Specification of Governing Factors for High Accurate Prediction of Welding Distortion

Lee, Jae-Yik; Chang, Kyong-Ho; Kim, You-Chul

doi:2013.31.5.1

J Weld Join > Volume 31(5); 2013 > Article

Special Issue

Journal of KWJS 2013;31(5):1-6.
DOI: https://doi.org/10.5781/KWJS.2013.31.5.1 Published online November 5, 2013.

Specification of Governing Factors for High Accurate Prediction of Welding Distortion

Jae-Yik Lee¹, Kyong-Ho Chang², You-Chul Kim³

Correspondence: Jae-Yik Lee,
Email: leejaeyik@gmail.com

Abstract

In carrying out the elastic-plastic analysis, four conditions (equilibrium equation, constitutive equation, condition of compatibility and yield condition) should be satisfied. In welding, the temperature largely changed from a melting temperature to a room temperature. So, yield stress of materials largely changed, too. In particular, yield stress becomes about zero over 700℃. The analysis should be carried out under the condition that equivalent stress generated in temperature increment ΔT did not exceed yield stress of materials at high temperature over 700℃. It should be sufficiently recognized that the obtained results were not reliable if this condition was not satisfied.

Key Words: Bead on plate, Welding distortion, Angular distortion, Accuracy, Shape of deposit metal, Thermal Elastic-Plastic analysis, Governing factor