Abstract
Magnesium alloys are the lightest of all structural metals and are in great demand in various automotive and aerospace industry. The current research work focusses on evaluating the effects of input process parameters on the metallurgical properties of friction stir welded magnesium alloys. The variable input parameters chosen are tool rpm, travel speed and the plunge depth. Microstructural studies revealed three distinct zones in the welded specimen, viz: stir zone also known as the weld nugget, thermo mechanical affected zone and the unaffected base material. Large sized grains were observed at the top surface of the welded specimens due to more heat input at the top. The microhardness of the workpiece was measured in the traverse direction and maximum hardness observed in the stir zone is about 16% higher than the parent material.
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