Surfacing welding is a welding process in which a wear-resistant, corrosion-resistant, heat-resistant and other functional metal layer is deposited on the surface or edge of the workpiece. Surfacing welding has significant economic benefits for improving the service life of parts, using materials reasonably, improving product functions, and reducing costs. Different workpieces and surfacing wires need to use different surfacing processes to achieve satisfactory surfacing effects. The most common problem encountered in surfacing welding is cracking. The first method to prevent cracking is:
1. Preheat before welding, control the temperature between layers, and slowly cool after welding.
2. Perform stress relief heat treatment after welding.
3. To prevent multi-layer surfacing, use low-hydrogen surfacing electrode.
4. When necessary, surfacing transition layer between the surfacing layer and the base metal (use a welding wire with low carbon equivalent and high resistance)