(1. 哈尔滨工业大学 现代焊接生产技术国家重点实验室，
哈尔滨 150001；
2. 北京航空工艺研究所， 北京 100024)
摘 要: 采用搅拌摩擦焊接法焊接了镁合金AZ31， 研究了焊接参数对焊接接头微观组织和显微硬度的影响。结果表明： 焊接接头成形良好， 焊缝没有气孔、 裂纹和夹渣， 焊缝区的显微硬度比母材稍有降低， 但降低幅度不大。
关键字: 搅拌摩擦焊； 镁合金； 显微组织； 显微硬度
（1. State Key Lab of Advanced Welding Production Technology,
Harbin Institute of Technology, Harbin 150001, China;
2. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China）
Abstract:AZ31 magnesium alloy was welded by friction stir welding(FSW), and the changes of microstructure and micro-hardness caused by different welding parameters were also studied. The results indicate that good joints without porosity, crack and dregs are obtained and micro hardness in nugget zone is a little lower than the parent metal.
Key words: friction stir welding; magnesium alloy; microstructure; micro-hardness
