大型复杂结构件高效焊接热源

Research on efficient welding heat source model for large and complex structures

文中基于分段化思想,建立了以焊缝等效温度为控制参数的分段移动温控型体热源模型,并利用Q345B平板对接焊模型对其进行模拟验证.同时以计算时间、计算精度为基准,基于不同网格尺寸,对分段移动温控型热源、逐点移动双椭球体热源、分段移动双椭球体热源三种热源模型的计算效率进行对比分析.结果表明,文中提出的分段移动温控型体热源模型所获得的残余应力和变形与逐点移动双椭球体热源模拟结果趋势一致,其计算精度与分段移动双椭球体热源相当,但计算效率更高,在复杂结构件上的使用效果更突出.

Based on the sectional theory,the segmented moving temperature-controlled volume heat source model was proposed by using weld equivalent temperature as control variables,and it was verified through Q345 B flat butt welding model.With calculation time and accuracy as a reference,based on dif-ferent mesh sizes,the computing efficiency was compared between three kinds of heat source models including the segmented moving temperature-controlled heat source model,the double ellipsoid heat source model and the segmented moving double ellipsoid heat source model. The results showed that the trend of residual stress and deformation of the proposed model was consistent with that of the moving double ellipsoid heat resource model,and its accuracy was similar to that of the segmented moving double ellipsoid heat source model,but the calculation time is shorter. Particularly,the effect was more prominent on the large and complex structures.