对某汽轮机滑油泵转子的斜齿轮轴齿面的激光熔覆过程进行了研究，利用有限元软件ANSYS对其温度场进行了数值分析。结果表明，在齿面激光熔覆过程中，激光能量输入产生的热量大量集中在轮齿内部，且在熔覆层与齿根结合部位等温线分布比较密集，导致在轮齿内部出现较大的温度梯度，且激光输入产生的热量可对相邻轮齿产生预热的效果；计算结果还表明，越靠近齿顶，等温线越深入基体，若将轮齿的侧面和顶部同时熔覆，极易造成齿顶的过度熔化而塌陷。根据计算结果，提出了齿侧与齿顶分步熔覆的工艺，通过实际熔覆实验，在轮齿表面获得了连续、完整的熔覆层。

The laser cladding process on tooth surface of a helical gear shaft which is the rotor in lubricant pump of steam turbine is investigated. Temperature field is numerically simulated with finite element analysis software-ANSYS. Calculation results show that the heat caused by laser energy is concentrated inside the tooth mostly, and the distribution of isothermal lines is very dense at the binding site of clad coating and tooth root. Large temperature gradient would be generated inside the tooth. In addition, an effect of preheating in the adjacent tooth would also be brought up by laser energy. It is also indicated that the isothermal lines are penetrated into the tooth tip, and the problems of excessive melted down and collapsing of tooth tip would be easily brought about if the tooth side and tooth tip are cladded at the same time. So the tooth side and tooth tip should be cladded step by step. Continuous and complete clad coating on tooth surface is produced in experiment by this technology.