Effect of V content on microstructures and properties of TiC cermet fusion welding interface

The effects of vanadium (V) on the microstructures and mechanical properties of the TiC cermet fusion welding interface were studied by adjusting the content of V in the self-developed flux-cored wires using metal inert gas arc (MIG) welding for surfacing on the TiC cermet. The results show that the increase in V content promotes the element diffusion between TiC cermet and weld metal. There are no defects observed in the interface, and the diffusion of elements refers to excellent metallurgical bonding. The shear strength of the fusion zone initially decreases and then increases with the increase in V content. The maximum shear strength of the TiC cermet/weld interface, reaching 552 MPa, occurred when the V content reached 0.65%. Meanwhile, the average hardness in the transition zone reached 488.2 HV0.2.