激光熔覆石化阀门密封面熔覆层裂纹控制的研究

Study on crack control of layer during laser cladding sealing surface of petrochemical valves

采用 5kW横流CWCO2 激光器 ,对不同基体材料的石化高参数阀门密封面进行激光熔覆 ,所用合金粉末为CoCrWB与NiCrFeBSi合金粉末。在研究解决了厚层单道熔覆裂纹问题基础上 ,得到了厚 2mm～ 3.5mm ,表面平整、无质量缺陷的激光熔覆层。结合激光熔覆阀门零件的试验研究 ,分析探讨了影响熔覆层 ,特别是厚层熔覆层裂纹形成的各种因素及其综合影响 ,提出了关于建立判断熔覆层裂纹形成的应力判据模型的思路。

This paper investigates laser cladding the sealing surface of high parameter petrochemical valves with 5kW transverse flow CW CO 2 laser.The base metal of valves is various,and the cladding powder is CoCrWB or NiCrFeBSi powder.A 2mm～3.5mm thick layer of laser cladding with smooth surface and non flaw can be made,based on solution of crack problem of cladding layer by a single scanning and thick cladding.Various elements and their interaction which influence the formation of crack in laser cladding layer,especially of thick layer,and control of crack are discussed and analyzed according to the experiments.The thought of building a model of stress judgement to judge the formation of crack in cladding layer is put forward.