Abstract
ABSTRACTHigh-power ultrasonic welding technology, which has the excellent characteristics of low-energy input and high efficiency, can effectively shorten the welding time, reduce the formation of intermetallic compounds (IMCs), and improve the strength of Mg/Al dissimilar welded joints in the future manufacturing industry. Mg/Al dissimilar metal ultrasonic welded joints with favourable mechanical properties were obtained through reasonable selection of sonotrode patterns and optimisation of welding parameters. The connection mechanisms of joints were discussed based on the analysis of weld interface morphology, microstructure evolution, and the composition and distribution of Mg–Al IMCs that varied with welding energy. The mechanical interlocking phenomenon and discontinuously distributed Mg17Al12 with low thickness were observed at the weld interface, which helped to improve the joint performance.
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