A process called as Friction Stir Welding (FSW) in which welding of materials takes place by plastic deformation in
solid state and is highly applicable in joining of aluminium and copper alloys. The heat which is generated because of
revolutions of the tool and work material in this process due to friction leads to joining of the said alloys cause of plastic
deformation in solid state. An excessive usage of 7xxx is found in the field of transportation, marine and aviation sector. Fusion
welding on the other hand causes welds defects like porosity and hot cracking when applied to aluminium alloys. Friction stir
welding parameters like downward forces, tool material, traverse speed, rotational speed etc. has been studied and there effects
on weld strength are determined
