压力机机身特厚板组合件焊接路径优化

Optimization on welding path of super-thick plate assembly part for press frame

根据厚板焊接时热量的传递特性,利用热弹塑性有限元法和并行计算技术并借助先进的CAE分析软件对160 t C型压力机机身特厚板组合件进行热-力耦合计算和焊接路径优化。首先采用hypermesh软件进行网格划分,建立有限元模型;然后选用最接近二氧化碳电弧焊熔池精度的恒温三维双椭球热源模型,建立最接近现场的边界条件,并使用并行计算进行模拟;最后通过变形计算结果分析获得了最佳的焊接工艺方法。结果表明,对厚板相邻两边的K形焊缝施焊时,要保证对每一边第一道焊均处于板的同侧;对组合件焊接时,先对结构进行打底焊然后在进行盖面焊,其焊接变形最小。

According to the heat transfer characteristics of welded plates, the numerical simulation on the thermal-mechanical couple and the optimization of the welding path were performed on the 160 t C-type super-thick plate assembly part of press frame by the elastic-plastic finite element method, parallel computing technology and the advanced CAE software. First, finite element model was established and meshed by hypermesh software. Then, 3D double ellipsoid heat source model with constant temperature which is the closest to welding pool accuraty of the CO2 arc was chosen, and the boundary conditions which are the closest to the actual boundary were chosen, and the simulation was realized by the parallel computing. FinaUy the optimum method of welding was obtained by analyzing the results of deformation calculation. The results show that when K-shaped seam of adjacent two sides of the plate is welded, it is necessary to ensure that the first-pass welding seam on each side of the plate is in the same side, however, when assembly workpieces are welded, backing weld of the structure should be performed first and then that of the capping in order to obtain the smallest welding deformation during welding.