Pulsed DE-GMA welding brazing between magnesium and galvanized steel

Bead welding was made with AZ92A magnesium alloy wire on galvanized steel plate by pulsed DE-GMAW. By adjusting the welding parameters,homogeneous fusion width and good morphology of welded seam were obtained under the optimized welding parameters. The microstructure in the interface center of the joint was observed and analyzed by SEM,EDS and EPMA. And Mg₁₇Al₁₂,Mg_0.97Zn_0.03 and Fe₄Zn₉ intermetallic compounds were detected on stripped surfaces using XRD. The results show that under appropriate parameters,welding-brazing of magnesium/galvanized steel dissimilar metals were achieved by pulsed DE-GMAW. And Mg and Fe elements reacted with Zn to form intermetallic compounds during welding-brazing of magnesium alloy to galvanized steel.