Effect of Different Molten Pool on Microstructure and Properties of Aluminum-Copper Laser Weld Joint
DENG Chengmin1, CHENG Donghai2, CHEN Guocai3, LI Dongyang3, LI Wenjie3, CHEN Yiping3, HU De’an3
1 Beijing Key Laboratory of Optical, Mechanical and Electrical Equipment Technology, Beijing Institute of Petroleum and Chemical Engineering,Beijing 102617, China 2 Beijing Institute of Work Safety Engineering Technology, Beijing 102617, China 3 School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China
Abstract: T2 copper plate and 2A16 aluminum alloy plate were welded by laser beam welding with fusion mode and fusion brazing mode, the mechanical properties of the joint were analyzed, and the microstructure and interface morphology of the joint were studied. The effect of morphology of molten pool on the microstructure and properties of the joint were described. The results show that the molten pool is obtained by laser fusion welding, when the welding energy Q=1 160 J/cm, the interface layer is composed of Al4Cu9+Al2Cu compound and (α-Al)+(θ-Al2Cu) eutectic structure with a total thickness of 60.9 μm. The molten pool is obtained by laser welding-braing, when Q=1 466.67 J/cm, the tensile strength of joint is 274.25 MPa, which is 280.9% higher than that of fusion welding joint, the interfacial layer is composed of CuZn5 and Al2Cu compounds with a total thickness of 10.23 μm. The thickness of IMC layer is affected by the diffusion coefficient (Dfusion-welding > Dwelding-braing)and annular convection under different molten pool shapes, which determines the performance of the joint.
邓呈敏, 程东海, 陈国财, 李东阳, 李文杰, 陈益平, 胡德安. 熔池形态对铝-铜激光焊接头组织和性能的影响[J]. 材料导报, 2021, 35(20): 20052-20056.
DENG Chengmin, CHENG Donghai, CHEN Guocai, LI Dongyang, LI Wenjie, CHEN Yiping, HU De’an. Effect of Different Molten Pool on Microstructure and Properties of Aluminum-Copper Laser Weld Joint. Materials Reports, 2021, 35(20): 20052-20056.
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2021, Vol. 35 
