Strengthen mechanism of static mechanical properties of ultrasonic clinched joints
Clinching is a new technology for thin-plate material connection.It can realize the efficient con-nection of the same,dissimilar and multi-layer thin-plate materials without pre-hole and surface pretreatment.However,due to the low mechanical performance of clinched joints,the promotion and development of this connection technology are greatly limited.In order to solve this problem,this paper selects 5A06 aluminum alloy and TA1 titanium alloy for the same metal clinching.On this basis,the ultrasonic metal welding composite experiment was carried out.Based on static tensile test and scanning electron microscope analysis,the strengthening mechanism of ultrasonic welding on the mechanical properties of clinched joints was explored.The test results show that ultrasonic welding can effectively improve the mechanical properties of clinched joints,especially for aluminum alloy riveted joints.Ultrasonic welding improved the plasticity of the aluminum alloy joints,while the titanium alloy joints were hardened.After ultrasonic welding,the stress form of the clinched joint changes,from the stress on the neck to the stress on the welding area first and then on the neck,which is the fundamental reason for the composite strengthening of ultrasonic welding Ultrasonic welding can form a certain depth of solid-phase welding inside the aluminum alloy clinched joint,which greatly improves the mechanical properties of the aluminum alloy joint;while the internal solid-phase welding of the TA1 titanium alloy clinched joint is shallow,and the mechanical properties improvement is relatively low.
Ultrasonic metal weldingClinchingMechanical propertiesMicrostructureStrengthen mecha-nism
万方数据
维普
