Laser Quenching equipment
Perform phase transformation hardening treatment on the metal surface to improve the hardness, wear ...
Perform phase transformation hardening treatment on the metal surface to improve the hardness, wear ...
Used for surface strengthening, repair, and remanufacturing of components, the coating has high adhe...
Flexible processing of complex curved sheet metal parts, with high cutting accuracy, fast speed, and...
Specially designed for seamless welding of precision plastic components, with a small heat affected ...
Valves used in nuclear power plants operate in extreme environments of high temperature, high pressure, and strong radiation, with extremely stringent requirements for sealing integrity. The traditional Stellite welding process, due to high heat input, may cause coarsening of the matrix grains and promote irradiation swelling. At the same time, the cobalt element in the welding material will generate radioactive Co-60 under irradiation, increasing the maintenance dose.
Laser cladding technology provides a better choice for the manufacturing of nuclear valve sealing surfaces. Firstly, its low heat input significantly reduces the heat affected zone and avoids grain growth. Secondly, by optimizing the composition, low cobalt or cobalt free nickel based or iron-based high-performance alloys (such as Norem or high entropy alloys) can be used to reduce the production of radioactive nuclides from the source. Research has shown that these new laser cladding layers exhibit more stable microstructures and hardness under simulated irradiation conditions, and have significantly better resistance to radiation embrittlement than traditional cladding layers.
Therefore, laser cladding is not only a technical path to improve the sealing surface performance of nuclear valves, but also an important measure to meet the increasingly strict environmental and radiation safety requirements of nuclear power plants.
