Abstract
The present work involves friction stir spot welding 6061 aluminium alloy of 2 mm thickness sheets using different tool rotation speeds 700, 900 and 1100 RPM which are carried out in two different mediums which are air and water. It was observed that with an increase in tool rotation speed from 700 RPM to 1100 RPM, the load bearing capacity increased and also a slight increase in hardness was observed irrespective of the welding medium. On the other hand, friction stir spot welding in water was found to be beneficial as compared to that in air, as an increment of 100 N in load bearing capacity and also a slight increment in hardness was observed. The improvements in the observed mechanical properties of the FSSW samples in water are attributed due to the microstructural refinement in the weld nugget zone.
Published Version
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