Welding studies on dissimilar magnesium alloys for improving corrosion behaviour

Dissimilar friction stir and tungsten inert gas between Magnesium alloys AZ31B and ZM21 plates with a thickness of 5 mm was performed. The friction stir welding tool is rotated at 2100 rpm under a constant transverse speed of 140 mm/min. A salt fog corrosion test is used to determine weldments' material losses and corrosion behavior in various zones using different welding processes for magnesium alloys like AZ31B and ZM21, which use friction stir welding (FSW) tungsten inert gas (TIG) welding. AZ31B weldment area is more susceptible to corrosion than ZM21. Both welds' macro and microstructures are analyzed to understand the metallurgical characteristics of the two different welds. Taguchi L9 orthogonal design improves process parameters for both the FSW and TIG welding processes. The rotating speed, tool shape, and axial load are the input process parameters for FSW, while the welding speed is kept constant. By single goal optimization, the maximum tensile strength of the dissimilar joints is 208 MPa. FSW welds of Dissimilar Magnesium alloys AZ31B and ZM21 were successfully manufactured with no defects.