Study on parameters that affect the Friction Stir Welding of 6063 aluminum alloy and 7075 aluminum alloy

Abstract

The friction stir welding [FSW] was invented by The Welding Institute of England. For welding material were difficult to fusion welding such as aluminum. Currently, there is research and application for many aluminum alloys but there is no research a friction stir welding with aluminum alloy 6063 and 7075 cause interest to do research. The tool in the experiments was designed to be M 6 right screw cylinder stirrer. The tools rotated clockwise tools were tilted tool at 0-3 degree. The rotation speeds of the tools were 1000-2000 rpm. The welding speeds were 50-160 mm/min. The welded examined. The joint defect, joint tensile strength, microstructure and the hardness of welded area were investigated. The summarized results are as follows. The variation of welding parameter such as the rotating speed, the welding speed affected to completion of the welding surface. The onion ring structure that was observed in the similar aluminum joint could not be observed in this AA 6063 and AA 7075 sound joint. The optimum condition that indicated the tensile strength of 110 N/mm2 was tools tilt angle of 3º, rotating speed of 1000 rpm and welding speed of 100 mm/min. The highest hardness of the weld of 185 HV could be found when the joint was produced by rotation of 1600 rpm welding speed of 100 mm/min and tools tilt angle of 1.5º.