EO反应器20MnMoNb特厚度管板拼焊残余应力与变形有限元模拟

利用有限元ABAQUS软件，对国产EO反应器20MnMoNb特厚度管板拼焊制造过程进行有限元模拟，得到了390mm厚的特厚板对接焊残余应力与变形的分布规律．焊接采用双U形坡口，两面交替焊接，并在焊缝两侧的板面上施压4500kN的配重以限制管板的变形．结果表明，特厚度管板焊后在钢板内部为残余压应力，而靠近两外表面，特别是在焊缝及热影响区内，为较大的残余拉应力．施压配重的方法有效地限制了管板的翘曲变形，且施压配重的重量越大，板的变形程度越低，但是变形被限制的同时也增加了板内的残余应力，配重重量的选择需要兼顾其对变形和应力两者的共同影响．

Finite element simulation on residual stress and deformation for welding joint of 20MnMoNb super-thick tube sheet of ethylene oxide reactor

By using finite element program Abaqus, the butt-welding process of 390 mm 20MnMoNb super-thick plates for manufacturing the tube-sheet of a Chinese ethylene oxide reactor was simulated.The distribution of welding residual stress and deformation was obtained.The welding grove was double U-shape and it was welded alternatively on both sides by turning the plates regularly with large cranes.In order to avoid the excessive deformation of the plates, external loads were applied on the plates away the joint.According to the simulations, compressive residual stress has been generated within the plate, while tensile stress has been found on the external sides.By applying external load, deformation was controlled effectively.The more load is applied, the less the plate will deform.However, the residual stress will increase as the external load increases.Therefore, the balance between deformation and load should be considered.