Abstract
In the current investigation the effect of tool pin profiles (threaded cylindrical and straight cylindrical) on the mechanical properties (ultimate tensile strength, percentage elongation and joint efficiency) of friction stir welded and friction stir processed aluminium alloy (AA1100) was investigated. Taguchi L-18 array was used to select the transverse and rotational speed of the tool. The three distinct variables (tool shape, speed and feed rate) were used during investigation. From the results it was found that the joint fabricated by threaded tool profile gives maximum tensile strength and percentage elongation than the straight cylindrical tool pin profile. It is also found that, the threaded tool pin have good joint efficiency as compared to cylindrical tool i.e. maximum of 90% at 1800 rpm and feed rate of 50 mm/min. The joint constructed by threaded tool have maximum percentage elongation (8.38%) at 2400 rpm and feed rate of 45 mm/min. In addition, the joints fabricated by threaded tool pin profile have exhibited more ductility than cylindrical tool profile.
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