Development of in situ MMC joint using friction stir spot welding of Al6061-T6

Abstract

In this study, friction stir spot welded joints of Al6061-T6 were obtained using Silicon Carbide particles as reinforcement. The effect of reinforced particles along with process parameters was analyzed in terms of tensile-shear strength, weld structure, hook formation. The investigations revealed that tensile-shear strength increased by 29.78 % with incorporation of silicon carbides particles in the weld region. The guiding hole diameter was found to be signi cant parameter for improved weld strength. Combination of moderate tool rotation speed, higher pre-dwelling time and guiding hole diameter were recognized as effective combination of process parameters. Weld cross sections were studied under stereo zoom microscope and optical microscope to observe different bonding regions. The scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) con rmed the presence of silicon carbides particles in weld region.