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JWJ > Volume 33(1); 2015 > Article
Journal of Welding and Joining 2015 February;33(1) :24-29.
Published online February 28, 2015.
doi:https://doi.org/10.5781/JWJ.2015.33.1.24
Characterization of residual stress distribution of thick steel weld by contour method
Dong-Kyu Kim*, Wanchuck Woo**, Youn-Hee Kang**
*Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea
**POSCO Technical research lab., Mechanical Facility Research Group, Pohang 790-785, Korea
Correspondence: Dong-Kyu Kim  Email: kimdk@kaeri.re.kr
  Published online February 28, 2015
ABSTRACT
Residual stresses arising from the materials processing such as welding and joining affect significantly the structural integrity depending on the external loading condition. The quantitative measurement of the residual stresses is of great importance in order to characterize the effects of the residual stresses on the structural safety. In this paper, we introduce a newly devised destructive technique, the contour method (CM), which is applied for the measurements of the residual stress distributions through the thickness of a 80 mm thick steel weld. Residual stresses are evaluated from the contour, which is the normal displacement on a cut surface produced by the relaxation of residual stresses, using a finite element model. The CM provides a two-dimensional map of the residual stresses normal to the cut surface. The CM developed in the present study was validated in comparison with the residual stress distribution determined by a well-established neutron-diffraction residual stress instrument (RSI) instrumented in HANARO neutron research reactor.
Keywords: Welding | Residual stress | Contour method | Neutron diffraction
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