基于Weld-sta软件的船体结构焊接变形预测

预测船体复杂结构的焊接变形对制造工艺设计和精度控制具有重要的工程价值.基于固有应变理论,利用船体结构焊接变形预测专用软件Weld-sta对多用途船双层底结构焊接变形进行了预测,发现船长方向收缩最大变形量为13.2mm,船宽方向最大变形量14.5 mm.通过数值模拟结果与实验实测值的对比,可以得到软件计算的精度超过80%,验证了固有应变理论及软件用于焊接变形预测的可靠性,并在此基础上针对船体总段船台合拢的焊接变形进行了预测,发现焊接总收缩变形量为50.339 mm,与实际加工经验基本吻合.根据此结论可以针对各船体总段预留合理的焊接变形收缩量,验证了固有应变为基础的弹性板单元有限元预测法在船体总段合拢焊接中应用的可行性.

Welding deformation prediction of hull structure based on Weld-sta software

Prediction of welding deformation of hull complex structure has important engineering value to control the manufacturing process design and precision control. Based on the inherent strain theory,the prediction of welding deformation of Weld-sta software for the welding deformation is applied to multi-purpose ship double bottom structure of hull structure. We find that the captain direction shrinkage maximum deformation is 13. 2 mm and the maximum deformation of beam direction is 14. 5 mm. Through the comparison between numerical simulation results and experimental data,the accuracy of calculation is verified to be greater than 80%,and the inherent strain theory and the reliability of welding deformation prediction software are tested; the welding deformation of hull sections berth closure are predicted,welding shrinkage deformation is found to be 50. 339 mm,in agreement with the practical experience in processing. The conclusions can be used to reserve the reasonable welding deformation and shrinkage,verifing the feasibility of the inherent strain based elastic plate finite element method to be used in the welding of ship hull section closure.