钛合金薄板激光对接焊温度场的数值模拟

为了分析激光对接焊TC4钛合金薄板的焊接过程,以ANSYS软件为平台采用有限单元法建立了非线性瞬态热传导模型,模拟计算了焊接时的3维瞬态温度场;数值模拟过程中考虑了材料热物理性能参量的温度依存性,并利用APDL语言编程实现了移动高斯分布面热源模型的加载。结果表明,激光焊接过程中的温度场由非稳态到稳态,最终呈现出流星状的稳定分布,焊缝附近等温线密集,焊缝的热影响区小;模拟得到的焊缝形状与试验获得的焊缝形状相吻合;模拟获得的400℃临界温度以上区域的尺寸范围为42.00mm10.56mm。该研究验证了模拟方法的正确性,为焊接保护装置设计提供了依据。

Numerical simulation of the temperature field of laser butt welding of titanium alloy sheet

In order to analyze the laser butt welding process of Ti6Al4V(TC4)alloy sheet, a nonlinear transient heat conduction model was established by means of the finite element analysis and the distribution of the 3-D transient temperature was calculated with ANSYS. In the process, it was taken into account that the material thermophysical properties varied with temperature, and the loading and moving of the Gaussian heat source were realized using the APDL programming languages. The results show that the temperature field changes from non-steady state to state, and eventually present a stable meteor-shape distribution, the isotherms are dense near the weld and the heat affected zone is narrow. The simulated weld profile matches well with the experiment result. According to the simulation results, the dimension of the area where temperature is above 400℃ is 42.00mm10.56mm. The study proved the correctness of the simulation method, and provided references for the design of welding protection device.