厚钢板对接焊接三维有限元数值模拟与分析

3-D Finite Element Numerical Simulation and Analysis on Butt Welding of Thick Steel Plate

采用有限元数值模拟方法,建立考虑热-固耦合效应的钢板对接焊接的三维有限元模型,运用生死单元技术模拟焊接全过程,从焊接残余变形和残余应力的角度,验证了分析模型的有效性,并分析了板件边界约束、焊接层数与道数、板件厚度、焊接顺序以及施工工艺对计算结果的影响。探讨了简化计算的可能性与正确性,并考虑了保温和设置支撑等施工工艺对焊接施工的影响。研究成果可为设计与施工提供一定的参考。

Finite element numerical simulation was adopted to erect 3-D finite element model , considering heat-solid coupling effect .Meanwhile ,live-dead element technology was applied to simulate the whole welding process .The effectiveness of the model was verified in the aspects of residual deformation and residual stress .The influences of plate boundary constraint ,welding layer and pass ,plate thickness ,welding sequence and construction process on the behavior of steel plates on calculation results were analyzed . The possibility and correctness of simplified calculation were discussed .The influences of construction techniques such as heat preservation and support setting on welding were considered .The conclusions can provide some references to welding design and construction .