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Spray-welding is to preheat the autolytic alloy powder coating to 1000 ~ 1300℃, so that the particles melt, slag floating on the surface of the coating, the generated boride and silicide dispersed in the coating, so that the particles and the substrate surface to achieve a good combination.The final sediment is a dense metal crystalline structure and forms a metallurgical bonding layer of about 0.05 ~ 0.1mm with the matrix. The bonding strength is about 400MPa. It has good impact resistance, wear resistance and corrosion resistance, and has a mirror appearance.

Compared with the spray layer, the advantages of the spray welding layer is significant, suitable for spray welding parts and materials are generally:

(1) The impact load requires high surface hardness and good wear resistance of the vulnerable parts, such as the blade of the sander, the tooth plate of the crusher, the bucket tooth of the excavator, etc.;

(2) Geometric shape is relatively simple large vulnerable parts, such as shaft, plunger, slider, hydraulic cylinder, chute plate, etc.;

③ Total amount of low carbon steel, medium carbon steel (carbon content below 0.4%), manganese, molybdenum, vanadium <3% structural steel, nickel chromium stainless steel, cast iron and other materials

There are many varieties of self-melting alloy powders made in China. Nickel-based alloy powders have strong corrosion resistance, oxidation resistance up to 650°C and strong wear resistance.The most important characteristic of cobalt-based alloy powder is its good red hardness and good wear resistance and corrosion resistance at 700℃.The wear resistance of iron base alloy powders is better than that of the other two kinds