Abstract
AA7075 alloy and AZ31 alloy are light weight structural materials which have high specific strength, but weldability of these alloys are poor which restrict their applications. In the present work, joining performance of dissimilar AA7075 alloy and AZ31 alloy in butt configuration have been evaluated by Friction Stir Welding at different operating parameters. H13 tool steel, HSS and tungsten carbide have been used for tool materials to weld 6.35 mm thick plates. A successful joint was obtained by using tungsten carbide tool at rotational speed of 900 rpm, traveling speed of 30 mm/min and tool tilt angle of 3°. Optical image of welded sample shows tunnel, voids and insufficient penetration in pin influenced zone of the weld. Tensile strength and microhardness of the welded sample were 41.97 MPa and 177.4Hv, respectively. Also, intermetallic compounds Al12Mg17 and Al3Mg2 were observed in XRD analysis of stir zone.
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