Abstract
AZ31 magnesium alloy plates 6 mm and 8 mm in thickness were butt welded using an AC TIG welding machine. Effects of welding conditions on mechanical properties of welded joints were examined. In case of the double square groove butt welded joint using 6 mm thickness plate, the good bead was obtained with surface current of 120A/over and penetration current of 120A /less. And the highest tensile strength of welded joint showed with surface current of 140A and penetration current of 120A, this value is 92% of the base metal. The.double-V groove butt welded joints of plate thickness of 8 mm with filler wire, it is obtained enough penetration with both surface and penetration current of over 150A. The maximum joint efficiency of welded joint with both surface and penetration current of 150A showed 95% of the base metal.
