薄板構造物の溶接組立における変形予測(第一報)

—ギャップおよび目違いを考慮した変形予測—

抄録

The welding distortion of a plate structure during the assembly process is influenced not only by the local shrinkage due to the welding thermal cycle but also by the root gap and the misalignment. The former is governed by the heat input. Meanwhile, the latter is strongly affected by the welding procedure, such as the welding sequence and restraint on the joint to be welded. In this research, a method to predict the precision of plate structures during assembly process considering these factors is developed. The proposed method employs the concept of inherent strain and the interface element to consider both the local shrinkage due to welding and the gap and the misalignment in weld joint. The proposed method is applied to study the influence of welding sequence on the distortion of the structure during assembly by welding.