At present, the construction and development of various industries in the global energy field are becoming increasingly diversified, and the downstream industries that are changing simultaneously are also constantly adjusting their layout to adapt to this demand. For example, in recent years, the development trend of the oil industry has been rapidly shifting to inland oil fields and offshore oil fields, and the development trend of the electric power industry has been from thermal power below 300,000 kilowatts to thermal power, hydropower and nuclear power above 300,000 kilowatts… In addition to this In addition, the concept of energy conservation and environmental protection is like a “curse” firmly placed on the heads of manufacturers, prompting the production of breathing valves, steam traps, high-pressure valves, pressure-reducing valves, quick opening and closing valves, flame arresters, filters, and pipe sight glasses. The processing or manufacturing technology of other products must be changed to meet the needs of use. The applications of valves go far beyond these, such as a large number of low-pressure pump valves widely used in urban construction systems, flat gate valves, and ball valves widely used in oil and gas pipeline construction, etc. Therefore, the demand for valves will be very large.
Most of the operating conditions of valves include high wear, concentrated corrosion sources, and the need to withstand higher pressures and temperatures. Therefore, how to improve the wear resistance, corrosion resistance, and high-temperature strength of valves under high-temperature and high-pressure conditions has become a technical problem that many companies are competing to solve. Among them, laser cladding technology has received the most attention. Laser cladding is a new type of surface modification technology, also called laser repair and laser remanufacturing. It uses different fillers to place selected coating materials on the surface of the coated substrate and then irradiates them with a laser. A thin layer on the surface of the substrate melts simultaneously and solidifies rapidly to form a surface coating with extremely low dilution and metallurgical bonding with the substrate material. Different coating materials can obtain different surface properties.
Advantages of laser cladding:
- The laser cladding layer and the workpiece surface form a strong metallurgical bonding interface;
- The laser energy control is concentrated, and the heat input causes minimal deformation of the workpiece;
- Greatly improve the wear resistance, corrosion resistance, and oxidation resistance of the part’s surface;
- Recycling and remanufacturing prolongs the service life of equipment and saves usage costs.
