Flexible ultrasonic-enhanced friction stir welding (FLEX-USE-FSW) is an advanced joining technique that integrates ultrasonic vibrations into the conventional friction stir welding (FSW) process. This study aims to evaluate the effects of ultrasonic assistance on the welding of AA6082-T6 aluminum alloy by conducting a comparative analysis with conventional FSW. The investigation will focus on mechanical properties, microstructural evolution, electron backscatter diffraction (EBSD) analysis, as well as the influence of process forces and temperature distribution. A key aspect of this research is the adaptation of an existing ultrasonic oscillation system, originally developed for drilling applications, for use in FSW. The study will systematically compare the influence of ultrasonic assistance on material plasticization, defect formation, and overall weld quality. Special attention will be given to the potential reduction of process forces, improvements in material flow, and changes in microstructural characteristics within the stirring zone. To assess these effects, welded joints produced by both FSW and FLEX-USE-FSW will undergo mechanical testing, including tensile and hardness measurements. The microstructure of the welds will be analyzed to determine the grain refinement and texture evolution induced by ultrasonic energy. EBSD analysis will be performed to investigate grain orientation and recrystallization behavior. Additionally, process force measurements will be recorded to evaluate the impact of ultrasonic assistance on axial and traverse forces. Temperature measurements will be conducted using embedded thermocouples positioned in the backing plate to monitor thermal variations during welding and provide insights into the heat distribution influenced by ultrasonic vibrations. The results of this comparative study will contribute to a deeper understanding of the potential benefits and limitations of ultrasonic-enhanced FSW, with a focus on improving weld quality, increasing process efficiency, and expanding industrial applications.