Ultrasonic spot welding (USW) is a promising joining method for magnesium to steel to overcome the difficulties of fusion welding for these two materials with significant differences in melting temperatures. In a previous paper, the results of ultrasonic spot welding of magnesium to steel, with sonotrode engaged Mg piece, was presented. In this study, same material combination (0.8-mm-thick galvanized mild steel and 1.6-mm Mg AZ31B-H24) was used, but with sonotrode engaging steel piece. Various welding time, from 0.4 to 2.0 sec, were applied. Tensile lap-shear test, optical metallography, and scanning electron micrography were conducted for joint strength measurement and microstructural evaluation. The joint strength reached over 4.2 kN at 1.8 sec welding time. Mg-Zn eutectic was formed at the interface, indicating the interfacial temperature over 344°C. The study demonstrated USW to be a viable process for potential manufacturing of mixed-metal joints. The process is shown to be insensitive to metal arrangement of either the AZ31 or steel engaged with the sonotrode.
Ultrasonic Spot Welding of Galvanized Mild Steel to Magnesium AZ31B
Sae Technical Papers
SAE 2012 World Congress & Exhibition ; 2012
2012-04-16
Conference paper
English
Ultrasonic Spot Welding of Galvanized Mild Steel to Magnesium AZ31B
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