Prediction of Residual Stress and Welding Deformation Generated by Pipe Welding Through the Medium of Inherent Strain.

Abstract

A method of elastic theory with inherent strain is proposed for estimating residual stress and deformation in a pipe due to welding. Experiment of deflection was done for deciding conditions of numerical analysis on base of thermal elasto-plastic theory. Inherent strains were calculated under above useful conditions. By combining elastic theory and stress source of inherent strain, new equations are derived for calculating deflection and residual stress generated by circumfedential welding of pipe. The results of numerical analysis show a good agreement with the results predicted by the proposed equations.