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应用激光熔覆的传热模型、热传导模型和激光熔焊的对流传质模型,对激光熔覆机理进了分析讨论,随后分析了激光熔覆速度极限和熔覆工艺参数对熔层组织结构的影响。使用5kW横流CO_2激光器对核电站使用的截止阀零件密封面进行了激光熔覆处理,经检测:激光熔层可达3.0mm厚,其表面光滑平整,无裂纹、气孔等缺陷。与传统的等离子喷焊、电弧堆焊工艺进行测试比较,其结果说明:激光熔层中的组织晶粒度和硬度更高,稀释率更低,抗摩擦磨损和抗腐蚀性性能更好。激光熔覆新技术能明显改善核阀的质量,可以延长核阀的服役期、提高生产系统的安全性和可靠性。
The heat transfer model of laser cladding, heat conduction model and convection mass transfer model of laser welding are analyzed and discussed. The laser cladding speed limit and the influence of cladding process parameters on the microstructure of the melt layer influences. A 5kW cross-flow CO_2 laser was used to laser seal the sealing surface of the globe valve parts. The laser melt layer can reach 3.0mm thick and the surface is smooth and smooth with no defects such as cracks and pores. Compared with the traditional plasma spray welding and arc welding process, the results show that the structure of the laser melt layer has higher grain size and hardness, lower dilution rate, better anti-friction and corrosion resistance properties. New laser cladding technology can significantly improve the quality of nuclear valves, nuclear valves can extend the service period, improve production system security and reliability.