Thermal Elasto-Plastic Analysis on Stress and Strain in Weld Metal during Multi-pass Welding

概要

論文の詳細を見る
This paper is concerned with the elasto-plastic analysis of thermal stresses and strains in weld metal of multi-pass butt welding. An analysis is performed based on the incremental theory under one dimensionally distributed tempera-ture. Numerical calculations are made for two kinds of weld joint as shown in Figs. 1(b), (c), each of which corresponds to the behavior of the transverse and longitudinal direction of weld joint respectively. It is assumed that a rectangular distribution of initial temperature is given at the start of each pass and heat flow occurs only in y-direction. Another assumption applied to the calculations is that a line heat source is given at the start of each pass and two dimensional heat flow occurs. From the calculations are estimated transient thermal stress and plastic strain distributions. The effects of weld conditions on residual stress and strain are clarified. The relations between plastic strain on the back surface of the first pass and angular distortion under several weld conditions are also obtained.
大阪大学の論文