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The purpose of this research was studied friction stir welding of dissimilar butt joint materials between aluminum cast semi-solid 2024 and aluminum semi-solid 6061 with the sample dimensions of thickness of 4 mm, width 50 mm and length 100 mm. The analysis of the microstructure and mechanical properties under parameter the rotation speeds of 710, 1,000 and 1,400 rpm and the welding speeds of 40, 80 and 112 mm/min. It was found that the best friction stir welding condition in all experimental was used the rotation speed of 1,000 rpm, welding speed 112 mm/min the value of tensile strength and maximum hardness in the stirred area (Stir Zone: SZ) are 190.4 MPa and 137 HV respectively. Addition to, metallurgical the welding is characterized by wide welds when using a high welding speed and has a smooth welding surface when using a high welding speed.
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