Regulation of intermetallic compound layer in friction stir lap welding of aluminum/steel: a short review

In this paper, the research on control of intermetallic compound during aluminum/steel friction stir lap welding is reviewed. Sev‐ eral means that improve the properties and quality of the joints are presented by controlling the IMCs layer. The thickness of IMCs layer is controlled by the processing parameters, tool structure and aided processing, and the types of the IMCs are controlled by the processing parameters and the addition of the interlayer design. Advantages and disadvantages of the above methods are discussed. A new research di‐ rection with a large-lift angle structure of the tool is also proposed for the development of the aluminum/steel welding technology in this paper.