The aluminum alloy plate Al–6063 was butt-welded employing friction stir welding in the current investigation. Using Taguchi L9 orthogonal design of experiments, the process parameters of tool rotational speed, tool traverse speed, and shoulder diameter were optimized. The optimal process parameters were calculated based on the weld's ultimate tensile strength(UTS). A validation run utilizing the optimum settings confirmed the projected ideal value of UTS. The maximum important elements contributing to weld strength, according to the analysis of variance, were tool rotation speed (RS) tool traverse speed(TS) and axial forces(AF). utilizing the full factorial analysis, the maximum critical parameters were discovered. RS, SD , and their interacting impact were revealed to be the maximum critical parameters using full factorial analysis. According to the Anderson-Darling test, UTS follows a normal distribution.