Engine valve working conditions are harsh, usually in high temperature and pressure, high scouring and high abrasive environment, and there is a great impact wear between the valve disc head and valve seat, the quality of the valve directly affects the service life of the engine, fuel consumption, torque, etc., so the raw materials required to make engine valves have high performance: high-temperature strength, good corrosion resistance and good high-temperature impact toughness, Good abrasion resistance. Although use new designs and materials can improve the comprehensive performance of the valve, but the valve disc head cone, valve stem and valve end face have different mechanical performance requirements, a single material is difficult to meet the full range , What kind of process technology can meet this requirement in the future? Would it be an optimal process to design individual surface reinforcement in the critical areas of the valve?

Laser cladding technology is an advanced surface modification technology, is a high-energy laser beam as a heat source, the surface of the material irradiation scanning the cladding material and the substrate material melting together, the formation of the cladding layer and the cladding material on the surface of the substrate, due to the high cooling rate, the coating organization will occur grain refinement, thus enhancing the wear resistance, oxidation resistance, corrosion resistance of the substrate material and so on.

In the valve sealing surface using laser cladding technology to melt the appropriate materials can effectively repair the valve, extend the service life of the valve, improve the utilization rate of the material; in the engine valve spray welding layer on the laser cladding, can improve the corrosion resistance and wear resistance of the valve, to extend the service life; in the valve seat on the laser cladding, but also can improve engine performance, reduce the temperature of the valve and the seat ring, the engine durability also has a significant increase; in addition, with the plasma cladding, it is also a good way to improve engine performance, reduce the temperature of the valve and seat ring. finally, compared with plasma spray welding and other processing processes, laser cladding coating not only has better wear resistance and corrosion resistance, but also higher processing efficiency and material utilization.

Although laser cladding technology has certain advantages over the current traditional technology, but it is still developing, looking forward to the future it will promote the development of the whole engine valve industry.