In a second case a non-age-hardening AA5754 sheet was FSW by an innovative approach in which welding pin was forced to slightly deviate away from the joining centreline (defined by authors as RT). In a first case, an age-hardening AA6082 sheets were double side friction stir welded (DS-FSW). In this respect, the present contribution focuses on two modified-FSW techniques and approaches applied to aluminum alloys plates. In the last few years with the need and emerging urgency to widen the FSW application fields, broadening the possible alloy systems, and to optimize the resulting mechanical properties, this joining technique was further developed. Several studies accounted for the microstructural modifications induced by solid-state FSW, based on the resulting mechanical properties obtained at the FSW joints, such as tensile, bending, torsion, ductility and fatigue responses. FSW has been found to be a reliable joining technique in high-demand technology fields, such as high-strength aerospace aluminum and titanium alloys, and for other metallic alloys that are hard to weld by conventional fusion welding. This new joining technique is considered an energy-saving, environment friendly, and relatively versatile technology. Friction stir welding (FSW) is the most widely used solid-state joining technique for light-weight plate and sheet products.
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