Research on Fatigue Life of Al/Mg Dissimilar Metals Electromagnetic Pulse Welding Joints Based on Weibull Distribution

doi:10.3901/JME.260171

Abstract

Abstract: The lap joints of 1.0 mm thick 5052 aluminum alloy tube and 1.5 mm thick AZ31 magnesium alloy tube were successfully obtained by electromagnetic pulse welding technology. The strength of Al/Mg joints is higher than that of Al alloy base metal by optimizing the process parameters. The fatigue life and fatigue failure characteristics of Al/Mg joints are studied by fatigue performance testing and fracture characterization. The results show that the weld length of Al/Mg joints increased first and then decreased with the increase of discharge energy, and the mechanical properties of Al/Mg joints are the best when the discharge energy is 35 kJ. The Al/Mg joints are more sensitive to fatigue loading, and the fatigue life of Al/Mg joints gradually decreased with the increase of stress. The fatigue failure location of the joints at low stress levels is the impact zone of Mg tube, while the fatigue failure location of the joints at high stress levels is the weld seam. The fatigue life of the joints is statistically analyzed based on dual parameter Weibull distribution, and S-N curves are plotted under different confidence levels (10%, 36.8%, 50% and 90%), which provides certain theoretical basis and teat reference for the application of Al/Mg electromagnetic pulse welding joints in automotive and other industrial fields.

Key words: electromagnetic pulse welding, Al/Mg dissimilar metals, Weibull distribution, fatigue life, fatigue failure behavior

CLC Number:

TG156

ZHU Congcong, CUI Junjia, LI Guangyao, GAO Wenli. Research on Fatigue Life of Al/Mg Dissimilar Metals Electromagnetic Pulse Welding Joints Based on Weibull Distribution[J]. Journal of Mechanical Engineering, 2026, 62(10): 201-209.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.260171

http://www.cjmenet.com.cn/EN/Y2026/V62/I10/201

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