Application of laser cladding in the power industry

With the development of economy and society, laser cladding is widely used in the power industry. Renewable resources have been granted new missions such as energy conservation and emission reduction, greenhouse gas emission control and air pollution prevention and control. Wind speed and water power, as pollution-free and pollution-free new energy sources for power generation, have made great contributions to the power industry.

In the power industry, due to the large amount of power equipment and the extremely high utilization rate, it needs to operate continuously for a long time, so the destruction rate of its parts is relatively high. Parts of generator equipment work in different working environments, such as honed in natural gas, high temperature, high pressure, and corrosive substances. If the equipment is used for a long time, the parts will become brittle and damaged. Like the centrifugal impeller, water turbine, shaft tenon, etc. in wind/hydro power plant equipment, in order to increase the service life of expensive production equipment, It is necessary to use surface remanufacturing technology to repair it, especially the blades used for generator sets are usually very expensive. Reinstalling and reusing the repaired blades will greatly reduce the power generation cost of the power plant.

Laser cladding technology is an important method of surface modification technology for raw materials. The high-energy density laser is used to quickly melt alloys with different compositions and properties and the surface of the substrate, and produce different compositions and properties on the surface of the substrate. The entire process of rapid condensation of the alloy layer. Under the rapid heating effect, the substrate has little damage when exposed to heat and has no deformation. The molten layer alloy is a self-contained system with compact structure, optimized grains, improved strength and strong ductility, and greatly improved surface properties. Laser cladding technology solves a series of bottlenecks such as thermal deformation and thermal fatigue damage that are inevitable in the entire heat treatment process such as traditional electric welding and argon arc welding

Laser cladding has low dilution rate, compact structure, good fusion of coating and substrate, and reliable application. According to the application of laser cladding at this stage, its key uses are in three levels: one is the surface modification of raw materials, such as steam turbine blades, rollers, etc.; the other is repairing parts, such as wind power main shafts, planet carriers, planetary wheels, etc.; It is rapid prototype manufacturing, that is, the use of metal powder sintering and accumulating step by step to quickly create a model. The use of lasers can also repair damaged three-dimensional complex parts, which fully reflects the flexibility and advanced nature of laser remanufacturing technology.