Automotive Innovation ›› 2020, Vol. 3 ›› Issue (3): 221-230.doi: 10.1007/s42154-020-00106-0
Study on the Weld-Bonding Process Optimization and Mechanical Performance of Aluminum Alloy Joints
Mingfeng Li1,2 · Yanjun Wang1 · Zhen Niu3 · Shanglu Yang1,4
- 1 Shanghai Institute of Optics and Fine Mechanics , Chinese Academy of Sciences , Shanghai 201800 , China
2 University of Chinese Academy of Sciences , Beijing 100049 , China
3 Beijing Benz Automotive Co., Ltd , Beijing 100049 , China
4 Center of Materials Science and Optoelectronics Engineering , University of Chinese Academy of Sciences , Beijing 100049 , China
Study on the Weld-Bonding Process Optimization and Mechanical Performance of Aluminum Alloy Joints
Mingfeng Li1,2 · Yanjun Wang1 · Zhen Niu3 · Shanglu Yang1,4
- 1 Shanghai Institute of Optics and Fine Mechanics , Chinese Academy of Sciences , Shanghai 201800 , China
2 University of Chinese Academy of Sciences , Beijing 100049 , China
3 Beijing Benz Automotive Co., Ltd , Beijing 100049 , China
4 Center of Materials Science and Optoelectronics Engineering , University of Chinese Academy of Sciences , Beijing 100049 , China
摘要：
The 5754 aluminum alloy has been widely used in the automotive industry to reduce the weight of vehicles. The weld-bonding (WB) process comprising resistance spot welding and adhesive bonding processes effectively improves the mechanical properties of joints. However, it is still a great challenge in the WB process to obtain high-quality and defect-free nuggets of aluminum alloys. In this study, the parameters of the WB process are optimized and the mechanism of generation of defects during WB is analyzed. The results show that the welding parameters have a significant effect on the nugget sizes, among which the welding current plays the most important role. The residual adhesive can easily cause defects during welding, e.g., expulsion and porosity in the nugget. This can be effectively avoided by optimizing the welding parameters. In addition, the gas in the joints is effectively reduced by adding an appropriate preheating pulse prior to welding, thus lowering the damage degree of the adhesive layer. As a result, welded joints with better weld nugget quality and more stable mechanical properties are obtained.