DEVELOPING EMPIRICAL RELATIONSHIPS TO PREDICT THE STRENGTH OF FRICTION STIR SPOT WELDED AA6061-T6 ALUMINUM ALLOY AND COPPER ALLOY DISSIMILAR JOINTS
Keywords:
Friction stir spot welding, Copper alloy, Aluminum alloy, Dissimilar joint, Response surface methodology, Tensile shear fracture loadAbstract
Friction Stir Spot Welding (FSSW) is a variant of friction stir welding (FSW) process, in which the rotating tool is plunged into a material under high forging force to create a bond. It is employed to join dissimilar materials like aluminum and copper as it is a solid state welding processes, and helps to eliminate defects found in fusion welding processes. FSSW finds extensive application in the automobile and aerospace industries. In this investigation, an attempt is made to join aluminum alloy (AA6061) with copper alloy (commercial grade) by FSSW process. The effects of the four major parameters of FSSW process, namely Tool rotational speed (N), Plunge rate (R), Dwell time (T) and Tool diameter ratio (D) have been explored in this investigation. An empirical relationship has been developed by response surface methodology (RSM) to predict strength of the welded joints incorporating these parameters.
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