Now the technology is very developed, reflected in the field of welding there are a lot of, in addition to the traditional welding methods, some new welding methods have gradually emerged, in various production areas play an important role. Surfacing welding is one of the advanced repair welding methods.

Surfacing welding is a welding process in which the surface or edge of the workpiece is deposited with a layer of metal layer with wear-resisting, corrosion-resisting and heat-resisting properties. Surfacing welding has significant economic benefits on improving the service life of parts, rational use of materials, improving product performance and reducing cost. In order to obtain satisfactory surfacing effect, different surfacing technology should be adopted for different workpiece and surfacing electrode. The most common problem encountered in surfacing welding is cracking, the main method to prevent cracking is: preheating before welding, control the temperature between layers, slow cooling after welding. Stress relief heat treatment is carried out after welding. Avoid multilayer surfacing and use low hydrogen type surfacing electrode. When necessary, surfacing the transition layer between the surfacing layer and the base metal (with low carbon equivalent, high toughness electrode).

At present in the field of industrial industry production, the technical requirements of surfacing welding and operating workers is very high, in practice is not only to avoid cracking, and after the welding of the surface of the workpiece hardness, strength and smoothness, and so on to meet the national requirements, which requires the enterprise to have good welding equipment, so as to maximize after the guarantee welding quality.