超声功率对2219-T351铝合金搅拌摩擦焊接头组织与性能的影响  

Effect of ultrasonic power on microstructure and properties of 2219-T351 aluminum alloy friction stir welding joint

作　　者：贺地求 胡雷[2] 赵志峰 赖瑞林[2] HE Diqiu;HU Lei;ZHAO Zhifeng;LAI Ruilin(Light Alloy Research Institute,Central South University,Changsha,410083,China;State Key Laboratory of High Performance Complex Manufacturing,Changsha,410083,China)

机构地区：[1]中南大学,轻合金研究院,长沙410083 [2]中南大学,高性能复杂制造国家重点实验室,长沙410083

出　　处：《焊接学报》2020年第3期23-28,I0002,共7页Transactions of The China Welding Institution

基　　金：国家973项目资助(2014CB046605)。

摘　　要：采用搅拌摩擦焊和不同功率的超声辅助搅拌摩擦焊对2219-T351铝合金进行焊接试验,测量焊接温度和焊接压力,对焊接接头的微观组织、显微硬度和力学性能进行分析,研究了加入不同超声功率后焊缝的组织性能和材料流动性.结果表明,超声能降低焊接温度,随着超声功率增加减小的幅度越大.加入了超声后,焊缝微观组织更加均匀,底部材料的流动情况得到改善,焊缝区有更多的强化相残留,焊接接头的显微硬度、抗拉强度及断后伸长率在加入超声后均有提高,在加入2.25 kW的超声功率时达到最高,最高拉伸强度为331 MPa,可达到母材的80%左右.Aluminum alloy 2219-T351plates were welded by friction stir welding and ultrasonic assisted friction stir welding with different power.The welding temperature and welding pressure were investigated.Microstructure,microhardness and mechanical properties of welds under different ultrasonic powers were analyzed.The microstructure and material fluidity of the weld with different ultrasonic power were researched.Experimental results showed that Ultrasonic energy can reduce the welding temperature and welding force.With the action of ultrasound,the microstructure of the weld is more uniform,and the fluidity of the bottom material is improved.There is more residual reinforcement phase in the weld zone.The microhardness,tensile strength and elongation of the welded joints are all improved under ultrasonic.All the magnitudes reached the highest when adding 2.25 kW ultrasonic power.The highest tensile trength is 331 MPa,which can reach about 80%of the base metal.

关 键 词：搅拌摩擦焊 超声 焊接温度 微观组织 力学性能 

分 类 号：TG453.9[金属学及工艺—焊接]