Effects of Friction Welding Dissimilar Joint to Metallurgy and Mechanical Properties between Aluminum Casting Semi-Solid Metal 356 and 7075 with Copper Interlayer on Welded
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Abstract
This research studied friction stir welding of dissimilar joints of aluminum semi-solid metal between SSM 356 and SSM 7075 with 10 mm diameters and 100 mm length under the rotation speed of 1,300 rpm, 50 bar friction pressure, 3-level compression pressure including 10, 20 and 30 bar, a friction time of 30 seconds, and the compression time of 5, 7 and 10 seconds. This study examined welding factors affecting macrostructure, microstructure, and mechanical properties. The findings revealed that the rotational speed, compression pressure and compression time directly affected the occurrence of weld flashes in relation to tensile strength. It was found that the maximum tensile strength was 203.81 MPa at the 1,300 rpm rotation speed, 20 bar compression pressure and a 7-second compression time; the maximum hardness at 1,300 rpm rotation speed, 10 bar pressure at and a 7-second compression time equals 97.8 HV. Factors selected for friction welding added with the copper material interlayer on welded joints comprise 1,300 rpm rotation speed, 20 bar compression pressure, a 7-second compression time, with the welded joint tensile strength of 170.70 MPa and 127.63 HV hardness.
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