side weld decreased. This promoted the transformation of columnar dentrites on the copper side to equiaxed dentrites and effectively suppressed microcracks in the weld. In order to show the fracture mechanism of the joint, digital image correlation technology (DIC) is used to analyze the local mechanical behavior of the joint. The weld joint had achieved the ultimate tensile strength (UTS) of 239.5±2.11 MPa, which is 84.8% of the strength of the copper base metal and all the joints were fractured in the Cu-HAZ, the fracture mode was ductile fracture.
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Gu, X., Cui, Z., Shao, J. (2021). Microstructure and Performance Control of Copper/Stainless Steel Wire-Feeding Laser Welding Joint. In: Zheng, L., Sun, C., Goh, KL. (eds) Proceedings of MEACM 2020. MEACM 2020. Mechanisms and Machine Science, vol 99. Springer, Cham. https://doi.org/10.1007/978-3-030-67958-3_33
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DOI: https://doi.org/10.1007/978-3-030-67958-3_33
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