Friction stir welding, a solid state joining technique, is widely being used for joining Al alloys for
aerospace, marine automotive and many other applications of commercial importance. FSW
trials were carried out using a drilling machine on Al 6063 alloy. The tool rotational speeds 485,
710, 910, 1120 and 1400 rpm with a traverse speed 4 mm/min were applied. The Mechanical
properties of welded joints were investigated using different mechanical tests including destructive
test (tensile test, hardness and microstructure). Based on the stir welding experiments conducted
in this The resultant microstructure was characterized using optical microscopy This paper
presents the optimization of friction stir welding for pipe and also highlights the influence of
microstructure and mechanical properties of FSW 6063 Al alloy.