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Computation of residual stresses for a repair weld case

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Abstract

The target of EU FP7 STYLE project “Structural integrity for lifetime management – non-RPV component” was to improve and unify the methods of a structural integrity assessment in the ageing and lifetime management of reactor coolant pressure boundary components. One of the mock-ups in the project was manufactures from two pipes welded together. After completion of the girth weld, a deep weld repair was inserted into the girth weld. As a part of the work, round-robin finite element computations were performed to determine residual stresses after repair welding and the computational results were compared to the deep hole drilling measurements. In this paper, the details and recomputed results of one of the analyses is presented. A part of the input data was generated with in-house codes. Sequential thermal and mechanical analyses were performed with a small strain and displacement formulation. The comparison of computed and measured temperatures and stresses shows good agreement. The computed hoop stress at the repair mid-length was higher than the axial stress. Both stresses were tensile through the wall thickness. Confidence in the results was also gained as the results were compared to those presented in the literature for a repair welding case.

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Acknowledgments

This work was a part of the EU granted project “Structural integrity for lifetime management – non-RPV components (STYLE)”. In addition to EU, this work was also partly funded by VTT Technical Research Centre of Finland Ltd. The work was a part of the Work Package 2.2 of the STYLE project (2010–2013). The primary objective of the WP2.2 simulation round robin was to provide accurate predictions of weld residual stresses concerning a mock-up and to compare the computational and experimental results against each other.

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  1. VTT Technical Research Centre of Finland, Kemistintie 3, Espoo, 02044-VTT, Finland

    Heikki Keinänen

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  1. Heikki Keinänen
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Correspondence to Heikki Keinänen.

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Recommended for publication by Commission X - Structural Performances of Welded Joints - Fracture Avoidance

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Keinänen, H. Computation of residual stresses for a repair weld case. Weld World 60, 507–513 (2016). https://doi.org/10.1007/s40194-016-0323-y

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  • DOI: https://doi.org/10.1007/s40194-016-0323-y

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