Research progress of laser cladding technology

       Laser cladding technology is a new surface modification technology that emerged with the development of high-power lasers in the 1970s. Rapid heating and melting, self-excited cooling after the beam is removed to form a surface coating with a very low dilution rate and metallurgical bonding with the base material, thereby significantly improving the wear resistance, corrosion resistance, heat resistance, oxidation resistance and electrical properties of the base surface. A surface strengthening method [. For example, after carbon tungsten laser cladding is performed on 60# steel, the hardness is up to 2200HV or more, and the wear resistance is about 20 times that of the base 60# steel. After laser cladding CoCrSiB alloy on the surface of Q235 steel, its wear resistance was compared with that of flame spraying, and it was found that the corrosion resistance of the former was significantly higher than that of the latter.

Laser cladding technology is a new technology with high economic benefits. It can prepare high-performance alloy surfaces on cheap metal substrates without affecting the properties of the substrate, reducing costs and saving precious and rare metal materials. Therefore, the world's All advanced industrial countries attach great importance to the research and application of laser cladding technology.