Research On Parameter Optimization And Joining Mechanism Of Magnetic Pulse Welding For 1060 Aluminum-TA1 Titanium Tube

With the progress of technology and development of industry,dissimilar metal joining is usually required to ensure multiple characteristics of one component.Specifically,aluminum-titanium dissimilar metal joining has found wide applications worldwide.However,the great difference between aluminum alloy and titanium alloy in terms of their material performance makes it hard to achieve favorable joining.Therefore,the non-contact solid-phase welding technique–electromagnetic pulse welding–is chosen to carry out the welding experiment on the aluminum-titanium dissimilar metal.In this research,the magnetic pulse welding technique is used to conduct the welding experiment on 1060 aluminum tube and TA1 titanium bars.To start with,the peeling test and the shearing test are combined to study different discharge voltages and radial gaps on the joining effect of the welded joint.At the same time,a series of welding experiments is conducted to summarize the aluminum-titanium magnetic impulse welding process window.Following that,the influence of the overlap length on the welded joint is studied through the mechanical property experiment and the welded joint microscopic representation.Moreover,the changing rules of the impact model at different overlap lengths are discussed.At last,the electron scanning microscope,energy disperse spectroscopy and hardness tester are used for microscopic representation of different welded joints and to analyze the causes behind the formation of different welded joints and the constituents of the transition layer.Results suggest that,when the discharge voltage increases alone,the joining strength of the welded joint strengthens.When the radial gap increases alone,the joining strength of the welded joint first decreases and then increases.Compared with the discharge voltage,the influence of the radial gap on the joint joining enhances.Through the process window,it can be observed that the discharge voltage and the radial gap influences each other in the practical welding process.When the discharge voltage exceeds certain value,the larger the radial gap is,the smaller the joining strength is.As the overlap length decreases,the scope of the invalid joining area in the joint is reduced or eliminated.Combining the mechanical property and microtopography,the impact model of the aluminum-titanium magnetic pulse welding is divided into three models,including the bidirectional impact model,overall impact model and unidirectional impact model.The morphology of different jointing interfaces can influence the joining strength.The transition layer is formed after the fusion of the jointing interface whose elements are diffused.In this way,the large amounts of kinetic energy carried by the outer tube provides the heat for the jointing interface fusion.Then,the energy spectrum is combined to speculate the existence of the compound Al₃Ti and some aluminum parent material not fully fused in the transition layer.