Effect of backing material and clamping system on the tensile strength of dissimilar AA7075-AA2024 friction stir welds

Effect of pin offset on the mechanical properties of friction stir welded AA 6013 aluminum alloy plates

“…Deformation and heat, generated by stirring activity of pin during friction stir welding, is effective on the microstructural evolution of stir zone [37]. Those effects, namely deformation and heat, cause the dynamic recrystallization to occur in the stir zone, making the microstructure to change in this region [16]. The intense plastic deformation and sufficient heat input cause the dynamic recrystallization process to occur in a large area [38].…”

“…A low amount of heat input originated from lower values of tool rotational speed may cause inadequate plastic deformation to occur, resulting in defective stir zone and accordingly causing the mechanical properties to get worsen [41]. The characteristic response of the friction stir welding process is extruded, forged and rotated grains in the stir zone [16,[44][45][46]. As the pin moved along the weld line, the plastically deformed metals in stir zone is transferred to the gap left behind [16,47].…”

“…The characteristic response of the friction stir welding process is extruded, forged and rotated grains in the stir zone [16,[44][45][46]. As the pin moved along the weld line, the plastically deformed metals in stir zone is transferred to the gap left behind [16,47]. Occurrence of intense plastic deformation and heat during welding process caused grain size and boundary of stir zone and thermomechanically affected zone to change.…”

“…During friction stir welding, the metal on the adjacent surface of the plates is softened by the rotation of the pin and shoulder. The pin is rotated against the joint line for a while, that comes with the increase in welding temperature being high enough to plasticize the metals [16]. The softened metals are transferred to the gap, located behind the pin, and due to the movement of the pin through the joint line, a strong bond between the two plates is produced [16].…”

“…The pin is rotated against the joint line for a while, that comes with the increase in welding temperature being high enough to plasticize the metals [16]. The softened metals are transferred to the gap, located behind the pin, and due to the movement of the pin through the joint line, a strong bond between the two plates is produced [16]. The stepped tool, consisted of a shoulder and specially designed pin, exhibits a major role in producing welded joints with improved mechanical properties.…”