2A12铝合金“三动环”回填式搅拌摩擦点焊接头组织与性能研究  

Study on Microstructure and Properties of 2A12 Aluminum Alloy Joints Welded by ReFSSW with Three Rotating Rings

作　　者：贺地求 左震[1,2] 马力 王海军 谢新辉 HE Diqiu;ZUO Zhen;MA Li;WANG Haijun;XIE Xinhui(Light Alloy Research Institute,Central South University,Changsha 410083,China;State Key Laboratory of High Performance Complex Manufacturing,Central South University,Changsha 410083;Nanchang Advanced Technical School of Nuclear Industry,Nanchang 330220,China)

机构地区：[1]中南大学轻合金研究院,湖南长沙410083 [2]中南大学高性能复杂制造国家重点实验室,湖南长沙410083 [3]核工业南昌高级技工学校,江西南昌330200

出　　处：《热加工工艺》2021年第13期44-48,共5页Hot Working Technology

摘　　要：设计并制造了一种新型"三动环"回填式搅拌摩擦点焊装置,其由轴肩、套筒和搅拌针组成,焊接时轴肩和套筒、搅拌针同向同频率旋转。轴肩的作用是防止焊接过程中材料的外溢,并提供更多的热量输入。采用此装置对2A12铝合金进行点焊搭接试验,并利用金相显微镜、扫描电镜、能谱仪及拉伸试验对接头的微观组织和力学性能进行了研究。结果表明,相较常规回填式点焊,"三动环"装置所焊试样有效结合面积更大,且在焊核区没有发现聚集的纯铝粘结韧带,最佳参数下试样的平均失效载荷为10.08 kN。A new type of ReFSSW(refilled friction stir spot welding) device with three rotating rings was designed and manufactured. The device consists of shoulder, sleeve and pin. And the shoulder, sleeve and pin rotate in the same direction and frequency during the welding. The function of the shoulder is to prevent material overflowing during the welding and provide more heat input. Overlapping spot welding of 2 A12 aluminum alloy was carried out by this device and the microstructure and mechanical properties of the joint were studied by metallographic microscope, scanning electron microscopy, energy dispersive spectrometer and tensile test. The results show that, the effective bonding area of the specimens welded by ReFSSW with three rotating rings is larger compared with that by conventional ReFSSW, and no aggregated pure aluminum bonding ligament is found in the nugget zone. The average failure load of the specimens under the optimum parameters is 10.08 kN.

关 键 词：搅拌摩擦点焊 三动环 微观组织 2A12铝合金 

分 类 号：TG441.8[金属学及工艺—焊接]