surfacing steel tooth cone bit face, the casting wc particle size is 20~30 mesh, 30-40 mesh and 40-60 mesh. There are two welding methods: A.The welding method, firstly, the cast wC particles are directly adhered to the tooth surface by water glass, and then heated by an oxygen-acetylene flame to melt the base metal, and the cast WC particles are deposited on the tooth surface. B.Surfacing method, in order to improve the metal flowability and surface smoothness during surfacing, prevent the generation of pores. Before stacking, add 2 tablespoons of syrup, 20g of manganese powder and silicon powder per 10 kg of cast WC, and mix evenly. The cast wc particles are either tubed or unmounted as needed. The reworked cast WC can significantly improve the weld overlay performance, effectively eliminate the pores, enhance the fluidity, and improve the quality of the weld overlay. Alternatively, the borax may be melted and crushed at about 600 ° C, blended with the cast WC, and then placed in a steel pipe, and the amount of borax added to each pipe is not more than 0.5 g. By doing so, the pores can be effectively eliminated and oxidation can be prevented.