Effects of Nanosecond Laser Scanning Paths on Weld Formation, Microstructure and Mechanical Properties of Dissimilar Ultra-Thin Al/Cu Foil Nanosecond Laser Welded Joints
Effects of Nanosecond Laser Scanning Paths on Weld Formation, Microstructure and Mechanical Properties of Dissimilar Ultra-Thin Al/Cu Foil Nanosecond Laser Welded Joints
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DOI：
10.1007/s11665-023-08806-4
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发表时间：
2023-10
影响因子：
2.3
通讯作者：
Xiao-Nan Wang;Jia-Le Wang;Qian Sun;Xiaoqi Tang;Xiang Li;Katoh Akira;Peng-Cheng Huan
中科院分区：
文献类型：
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作者：
Xiao-Nan Wang;Jia-Le Wang;Qian Sun;Xiaoqi Tang;Xiang Li;Katoh Akira;Peng-Cheng Huan
采用纳秒激光焊接35μm厚的铜和100μm厚的铝箔。研究了纳秒激光扫描路径对焊缝成形、显微组织和力学性能的影响。结果表明：多边形纳秒激光扫描路径焊缝成形呈现明显的各向异性；两种扫描路径纳秒激光焊接接头的显微组织相似，主要由柱状γ-Cu9Al4、块状θ-CuAl2相和网状θ-CuAl2+ α-Al共晶相组成。在Al/Cu纳秒激光焊接接头的拉剪试验中，应力集中沿界面处块状θ- cual2的脆性金属间化合物（IMCs）开始萌生裂纹，裂纹沿网状θ- cual2扩展，最终发生断裂破坏。考虑到焊接效率和力学性能，推荐采用螺旋扫描路径。
A nanosecond laser is used to weld 35μm thickness copper and 100μm thickness aluminum foil. The influence of nanosecond laser scanning paths on the weld formation, microstructure and mechanical properties is investigated. The results show that the weld formation of the polygonal nanosecond laser scanning path presents obvious anisotropy. The microstructures of the nanosecond laser welded joints of the two scanning paths are similar, mainly composed of the columnar γ-Cu9Al4, blocky θ-CuAl2phase and reticular θ-CuAl2+ α-Al eutectic phase. During the tension-shear test of the Al/Cu nanosecond laser welded joint, stress concentration and crack initiation begin to occur along the brittle intermetallic compounds (IMCs) of massive θ-CuAl2at the interface, and then, the crack propagates along the reticular θ-CuAl2and finally fracture failure occurs. Considering the welding efficiency and mechanical properties, a spiral scanning path is recommended.