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JWJ > Volume 31(5); 2013 > Article
Journal of KWJS 2013 October;31(5) :7-14.
Published online November 5, 2013.
doi:https://doi.org/10.5781/KWJS.2013.31.5.7
Verification of Validity of Governing Factors in High Accurate Prediction of Welding Distortion
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 5, 2013
ABSTRACT
The legitimacy of dominating factor in the high accuracy prediction of welding distortion was investigated for butt welding and fillet welding. When out-of-plane distortion was measured by the experiment objecting to butt welding, if tack welding was easily performed, the position of a neutral axis was variously changed by the irregularity. Then, there have been a case that out-of-plane distortion was generated in the unexpected direction. This case should be especially noted. New model for the experiment was proposed so as to solve this problem. As it was elucidated by the case of fillet welding, it was verified that the analysis should be carried out with satisfying the yield condition (especially at high temperature above 700 degree Celsius) and with closely simulating the penetration shape (heat input in weld metal) in order to solve the proposition that is the high accuracy prediction of welding distortion. It was confirmed that residual stress is highly predicted because welding distortion is highly predicted, too.
Keywords: Butt welding | Fillet welding | Welding distortion | Residual stress | High accurate prediction | Governing factor in prediction
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