ABSTRACT

A precise estimation of the welding deformation is an essential process in improving steel fabrication processes for building ships and offshore structures. This study validated the effect of the optimal simultaneous welding on the mitigation of welding displacements. Most previous studies on the optimised welding sequence for the reducing welding displacements have focused on one welding line at each order. However, in heavy industries, several welders or robotic welding machines generally work together to efficiently spend work time. Herein, inherent strain theory is introduced to calculate the complex mechanical behaviour during a welding operation using the elastic finite element method (FEM). Multipoint constraint function and the interface element theory are employed to consider the relationship of the different welded parts. The impact of the optimal simultaneous welding in the sequence on the reduction of welding displacement is validated by using the proposed numerical method in the present study.

摘要

焊接变形的精确估计是改进用于建造船舶和海上结构的钢制造工艺的重要过程。本研究验证了最佳同时焊接对减轻焊接位移的影响。大多数先前关于减少焊接位移的优化焊接顺序的研究都集中在每个订单的一条焊接线上。然而，在重工业中，几个焊工或机器人焊接机通常一起工作以有效地花费工作时间。本文引入固有应变理论，使用弹性有限元法 (FEM) 计算焊接操作过程中的复杂机械行为。采用多点约束函数和界面元理论来考虑不同焊接部位的关系。