2219铝合金搅拌摩擦焊接热过程及拉伸性能分析  

Study on Thermal Process and Tensile Property of Friction Stir Welding of 2219 Aluminum Alloy

作　　者：赵艳秋 陈丹 韩国良 董曼红 占小红[1] ZHAO Yanqiu;CHEN Dan;HAN Guoliang;DONG Manhong;ZHAN Xiaohong(College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;Tianjin Long March Launch Vehicle Manufacturing Co.,Ltd.,Tianjin 300462,China;Beijing Institute of Astronautical Systems Engineering,China Academy of Launch Vehicle Technology,Beijing 100076,China)

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京211106 [2]天津航天长征火箭制造有限公司,天津300462 [3]中国运载火箭技术研究院北京宇航系统工程研究所,北京100076

出　　处：《热加工工艺》2023年第7期27-31,36,共6页Hot Working Technology

摘　　要：对厚度为8 mm的2219铝合金板开展单道搅拌摩擦焊接(SPFSW)试验,对厚度为15 mm的2219铝合金板开展双道搅拌摩擦焊接(DPFSW),分析不同厚度2219铝合金板搅拌摩擦焊接热过程与接头拉伸性能,重点探究第二道焊接对接头微观组织与拉伸性能的影响。结果表明:第二道搅拌摩擦焊接过程的高温区域与最高温度均大于第一道的,前进侧的最高温度均略低于后退侧的;15 mm厚DPFSW接头的抗拉强度略低于8 mm厚SPFSW接头的。接头拉伸断裂机制均为韧窝聚集型断裂与解理断裂相结合的模式。The single-pass friction stir welding(SPFSW)of 2219 aluminum alloy plates with thickness of 8 mm was carried out,while the dual-pass(DP)FSW was performed for 2219 aluminum alloy plates with thickness of 15 mm.The FSW thermal process and tensile property of 2219 aluminum alloy with different thickness were comparatively investigated.The influence of second pass welding on the microstructure and tensile property was emphatically studied.It is found that the high-temperature zone and the maximum temperature during the DPFSW process are both bigger than those of the SPFSW process.The maximum temperature of the advancing side is slightly lower than that of the retreating side.Besides,the tensile strength of the DPFSW joint with thickness of 15 mm is slightly lower than that of the SPFSW joint with thickness of 8 mm.The tensile fracture mechanism of the joints is the mode combining the dimple aggregation fracture with cleavage fracture.

关 键 词：2219铝合金 搅拌摩擦焊接 热过程 微观组织 拉伸性能 

分 类 号：TG453.9[金属学及工艺—焊接]