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


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