This paper is a review of research work in the last decade on friction stir welding. Research is going on to investigate the effect of various process parameters on quality of the welded joint. In this study, the investigation is made on the effect of various process parameters, such as tool rotational speed, traverse speed, axial force and tool geometry on the quality of the welded joint are reviewed. Yield strength, ultimate strength, elongation, toughness, microstructure of the joint are evaluated and correlated with received base material. To compare and validate experimental results, FEA model is the best way to study the quality of welded joint.