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| Investigation on the Effect of Discharge Voltage on Metal Jet and Bonded Interface in Mg-Al Magnetic Pulse Welding |
| Zhou Yan1, Li Chengxiang1, Du Jian1,2, Wang Xianmin1, Yao Chenguo1 |
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China;
2. State Grid Chongqing Electric Power Company Yongchuan Power Supply Branch Chongqing 402160 China |
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Abstract In recent years, magnetic pulse welding (MPW) technology has shown a broad application prospect because of its unique advantages in welding dissimilar metals. The discharge voltage is an important electrical parameter in the EMPW process, and the metal jet can clean the surface of the metal and the oxide layer that promotes the metallurgical bonded of metals. To explore the effect of discharge voltage on the metal jet and the bonded interface, the relationship among the discharge voltage, the characteristics of the metal jet and the morphology of the bonded interface was studied, an integrated observation platform for the MPW process of the Mg and Al sheets was established, and the trajectory of the metal jet was captured. The results showed that when the discharge voltage was increased from 13kV to 16kV, the collision speed increased from 403.12m/s to 498.49m/s, but there was no significant effect on the collision angle; the duration of the metal jet increased from 31.02μs to 47.94μs, and the intensity of the metal jet also gradually increased. The metallographic microscope test results showed that when the discharge voltage was 14kV, 15kV, and 16kV, the Mg-Al bonded interface presented the wave interfaces, the amplitude increased continuously, and the bonded zone width was 1.27mm, 1.35mm, and 1.77mm, respectively. The discharge voltage changes the welding effect through the collision speed, the collision point speed, the collision pressure, and the remaining energy after the collision. This paper can provide a powerful reference for further study on the mechanism of EMPW and improvement of welding effect.
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Received: 29 July 2020
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2022, Vol. 37 
