为系统地分析激光焊接温度场的分布与焊接熔池参数之间的关系, 以TC4钛合金激光焊接为研究对象, 利用ANSYS软件建立有限元模型, 通过模拟计算获得温度场分布云图、热循环曲线。利用计算获得的温度场分布云图、热循环曲线预测激光焊接熔池的形状及停留的时间, 建立激光焊接温度与熔池深度的关系。研究结果表明, 模拟计算结果与实验数据非常吻合, 证明理论分析的可行性; 温度与熔池深度成正比关系, 在一定范围内, 温度越高, 相应的熔池深度越大, 计算结果显示, 焊件表面最高温约为250 ℃, 对应的最大熔池深度约为1.7 mm。

To analyze the relationship between the temperature distribution of laser welding and the parameters of welding pool systematically, TC4 titanium alloy was taken as the object of the research of laser welding. The finite element model was established by using ANSYS software. The nephogram of temperature distribution and welding thermal cycle were obtained by simulation. The calculated nephogram of temperature distribution and welding thermal cycle were used to predict the shape and duration of the welding pool. The relationship between the laser welding temperature and the welding pool depth was established. The results show that the simulation results are in good agreement with experimental results and prove the feasibility of the theoretical analysis. The temperature is proportional to the welding pool depth. In a certain range, the higher the temperature, the deeper the welding pool depth. The calculation results show that the highest temperature of welding surface is 250 ℃ and the corresponding maximum depth of welding pool is approximately 1.7 mm.