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JWJ > Volume 31(5); 2013 > Article
Journal of KWJS 2013 October;31(5) :15-19.
Published online November 4, 2013.
doi:https://doi.org/10.5781/KWJS.2013.31.5.15
Prediction of Welding Imperfection with Idealization of Welding and Their Accuracy
Jae-Yik Lee1, Kyong-Ho Chang2, You-Chul Kim3
1Research Institute of industrial Science & Technology, Incheon, 406-840, Korea
2Dept. of Civil, Environmental & Plant Eng., Chung-Ang Univ., Seoul, 156-756, Korea
3JWRI of Osaka University, 11-1, Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
Correspondence: Jae-Yik Lee  Email: leejaeyik@gmail.com
  Published online November 4, 2013
ABSTRACT
In order to reduce a grand compute time in prediction of welding distortion and residual stress by 3D thermal elastic plastic analysis, idealization of welding that is methods to heat input simultaneously in all weld metal on the same welding direction is carried out on two weld joints(butt welding and fillet welding). Then, the accuracy of acquired results is investigated through the comparison of the high accuracy prediction results. The thermal conduction analysis results by idealization of welding, the temperature is raised accompany with beginning of heat input because all of weld metal is heated input at the same time. On the other side, the temperature witch predicted with high accuracy is raised at the moment heating source passes the measuring points. So, there is difference of time between idealization of welding and considering of moving heat source faithfully. However, temperature history by idealization of welding is well simulated a high accuracy prediction results.
Keywords: Welding imperfection | Welding distortion | Residual stress | Idealization of welding | CPU time | 3D thermal elastic- plastic analysis
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