The Influence of Tool Geometry on the Mechanical Behaviour of FSSWed Al/Cu ARBed Composite

摘要

In the present study, the threaded cylindrical pin and the triangular pin were employed to friction stir spot welding of Al/Cu ARBed composite, and their influence on the material flow and mechanical properties of the spot welds were investigated. Under the same processing condition, higher temperature was measured during friction stir spot welding by using the cylindrical pin, as a result of higher frictional heat and greater material pressed by the pin face, leading to a greater area (volume) and effective length of the stir zone. This, in turn governed by the material flow, resulted in higher shear failure load of the spot welds produced by using cylindrical pin. Nevertheless, asymmetric geometry of the triangular pin appeared to cause higher microhardness around the triangular pin.