Research progress in friction stir welding of steel and aluminum

Only by obtaining a good comprehensive performance of steel/aluminum dissimilar metal joints can the steel/aluminum dissimilar metal joint structure be used more widely in the field of national defense and national production. However, cracks and intermetallic compounds are easy to occur during welding of steel/aluminum, which seriously affects the quality of welded joints. As a kind of low temperature and high efficiency solid phase bonding method, friction welding has been attached great importance in the field of new material connection and high performance equipment manufacturing. Among friction welding methods, the friction stir welding has been paid more and more attention because of various types of welded joints. In this paper, the research progress of friction stir welding of steel/aluminum is introduced from the form and process parameters, which provides the basis for further research.