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Friction stir welding of Aluminum alloys has been increasingly
used in the industry on the ground of higher welding quality in comparison with
conventional methods. However, not enough studies have been done on a lap joint
of AA 6061-T6 which widely been used in aerospace industries. In this article,
friction stir lap welding of 6061-T6 aluminium alloy with 5 mm thickness was
carried out by using various welding speeds. The effect of welding speed on
microstructure, lap shear performance, micro hardness, failure mode and effective
plate thickness was investigated. Results showed that tensile shear strength
of weld increased by the rising welding speed. Rising welding speed caused hooking
and thinning approaches to two plate interfaces which in turn concluding in
higher tensile shear strength. The fracture surface of welds was analyzed by
field emission scanning electron microscopy (FE-SEM). Study of the fracture
surface of the nugget zone by EDX indicated the Fe compounds in that region.
