THE EFFECT OF TOOL GEOMENTRY AND PROCESS PARAMETERS ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF FRICTION STIR WELDED DISSIMILAR JOINTS OF AA7075 ALUMINIUM ALLOY AND PURE COPPER

In this paper introduce Friction Stir Welding on dissimilar metals; the effect of different tool geometries and process parameters on mechanical properties of Copper/Aluminum plates was investigated. Aluminum alloy AA7075 and Pure Copper both with the thickness of 5mm plates were welded. Two types of tools were used with the material made of H13 tool steel of cone and cylindrical shapes. Rotational speeds of 450 rpm, 560 rpm, 710 rpm and tilting angles of 2 0 and 2.50 with constant traverse speed of 16 mm/min were used for better understanding of the effect of the welding parameters on tensile strength. The tensile test results showed in the strength of the joints in comparison with the tilt angle and tool geometry at constant traverse speed. To change the tilting angles vary the strength of the joint because of material flow between joint and tool. The maximum strength obtained at rotational speed of 710 rpm, tilting angle 20 and traverse speed of 16 mm/min and also discuss microstructures of Cu/Al joints.