Numerical Simulation and Control of Block Welding Deformation of Large Steel Deck
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摘要: 采用热弹塑性有限元方法开展了甲板分段焊接数值仿真,基于三维Shell单元和双椭球焊接热源模型获得了结构温度变化和应力场,得到了甲板分段焊接变形及残余应力分布特点,同时探究了纵向和横向型材15种焊接装配顺序以及3种甲板分段拘束形式对残余应力和焊接变形的影响规律。结果表明,所设计的对称交替焊接方法对应的焊接变形最小,即先从船舯向舷侧焊接纵骨,再从中间向两端交替焊接横向桁材,最后从船舯向舷侧焊接纵向桁材;在甲板分段边缘和中心施加压条约束可获得变形控制与工作量的最佳平衡;通过优化焊接顺序和约束方式,可有效实现大型甲板焊接精度控制。Abstract: The welding deformation of large steel deck blocks is studied by the thermal elastic plastic finite element method. The change of the structure and stress field can be obtained based on the 3D Shell element and the double ellipsoid heat source model, and then the welding deformation of large steel deck blocks and the residual stress distribution can be acquired. The influences of different welding sequences and fixture arrangements of the deck bocks on the residual stress and the welding deformation are studied. The results show that the deformation caused by the symmetry alternant welding method is the smallest. The welding deformation and the amount of work are both small when putting battens to the edge and center of the deck block. By optimizing the welding sequence and fixture arrangement, the welding of the large steel deck can be accurately controlled.
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Keywords:
- welding simulation /
- deck block /
- welding sequence /
- fixture arrangement /
- welding deformation
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