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利用固有应变法对不同焊接顺序的大型升船机承船厢底铺板横向、纵向变形量和扰度进行了模拟。结果表明,面板与横梁焊接时采用对称施焊可降低结构的扰度变形量,面板与次梁焊接时采用由外向内的对称焊接顺序可有效降低各方向的焊接变形。两侧横梁腹板向外扩张,面板发生收缩变形,底铺板整体结构发生弯曲变形。在实际焊接时,通过对两端横梁腹板加以拘束,对横梁腹板和面板进行反变形处理,达到了底铺板的精度控制要求。
The inherent strain method was used to simulate the transverse, longitudinal deformation and disturbance of the bottom of a shiplift with different welding sequences. The results show that the symmetrical welding can reduce the deformation of the panel when the panel and beam are welded. The symmetrical welding sequence from the outside to the inside of the panel and the secondary beam can effectively reduce the welding deformation in all directions. Both sides of the beam web outward expansion, the panel shrinkage deformation, the end of the overall plank bending deformation. In the actual welding, the beam web and the panel are subjected to anti-deformation by restraining the webs at the two ends to achieve the precision control requirements of the bottom plank.