Study on the relationship between the root welding residual stress and the root-failure fatigue strength of Plug Welded specimens

Q4 Materials Science

Welding International Pub Date : 2023-05-26 DOI:10.1080/09507116.2023.2203965

Yukihide Yoshihara, N. Osawa, H. Murakawa, Taiyou Kagase

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Abstract

Abstract It is difficult to examine the relation between the root notch welding residual stress (WRS) and the root-failure fatigue strength because of the difficulty in the direct root WRS measurement. The root WRS can be calculated by thermal elastic-plastic finite element analysis (TEPFEA), but its accuracy has not been fully verified yet. In this study, root-failure fatigue tests, in which direct root WRS measurement can be performed, are carried out. Plug welded (PW) specimens with backing plates are used in those tests, and the root WRS in as-welded (AW) and stress-relieved (SR = PWHT) specimens are measured using X-ray diffraction (XRD) method by cutting off the backing plate. The measured WRSs are compared with those calculated by TEPFEA. It is found that the root WRSs in the PW specimens estimated by TEPFEA become much larger than those measured when creep strain is neglected. The SR specimen’s fatigue strength improvement ratio is estimated by using the mean stress effect formulas developed for toe-failure cases (IIW Fatigue Recommendations and MIL-HDBK-5D). The estimated improvement ratio shows fair agreement with that measured.

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塞焊试件根部焊接残余应力与根部破坏疲劳强度关系的研究

摘要根部缺口焊接残余应力（WRS）与根部失效疲劳强度之间的关系由于难以直接测量而难以检验。根部WRS可以通过热弹塑性有限元分析（TEPFEA）来计算，但其准确性尚未得到充分验证。在本研究中，进行了根部失效疲劳试验，其中可以进行直接的根部WRS测量。这些试验中使用了带垫板的塞焊（PW）试样，焊后（AW）和应力消除（SR）中的根部WRS = 使用X射线衍射（XRD）方法通过切割背板来测量焊后热处理（PWHT）试样。将测得的WRS与TEPFEA计算的WRS进行了比较。研究发现，在忽略蠕变应变的情况下，TEPFEA估计的PW试样中的根部WRS比测量的要大得多。SR试样的疲劳强度提高率是通过使用为脚趾失效情况开发的平均应力效应公式（IIW疲劳建议和MIL-HDBK-5D）来估计的。估计的改善率与实测的改善率大致一致。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Welding International Materials Science-Metals and Alloys

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： Welding International provides comprehensive English translations of complete articles, selected from major international welding journals, including: Journal of Japan Welding Society - Japan Journal of Light Metal Welding and Construction - Japan Przeglad Spawalnictwa - Poland Quarterly Journal of Japan Welding Society - Japan Revista de Metalurgia - Spain Rivista Italiana della Saldatura - Italy Soldagem & Inspeção - Brazil Svarochnoe Proizvodstvo - Russia Welding International is a well-established and widely respected journal and the translators are carefully chosen with each issue containing a balanced selection of between 15 and 20 articles. The articles cover research techniques, equipment and process developments, applications and material and are not available elsewhere in English. This journal provides a valuable and unique service for those needing to keep up-to-date on the latest developments in welding technology in non-English speaking countries.