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本文建立了二维准稳态激光熔覆熔池流场及温度场的数值模型，除考虑对流换热外，模型还考虑了局部大变形自由表面．在贴体正交曲线坐标系下采用了非交错网格SIMPLE算法离散求解动量方程，计算出了激光熔覆熔池自由表面形状和温度场、速度场及局部特征凝团参.数值结果表明，表面张力温度系数和扫描速度μ0对熔池自由表面形状及熔池内温度分布、速度分布有重要影响．同时进行激光熔覆的工艺实验，实测枝晶二次臂间距（SDAD）的实验结果和数值结果吻合良好．
In this paper, a numerical model of two-dimensional quasi-steady laser cladded molten pool flow field and temperature field is established. In addition to the convective heat transfer, the model also considers the local large deformation free surface. In the orthogonal body coordinate system, the non-staggered grid SIMPLE algorithm was used to solve the momentum equation discretely, and the free surface shape, temperature field, velocity field and local characteristic coagulation parameters of laser cladding were calculated. Numerical results show that, The temperature coefficient of surface tension and scanning speed μ0 have an important influence on the free surface shape of the weld pool and the temperature distribution and velocity distribution in the weld pool. At the same time, laser cladding experiments were carried out. The experimental results of measured secondary dendrite arm spacing (SDAD) agree well with the numerical results.