Influence of SiC Microparticles and Multi-Pass FSW on Weld Quality of the AA6082 and AA5083 Dissimilar Joints

Abstract

In the current research, the in uence of multi-pass (one, two and three passes) of friction stir welding and SiC microparticles on the tensile strength, microhardness and %strain of dissimilar reinforced joints of AA6082 and AA5083 was examined. Tool rotating speed of 900 rpm, transverse speed of 45 mm/min, tool tilt angle of 2º and 8% volume percentage of SiC microparticles were considered as constant parameters for multi-pass FSW. The nding demonstrated that increasing the number of FSW passes from one to three augmented the dispersion pattern of Sic microparticles. The grain re nement of multipass reinforced joints was achieved by the pinning effect of SiC microparticles and dynamic recrystallization. The three-passes FSWed reinforced joint exhibited the highest tensile strength (247.17 MPa), %stain (13.1%) and microhardness (126.6 HV) due to the higher grain re nement.