In this study, modified equivalent load method for welding distortion analysis is suggested to improve its accuracy. To avoid the excessive computational time for welding distortion analysis of large welded structures, shell element-based elastic analysis methods are widely used, applying the inherent deformation approach. Equivalent nodal forces are commonly used in common FE (Finite Element) codes to enter these inherent deformation values. However, the conventional method cannot estimate precise longitudinal bending following the conventional equation. In this study, the problem of the existing equivalent load method is analyzed by a case study, and the modified equivalent load method that can estimate angular distortion, transverse shrinkage, and longitudinal bending is presented based on the FEM principle. The results show that by applying the proposed method, the shell element-based elastic FE approach for the welding distortion analysis can be achieved with improved accuracy.

中文翻译：

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修正的等效载荷法进行焊接变形分析

在这项研究中，建议采用改进的等效载荷法进行焊接变形分析，以提高其准确性。为了避免大型焊接结构的焊接变形分析所需的过多计算时间，基于壳单元的弹性分析方法被广泛使用，并采用了固有变形方法。等效节点力通常用于常见的FE（有限元）代码中，以输入这些固有变形值。但是，常规方法不能按照常规公式估算精确的纵向弯曲。在本研究中，通过实例分析了现有等效载荷法的问题，并基于有限元原理提出了一种改进的等效载荷法，该方法可以估计角度变形，横向收缩和纵向弯曲。