How are cemented carbide tool materials classified?The difference between surfacing and spray welding

       Surfacing is applied to the repair of thicker base materials, such as the repair of coal mills, cement mills, and rolls.



Spray welding is used in the repair or protection of devices with thin base materials or not suitable for surfacing, such as high-pressure boiler tube wall spraying, fan blade spraying, etc. Spray welding is to heat the preheated self-dissolving alloy powder coating to 1000-1300°C to melt the particles and float up to the coating surface. 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 a mirror-like appearance.





As an economical and fast process method for surface modification of materials, surfacing welding is more and more widely used in the manufacturing and repairing of parts in various industrial sectors. In order to play the role of the surfacing layer most effectively, it is hoped that the surfacing method used has a smaller dilution of the base material, a higher deposition speed and excellent surfacing layer performance, that is, high-quality, high-efficiency, and low-dilution surfacing. Technology.