Interface Microstructure of Al-Fe Tubes Joint by Magnetic Pulse Welding

Magnetic Pulse Welding(MPW)is a very high speed process which produces solid-state welds.In this work,Welding interface microstructure of Al/Fe tubes by MPW and its influence factors were investigated.The equipment with a capacitor of 100μF was used under different voltages range from 8 kV to 15 kV.SEM and TEM observation were carried out to investigate microstructure of the welding interface.The results show that the dissimilar tubes(Al/Fe)could be welded with the optimum tapered angle of about 4 degree.The welding interface in Al/Fe joints exhibits a characteristic wavy morphology with wavelength of about 100μm.A new layer exists between base tubes consisting of Al and Fe elements.Ultrafme grained microstructure is founded near the welding interface.The results obtain in this work provide the fundamentals for the investigation of MPW mechanism of dissimilar tubes.