Rotary friction welding of dissimilar joints between SSM356 and SSM6061 aluminium alloys produced by GISS

Abstract

The objective of research to investigate the parameters, microstructure and mechanical properties of butt joint SSM356 with SSM6061 aluminum alloy by using RFW processes. The main parameters such as rotation speeds are 1550, 1700 and 1850 rpm, burn-off length are 2, 2.5 and 3 mm respectively. For experiment found that, both materials have weld ability to get along well though it has a different chemical composition, the changes in welded metals microstructures occurs deformation leads to smaller particle size. The average dimensions of Mg2Si particles were measured at 0.998 µm long and 1.021 µm wide when one of the workpiece was rotated at 1850 rpm with 2.5 mm burn-off length. The maximum average tensile strength is 87.24 MPa, efficiency of the weld joints is 51.89 percent compared with the base metal of SSM356 aluminum alloys, (base metal is 168.12 MPa) and efficiency of the weld joints is 68.45 percent compared with the base metal of SSM6061 aluminum alloys (base metal is 127.44 MPa). Furthermore, small particles distributed in the weld metal promotes increasing hardness property up to 65.56 HV in the weld metal as compared with those of the base metals.