Effect of Friction Stir Processing on Microstructure and Mechanical Properties of TIG Welded Aluminum Alloy 2024-T3
This present work aims to demonstrate the effect of friction stir processing (FSP) on the microstructure and mechanical properties of TIG welded joints of aluminum alloy AA2024-T3 with using ER4047 filler metal. The welded specimens were exposed to tensile and hardness tests and microstructure assessment at the best FSP parameters (1000 rpm and 16 mm/min). Tensile strength for TIG +FSP joint was (317MPa) that showed higher value than that of TIG weld (225 MPa), hence showing 41% increase from TIG weld. Also the hardness values of TIG + FSP specimen comes out to be 137-141HV which were higher than the base metal (124HV), whereas in TIG specimen hardness values were 115-118HV. That means there is improvement in the hardness value. Optical microscopic analysis has been done on the weld joint to evaluate the effect of FSP parameters on welding quality and microstructure. Microstructure of TIG + FSP joint sample is very fine equiaxed grains in stir zone of FSP which is better than the microstructure of TIG joint which is column grains in weld zone.