Fatigue behaviour and life estimation of Mg/Al ultrasonic spot weld bonding welds |
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| Authors: | Meng-Nan Feng Yao Chen Dong-Hui Fu Chuan Qu |
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| Affiliation: | 1. School of Materials Science and Engineering, Tianjin University, Tianjin, People’s Republic of China;2. School of Mechanical Engineering, Tianjin University, Tianjin, People’s Republic of China |
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| Abstract: | Mg/Al dissimilar joints with favourable static and dynamic mechanical properties were obtained utilising ultrasonic spot welding and ultrasonic spot weld bonding technology. The fatigue behaviour, fatigue failure mode, and typical fatigue fracture surface morphology of Mg/Al ultrasonic spot welding and ultrasonic spot weld bonding joints were compared and observed to get a better understanding of the fatigue failure mechanism. In general, the Mg/Al ultrasonic spot weld bonding joint exhibited better fatigue performance than the ultrasonic spot welding joint. The two kinds of joints presented different fatigue failure modes with decreasing applied load level. A fatigue life prediction model was established, and the fatigue life prediction results were in good agreement with the experimental fatigue results. |
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| Keywords: | Mg/Al dissimilar joint ultrasonic spot weld bonding fatigue behaviour fatigue life estimation fatigue fracture mode |
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