Abstract: Friction stir welding (FSW) involves temperature, mechanics, metallurgy, and their interactions, which has become a revolutionary green welding technique over the past two decades because of the low peak temperature, severe plastic deformation, and high⁃quality joint. In order to further broaden its application in manufacturing fields, it was necessary to break through the technical barriers of inherent issues. Based on the inherent issues of weld thinning, keyhole and defects quasi⁃equal strength repairing, back⁃supporting and high⁃quality welding of dissimilar materials (such as dissimilar metals and metals/polymers), this paper reviewed the development of FSW innovative technology, which had practical significance for improving joint forming, realizing high⁃reliability joining and expanding engineering application.

Key words: Friction stir welding, Inherent issues, Dissimilar materials, High?quality welding

摘要： 搅拌摩擦焊（Friction Stir Welding，FSW）涉及温度、力学、冶金及其相互作用，具有温度低、塑性变形剧烈、接头质量高等特点，为近二十多年来具有重大技术突破的绿色焊接技术。为了进一步拓宽其在制造领域的应用，需突破FSW固有模式的技术壁垒，同时探索异种材料高可靠及高质量连接方法。基于焊缝减薄、匙孔和缺陷近等强修复、背部支撑以及异种材料（异种金属及金属与聚合物等）高质量焊接等基本问题，总结了FSW创新性技术。FSW创新性技术对改善其接头成形、实现高可靠连接及拓展工程适用性具有重要的指导意义。

关键词: 搅拌摩擦焊, 固有模式, 异种材料, 高质量焊接