后倾式离心风机叶轮机器人焊接工艺优化

在后倾式离心风机叶轮机器人焊接时，为了既保证焊缝质量又最大程度减小焊后变形量，综合运用热弹塑性有限元法和固有应变法对其焊接工艺进行优化。利用基于热弹塑性有限元法的Visual-Environment软件，结合双椭球热源模型对焊缝熔池情况进行数值模拟和实验验证，得到了最优焊接参数。在已知焊缝固有应变的情况下，采用基于固有应变法的Weld Planner软件对后倾式离心风机叶轮在不同焊接顺序和焊接方向下产生的变形进行了预测，得到了最优焊接顺序和焊接方向。运用得到的最优焊接工艺对后倾式离心风机叶轮进行试生产，其焊后变形情况与数值模拟得出的结果较为一致，满足产品的质量要求。

Welding Process Optimization on Robot Welding of the Backward Centrifugal Fan Impeller

To ensure weld seam quality and minimize post-welding deformation on robot welding of the backward centrifugal fan impeller, a combined approach integrating TEP-FEM and ISM were applied for welding process optimization. Optimal welding parameters were obtained through a numerical simulation and experimental validation of molten weld pool at weld seam by utilizing TEP-FEM-based Visual-Environment software, in combination with double ellipsoidal heat source model. Given the known inherent strain of weld seams, the post-welding deformations of the backward centrifugal fan impellers were numerically predicted under different welding sequences and welding directions with Weld Planner software based on ISM, the optimal welding sequence and welding direction were located. Pilot production is conducted by utilizing the optimal welding processes on backward centrifugal fan impellers. The resultant post-welding deformations are consistent with the numerical simulations, which meets the quality requirements of the products.