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温度场是影响激光焊接焊缝成形质量的关键因素。针对非熔透型激光搭接焊接头焊缝成“钉头”状的特点,通过分析焊接时材料吸收激光能量的分布情况,提出了高斯面热源加线性递增式柱热源的复合体热源模型。模型考虑板间接触热阻的影响,并将计算结果和试验结果进行了对比,发现模拟出的焊缝形状和试验吻合较好;此外基于本模型对焊缝各处的热循环与焊缝组织形貌及显微硬度的关系进行了分析。结果表明,焊缝组织形貌及显微硬度除与加热和冷却速率有关外,峰值温度对其也有重要影响;在热循环基本一致的情况下焊缝的性能相似。该模型较准确地模拟了薄板激光深熔焊接熔池温度场,对研究激光深熔焊接温度场问题和激光工艺参数的优化选择具有参考价值。
Temperature field is the key factor that affects the quality of laser welding seam. According to the characteristics of laser welding of non-penetration laser lap welding joint, the heat energy of composite heated by Gaussian surface plus linear incremental column heat source was analyzed by analyzing the distribution of laser energy absorbed by the material during welding. model. The model considers the influence of the thermal contact resistance between the plates and compares the calculated results with the experimental results. It is found that the simulated weld shape is in good agreement with the experimental results. In addition, based on the model, Morphology and microhardness of the relationship was analyzed. The results show that, in addition to the heating and cooling rate, the microstructure and microhardness of the weld joint are also affected by the peak temperature. The performance of the weld joint is similar under the same thermal cycling. The model can accurately simulate the temperature field of deep lamellar welding of thin plate laser, which is of reference value for the study of temperature field of deep penetration laser welding and optimization of laser process parameters.