What is spray welding and what are its significant advantages compared with

       

What is spray welding and what are its significant advantages compared with

Spray welding is to heat the preheated self-dissolving alloy powder coating to 1000～1300℃ to melt the particles, and the slagging floats to the surface of the coating. The generated borides and silicides are dispersed in the coating to make the particles Achieve good bonding with the surface of the substrate.

 

 

 

The final deposit is a dense metal crystalline structure and forms a metallurgical bonding layer of about 0.05 to 0.1 mm with the matrix. Its bonding strength is about 400 MPa, with good impact resistance, wear resistance and corrosion resistance, and its appearance is mirror-like.

 

 

 

Compared with spray coating, spray welding coating has significant advantages. However, due to the partial heating of the substrate during the remelting process, the temperature will reach 900°C, which will cause large thermal deformation of the parts.

 

 

 

Therefore, the scope of application of spray welding has certain limitations. The parts and materials suitable for spray welding are generally:

 

 

 

① Subject to impact load, high surface hardness and good wear resistance are required for vulnerable parts, such as sand blaster blades, crusher tooth plates, excavator bucket teeth, etc.;

 

 

 

②Large and easy-to-wear parts with simple geometric shapes, such as shafts, plungers, sliders, hydraulic cylinders, chute plates, etc.;

 

 

 

③ Low-carbon steel, medium-carbon steel (carbon content less than 0.4%), structural steel containing manganese, molybdenum, and vanadium less than 3%, nickel-chromium stainless steel, cast iron and other materials.