Effect of Cobalt Plating on Performance of Al/Steel Magnetic Pulse Welded Joints
Cobalt metal film was plated on the surface of Q235 steel plate to be welded,and then the welding of 1060 aluminum plate/Q235 steel plate was carried out by using magnetic pulse welding(MPW)technology.Through the scanning electron microscopy(SEM)observation,energy spectrum analysis(EDS),microhardness testing and tensile properties analysis,the interface morphology,microstructure and mechanical properties of the welded joint were studied,and it was compared with the Al/non coated steel welded joint.The results show that the aluminum/non coated steel EMP weld is composed of the middle unwelded zone and the connection zone on both sides,and the interface has straight weld,small waveform and big waveform.The transition zone width of the waveform interface is about 6 μm,and the brittle intermetallic compound FeAl3 exists in the transition zone,and the tensile-shear strength is 122.22 MPa.The Co-plated steel/aluminum welding interface is well formed,and obvious big waveform interface is formed,and the width of the transition zone is about 8 μm.The Co element of the plating layer effectively hinders the diffusion of the Fe element into the transition zone,and it avoids the generation of aluminum-iron intermetallic compounds,increases the waveform interface,effectively improves the mechanical properties of the joint.The tensile-shear strength is 137.78 MPa,which increases by 12.7%.
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