Effect of Rotational Speed on the Microstructure and Texture of Thermomechanically Affected Zone of Al6082-T6 Friction Plug Welding Joint

Abstract Experiments were performed on Al6082-T6 using friction plug welding to investigate and resolve keyhole faults. The process required using friction as supplemental heating which was from between the shoulder and base metal. Friction plug welded connections were successfully created at rotational speeds of 1600 rpm, 1800 rpm, and 2000 rpm. The weld joints have no apparent structural flaws, and the joints demonstrate distinct partition features. During them, the thermomechanically affected zone of joints displays a distinct boundary between the base metal and plug, accompanied by a pronounced, preferred orientation. It can be deduced that augmenting the plug's rotational speed, the size of grain and the composition of high-angle grain boundaries will facilitate dynamic recrystallization and lead to a more pronounced recrystallization texture composition, assuming all other parameters remain constant.