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A5J32-T4 and A5052-H32 dissimilar aluminum alloy plates with thickness of 1.6 and 1.5 mm werewelded by friction stir lap welding (FSLW). The FSLW were studied using different probe length tool and variouswelding conditions which is rotation speed of 1000, 1500 rpm and welding speed of 100 to 600 mm/min and materialarrangement, respectively. The effects of plunge depth of tool and welding conditions on tensile properties and weldnugget formation. The results showed that three type nugget shapes such as hooking, void, sound have been observedwith revolutionary pitch. This plunge depth and material arrangement were found to effect on the void and hooking for-mation, which in turn significantly influenced the mechanical properties. The maximum joint efficiency of the FSLWedplates was about 90% compared to base metal, A5052-H32 when the A5052-H32 was positioned upper plate and plungedepth was positioned at near interface between upper and lower plates. Keywords : Friction stir lap welding, Dissimilar aluminum alloy, A5052, A5J32, Tensile shear test

Effects of Welding Conditions and Material Arrangement on Tensile Properties of Friction Stir Lap Welded of Dissimilar Al Alloy, A5J32/A5052