The goal of the current paper is to Aluminium (1100) to brass (c2700) alloyjoints were used in this work to explore the microstructure and mechanical aspects of dissimilar friction stir welding. The tool's(FSW) mechanical characteristics are tungsten. Additionally,micro hardness assessments and tensile tests to evaluate mechanical qualities were established. The spinning speed,welding speed, and traverse speed of the tungs ten tool were the three keyfactors in this study.The joint's maximum tensile strength was not done for the aluminium to brass base material at the time it was fastened.Results demonstrate that the factors will greatly influence the material flow and microstructure qualities at the interface between(FSW) a joint in a defect-free joint. The tensile strength of the weld is reduced with increasing rotationspeed and traverse speed increases, which is followed by the disappearance ofthe intermetallic layer at the interface, high weld defect values, and rotationthickeningthislayer.