Mechanical and Microstructure Investigations on Magnetic Pulse Welded Dissimilar AA3003-TC4 Joints

In this paper, 3003Al and TC4 sheets were welded by magnetic pulse welding. The mechanical properties and microstructure of Al/Ti joints were investigated. The results showed that the mechanical properties of welding joints could be enhanced by the increasing effective welded area and transition layer average thickness. Three bonding types were observed in the weld interfaces: solid-state bonding, solid–liquid coexistence state bonding and liquid-state bonding. Three distinct types of defects: cracks along the welding direction, cracks across the diffusion layer, micron-sized pores and shrinkage cracks, occurred in the Al/Ti interfaces with different bonding types. The XRD results showed that TiAl3 and Ti3Al were generated in the weld interface. The cleavage fracture, parabolic dimples and orthogonal dimples existed in the failure surface of different locations.