The Friction Stir Processing (FSP) is based on the Friction Stir Welding process. The FSP technique presents several characteristics, which can provide localized modification and control of microstructures in near-surface layers of processed metallic components, in order to modify the corresponding mechanical behaviour. In this research MIG T-fillet and butt welds, performed in 6082-T651 aluminium alloy plates with 6 mm thickness, were post-processed by the FSP technique. The FSP effect was analysed performing tensile and fatigue tests, as well as microstructural analysis and hardness measurements. Fatigue tests were carried out under constant amplitude loading at a stress ratio R=0, with the load applied perpendicular to the weld bead. The hardness and mechanical strength of the welds were not significantly modified by the Friction Stir Processing. However, an important fatigue life improvement was obtained due to the stress concentration reduction by geometry modification, elimination of MIG weld defects, and also by achieving a refined microstructure in the post-processed weld toe.
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