壁板结构焊接顺序模拟优化研究

Optimization of Welding Sequence for Welded Plate Structure

对于某壁板结构焊接顺序进行了数值模拟优化,主要考察了4块立板之间不同的焊接顺序、每块立板上各段焊缝焊接顺序的调整以及焊接起始端的选择对结构焊后变形的影响规律,模拟结果表明:壁板在各种顺序下都产生了马鞍型变形,即,沿焊缝纵向截面上产生了向下的挠曲变形,中部向下变形量最大;沿焊缝横向截面上产生了向上的挠曲变形,壁板两端部变形量较大,且壁板前端比后端变形大。在单块立板上采用先点固两端然后交错对称焊接,在整体上对4块立板依次焊接相同位置的焊缝,此时壁板焊后变形最小。

As an application of this FEM preprocessing system, simulation on welding process of missile’s oil box is performed, in which the effects of the welding sequence of four web plates and welds on each web plate are primarily analyzed. The simulation result shows that deformation under varied welding sequence is almost the same. Downward deflection deformation is obtained along weld longitudinal direction in structure as well as upward delfection deformation along weld traverse direction. The minimal deformation of structure is ob-tained by using the presented method that four web plates are ifrst tack welded on both ends, and then the web plates are staggered welded on both sides with the same welding sequence at the same time.