The Effect of Bobbin Friction Stir used different tool Design on the Mechanical Properties to Weld 6061-T6 Aluminum Alloy
Bobbin tool design is critical in the advancement of friction stir welding (FSW) process. Two pieces of AA6061 Aluminum alloy with thickness of 8 mm were joined by friction stir welding bobbin tool using conventional milling machine; this study investigated the effect of different pin profiles on the process of FSW. Four pin tools with different shapes (threaded pin, cylindrical pin, square pin and threaded pin with two flat faces), were investigated at 300 rpm spindle speed and 100 mm/min welding speed, this tools made from hot work steel (H13) AISI with special heat treatment to produce 48 HRC hardness, the tensile properties of welding parts, the defects, and the surface appearance that produced by different pin shapes were presented and discussed. The results showed that the pin profiles effected on the welding profile and the defects. The threaded pin with two flat faces design influences the material flow pattern and weld quality and surfaces appearance is best compare with other tools pin profile.