Al alloy(Al)/steel dissimilar metals structures have a critical application in the aerospace industry,especially in the delivery pipeline of high thrust liquid launch vehicles.Compared with welding methods such as fusion welding and brazing,rotary friction welding can achieve a reliable joint between Al and steel with high quality,high strength and high corrosion resistance.The research progress of rotary friction welding of Al/steel dissimilar metals was reviewed from the optimization of welding process parameters,analyses of interface microstructures,control of interface inhomogeneity and metallurgical control by adding inter-layer metals.Finally,the development trends and scientific problems to be solved in rotary friction welding of Al/steel dissimilar metals were summarized.
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