Prediction of Welding Residual Stresses in T-and I-Joints Using Inherent Strains

A predicting method of welding residual stress using source of residual stress (Report 3)

Abstract

A new method for prediction of welding residual stress was proposed. The prediction is realized by an elastic analysis using inherent strain as the source of residual stress. In this paper, the method is extended for the prediction of residual stresses in welded T- and I-joints.
Inherent strains in T- and I-joints were calculated from residual stresses which were obtained by thermal elastoplastic analysis. It is found that the distributions of inherent strain in the flange side and web side near the weld part are the same provided that the widths of flange and web are not considerably different. The inherent strain distributions in the vicinities of two weld parts of I-joint are both the same as one in T-joint of the same geometrical sizes. Two simple formulae are presented to predict the width and magnitude of inherent strain distribution in T- and I-joints corresponding to the specified welding conditions.
It is demonstrated that the proposed method predicts welding residual stresses accurately by an elastic analysis imposing the inherent strain in the same order as actual welding building-up procedure.