为了研究活性剂对激光焊接试样熔池温度的影响，以304不锈钢厚板为对象，建立了活性激光焊接的ANSYS 3维有限元模型，数值模拟其焊接温度场，并采用红外热像仪同步监测熔池温度变化情况。综合数值计算与试验检测数据，对比分析了涂覆不同活性剂及未涂敷活性剂的试件在激光焊接过程中的温度变化趋势。结果表明,数值模拟结果与试验结果基本吻合，活性剂涂敷并未对温度场分布造成明显影响，但对熔池的峰值温度略有改变，相比未涂敷活性剂焊接试件，SiO2和TiO2活性剂使熔池峰值温度升高约7%～9%，NaF活性剂使熔池峰值温度降低约5%。此研究将丰富和发展活性激光焊接厚板的基础理论，为活性激光焊的推广应用提供重要理论和试验基础。

In order to study the effect of the active agent on the temperature of the molten pool of laser welding samples, the ANSYS 3-D finite element model of active laser welding was established with 304 stainless steel thick plate as the object. In the model, the welding temperature field was numerically simulated, and the infrared thermal imager was used to monitor the melting. Based on the comprehensive numerical calculation and experimental test data, the temperature variation trend of the specimens coated with different active agents and uncoated active agents during laser welding was compared and analyzed. The results show that the numerical simulation results are basically consistent with the experimental results. The application of the active agent does not have a significant effect on the temperature field distribution, but the peak temperature of the molten pool is slightly changed. Compared with the uncoated active agent welded specimens, SiO2 and TiO2 active agent respectively raises the peak temperature of the molten pool by about 7% to 9%, and the NaF active agent reduces the peak temperature of the molten pool by about 5%. This research will enrich and develop the basic theory of active laser welding thick plates, and provide important theoretical and experimental basis for the popularization and application of active laser welding.