The high-chromium wear-resistant flux-cored wire with the self-made tungsten carbide is used as the welding material. By using gas metal arc welding

surfacing experiments under different welding conditions are carried out to analyze the microstructure and wear resistance of the surfacing layer and study the effect of welding procedure on the microstructure and properties of tungsten carbide reinforced high chromium wear-resistant steel. The results show that as the heat input increases

the bead penetration and width increase

the heat affected zone of the surfacing layer enlarges

while the weld reinforcement reduces. The matrix structure of the tungsten carbide reinforced high chromium wear-resistant steel surfacing layer is composed of austenite and eutectic carbide. The eutectic carbide is fishbone-shaped or rod-shaped and mainly composed of iron-chromium-tungsten phase. The spherical tungsten carbide is melted and decomposed in the matrix

and its microstructure is mainly composed of the original tungsten carbide particles

tungsten iron chromium diffusion layer and fishbone-shaped eutectic carbide. As the heat input increases

the proportion of austenite content in the matrix structure increases

the original tungsten carbide particles gradually get smaller until they are completely melted

and the hardness and wear resistance of surfacing layer reduce.