Abstract
Cast aluminum–magnesium–scandium (Al–Mg–Sc) alloy is used in this study to carryout the possibilities of various welding techniques. In this study, Bead-on-plate welds were made on cast Al–Mg–Sc alloy using both tungsten inert gas (TIG) and friction stir (FS) welding processes. Microstructural characterization revealed that FS-weld microstructure consisted of fine and fragmented recrystallized grains compared to TIG welding. Mechanical properties of FS-welded joints were better than TIG-welded joints. Evaporation of magnesium was more in TIG welding than FS welding. It is concluded that FS welding process resulted in significantly stronger joints and is more suitable to join cast Al–Mg–Sc alloy.
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