Citation: | ZHANG Yuxuan, ZHANG Mingjun, LI Heqing, ZHANG Jian, CHENG Bo, MAO Cong, CHENG Shuangyin. Experiment welding of Al/Cu dissimilar metals with infrared-blue hybrid laser welding for power battery[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2025, 46(1): 87-94. DOI: 10.12073/j.hjxb.20231027001 |
Aiming at the technical difficulties of laser overlap welding of Al/Cu dissimilar metals, a new infrared-blue hybrid laser welding process was proposed. Laser welding of the overlap joints of 5052 aluminum alloy and T2 copper with thickness of 1 mm was carried out. The effects of different blue laser powers on the weld appearance, microstructure and mechanical properties of the joints were investigated. The results showed that the convection diffusion of copper elements from the lower copper plate to the upper aluminum plate could be weakened by using infrared-blue laser hybrid welding process with a blue laser power in the range of 0 ~ 500 W. With the increase of blue laser power, the mixing degree of molten copper and aluminum was increased, resulting in more brittle Al-Cu intermetallic compound (IMC) phases. Generates the following phases in the order from the copper side to the aluminum side, ϒ2-Al4Cu9, AlCu, θ-Al2Cu, α-Al + Al2Cu eutectic structure and Al/Cu eutectic structure. Among these, Al2Cu was the primary IMC phase at the interface layer of the joints. When the infrared laser power was
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