Abstract
Aluminium alloys AA5XXX and AA6XXX have low density and high yield strength and are frequently used to make air, sea and land vehicles/technology lighter. Different types of aluminium alloys need to be adaptively assembled together. Therefore, it is important but difficult weld aluminium alloys. This study investigated the microstructural and mechanical properties of two dissimilar aluminium alloys, AA5754 and AA6013, which were welded using gas metal arc welding (GMAW) and friction stir welding (FSW). Hardness, tensile, bending, and fatigue tests were done on the welded samples. The test results were evaluated and interpreted according to the literature. The weld zone (weld metal, HAZ) of AA5754 and AA6013 aluminium alloys joined by GMAW and FSW showed significant differences. The highest tensile strength and fatigue life were obtained from the FSWed sample after the base metals. The welded samples joined using both welding methods were successfully deformed by 180° without any damage to their upper or lower surfaces.

Key words
FSW, GMAW, AA5754, AA6013, microstructure, fatigue strength

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