The bucket tooth of excavator can be repaired by the following surfacing welding process after large area of wear.

(1) use the grinding wheel to grind 2 ~ 3mm off the surface of the base material and remove the original work hardening layer.When there are cracks in the base material, v-shaped groove should be opened to completely remove the cracks.

(2) use A202 electrode for base welding, and the electrode must be baked at 150℃ for 1h;Select D256 electrode surfacing surface, electrode must be baked at 300 ~ 350℃ for 1h.Electrode alternating current dual use.

(3) first fill the v-shaped groove with the A202 electrode and the short bead, and then carry out the subarea base welding. Divide the surfacing part according to the width of 60-80mm and the gap width is about 10-30mm, as shown in figure 4-37.

(4) when surfacing the surface layer with D256 electrode, surfacing the surface area as shown in figure 4-37 until the surfacing reaches the required thickness and then surfacing the gap.

(5) during the surfacing welding process, it is necessary to prevent the base metal from overheating. When necessary, part of the base metal can be submerged in water for surfacing welding.