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J Weld Join > Volume 30(6); 2012 > Article
Journal of KWJS 2012;30(6):120-125.
DOI: https://doi.org/10.5781/KWJS.2012.30.6.120    Published online December 23, 2012.
A Study on the Thermal Distortion Analysis of Welded Structures having K/X Groove using shell elements
Yunsok Ha*, Jiwon Choi*
Correspondence:  Jiwon Choi,
Email: yunsok.ha@samsung.com
Because ships and offshore structures have very large dimensions and complicated shapes, it is difficult to determine the deformation or internal stress in the structure by simple lab tests. Thus, a rigorous analysis by using the computer simulation technology is essential for obtaining their distortions by considering the entire production process characteristics. The rapid development of computer technology made it possible to analyze the heat transfer phenomena, deformation and phase transformation in the welded joint. For large shell structures, shell elements modeling contributed primarily to this development. But if a welding is done by multi-pass, shell elements whose thickness are unchangeable can hard to describe the local situation. Recently, it was researched how to introduce the imaginary temperature for V grooved multi-layer butt welding in strain-boundary method (a kind of shrinkage methodologies). In the present study, we formulated the imaginary temperature for the double bevel and double V groove by considering the thickness change of each pass through the bead and the thickness directions simultaneously and also demonstrated the feasibility of the formula by applying it to the thermal distortion analysis of the erection process of crane pedestal.
Key Words: Thermal distortion, FEM, Multi-pass, Butt welding, Shell element, K groove, X groove

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