多層溶接周継手における溶接順序が残留応力に及ぼす影響

概要

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Welding residual stress in a multi-pass butt-welded pipe joint was calculated for various welding sequences by thermal elastic plastic analysis using the finite element method. The 5600-mm-diameter, 50-mm-thick pipe joint was prepared for both side grooves. The distribution of residual stress depends on differences in the sequence of welding passes. The optimal sequence considering practical use is determined such that the axial residual stress on the inner surface in the heat affected zone becomes a minimum, because the enviroment at this point for the stress corrosion cracking is severer. The production mechanism of welding residual stress at the pipe joint was studied in detail using a simplified method proposed in this paper. This method of estimating residual stress in pipe joints was validated by comparison with the computed results.
社団法人日本機械学会の論文
1996-12-25