利用ANSYS软件建立了光组件有限元简化模型，以高斯热源为热源模型，采用非线性瞬态分析完全法对焊缝的温度场分布进行数值模拟，获得在不同激光输出功率和激光光斑半径下焊斑大小和深度的变化规律。结果表明，周期较短的脉冲波形能够有效改善焊接质量；焊斑熔深和宽度随激光输出功率的增大而增大，随激光光斑半径的增大而减小；数值仿真效果与焊缝实际焊接效果基本吻合，验证了光组件有限元模型的适用性，为在不同激光焊接工艺条件下预测和提高光组件焊接质量提供了有效的实验依据。

With the simplified finite element model of optical components established by the software ANSYS, Gaussian heat as heat source model, and the nonlinear transient analysis, the weld temperature field distribution is numerically simulated. The variation laws of welding spot size and depth with laser beam radii and output powers are obtained accurately. The results show that the short-period pulse waveform can effectively improve the welding quality. The depth and width of welding spot increase with the increase of laser output power and decrease with the increase of laser beam radius. And the numerical simulation result is basically consistent with the actual situation, which verifies the applicability of the finite element model of optical components. The study provideds an effective experimental basis for the prediction and improvement of welding quality of optical components in different laser welding processes.