MECHANICAL PROPERTIES AND PROCESS FORCES DURING FRICTION STIR WELDING OF AA2219 AT VARIABLE WELDING SPEED AND TOOL ROTATION

Abstract

Welding speed and tool rotation (rpm) were varied systematically during friction stir welding of
aluminium alloy 2219-T87. The effect of these parameter on process forces and mechanical properties of the weld joints
was studied. It was observed that increasing welding speed resulted in higher process forces due to decrease in heat
input whereas inverse relation between tool rotations and process forces was recorded. Weld nugget was observed to
consist of fine equiaxed grains probably due to continuous dynamic recrystallization due to heat and shear deformation
as a result of stirring of material