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Friction stir spot welding of Al6062/St1020 metals with dissimilar thicknesses

Friction stir spot welding is a permanent joining process where in a hard tool with peculiar geometry revolves within a stationary position upon the work material which are placed in lap structure. The tool is forced tangentially to the work material to which it penetrates in the work to produce the joint firmly. The heat generated when the tool penetrates is sufficient to create a medium such that the work material sticks together without melting the pin on the tool and without sticking to tool. Joining metals like steel is a challenge with the help of Friction stir spot welding (FSSW) procedure because of the hardness and high melting point of the steel. An effort is made to join the structural steel 1020 and AL6062 with different thickness. The tool used for joining of this dissimilar metal is tool steel H13. Tool steels can be used for lapped joints to weld both similar and dissimilar welds because it possesses high deformation and abrasion resistance. The joint performed with the help of optimization technique for process parameters.