This book introduces the principles and characteristics of friction stir welding and processing. Based on the inherent issues of friction stir welding, such as back support, weld thinning, and keyhole defects, the book summarizes innovative technologies related to solution strategies and presents a wide range of examples. It introduces the advantages and joining mechanism of friction stir welding in the joining of dissimilar materials and explains the importance of combining metallurgical bonding and mechanical joining. It also includes the characteristics of friction stir processing in terms of microstructure refinement, mechanical properties, surface modification, and the preparation of composites. This book is of interest to a broad readership in various fields of materials science and engineering.

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Prof. Dr. Yongxian Huang is the dean of the Department of Welding Technology and Engineering and the vice director of the State Key Laboratory of Advanced Welding and Joining. He received his Ph.D. degree from Harbin Institute of Technology in 2008. His research focuses on the basis and applications of friction stir welding, processing, additive manufacturing, and derived technologies. He has published 160 scientific papers and 100 granted patents. He has won provincial/ministerial level science/technology/teaching awards for 4 times.

Dr. Yuming Xie is an assistant professor of Harbin Institute of Technology. He received his Ph.D. degree from Harbin Institute of Technology in 2022. His research focuses on the deformation-driven metallurgy principles and numerical modelling of friction stir welding. He has published 50 scientific papers and 20 granted patents.

Dr. Xiangchen Meng is an associate professor of Harbin Institute of Technology. He received his Ph.D. degree from Harbin Institute of Technology in 2020. His research focuses on the solid-state welding, additive manufacturing, and remanufacturing of lightweight and dissimilar materials. He has published 100 scientific papers and 20 granted patents.