The High Strength Aluminum Alloy Ultrasonic Agitation Hybrid Welding Process And Mechanism Studies

The heat that the Friction Stir Welding need is mainly from the fierce friction between the work-piece and the shoulder,the heat mechanism caused the upper temperature of the weld area is too high,and the deeper temperature inadequate,resulting the weld thickness direction of the organization very different,the depths is loosen,the welding thickness and strength is limited.This paper first summarize the status of the friction stir welding,the research of improving the flow of plastic materials,as well as the ultrasonic metal mechanism studies,on the basis of our discussion group for the Ultrasonic stir compound welding technology,improve the design,optimization welding process,through further study,it shows that the new welding method is positive.This Papers study includes three main parts:Ultrasound on the mechanism of plastic fluid,to improve the design of the Ultrasonic stir compound welding system,and a great deal of research for the welding experiments,a great deal of research results show that:the design of the mixing system can overcome high-speed rotating welding and welding load of the obstacles to successfully import energy into the bottom of the FSW weld,compare with FSW,the mechanical properties significant improve,the strength of the test for the welding aluminum 2219,2519, 7A52,and LF21,increased by 16.79%,3.31%,20.87%,10.13%respectively; The results of the study show that the ultrasonic welding process mechanism is to improve the metal activity and reduce flow resistance and metal welding temperature,thereby improve the weld performance, effectively generate refined grains,homogenized micro-structure and reduce the heat affected zone.