Influence of Post-Heat Treatment Conditions on the Fatigue Life of T-Type Plate Fillet Welds

Influence of Post-Heat Treatment Conditions on the Fatigue Life of T-Type Plate Fillet Welds | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Influence of Post-Heat Treatment Conditions on the Fatigue Life of T-Type Plate Fillet Welds Nizam khan sazid, KyongHo CHANG, Mikihito Hirohata This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7508717/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 5 You are reading this latest preprint version Abstract Improving the fatigue life of welded steel structures remains a critical topic in structural engineering. Numerous studies have shown that residual stress and welding-induced deformation significantly influence fatigue performance. Post-weld heat treatment (PWHT) is widely employed to relieve residual stress; however, its effectiveness varies depending on the treatment temperature and method. Moreover, while PWHT can reduce residual stress, it may also increase or decrease welding deformation depending on the applied process, thereby affecting fatigue life. In this study, fatigue finite element (FE) analyses were conducted to evaluate the heating temperature and optimal positions of post-weld heat treatment (PWHT) to enhance the fatigue life of T-type plate fillet welds. Fillet welding was applied to a T-shaped steel specimen to reproduce welding-induced residual stress and deformation. The study investigated how the reduction in residual stress by post-weld heat treatment (PWHT), along with the accompanying welding deformation, affects fatigue life. A three-stage FE simulation was performed: (1) 3D non-steady heat conduction FE analysis to reproduce the post-heat treatment temperature, (2) 3D thermo-elasto-plastic FE analysis to assess the reduction in residual stress and changes in deformation, and (3) 3D fatigue analysis to investigate the resulting effects on fatigue life. The findings provide insight into optimizing PWHT parameters for improving the fatigue performance of welded steel structures. Post-heat treatment temperature (PWHT) Fatigue life 3D fatigue FE analysis Thermal elastoplastic FE analysis non-steady heat conduction FE analysis Residual stress Welding deformation Full Text Cite Share Download PDF Status: Under Review Version 1 posted Reviewers agreed at journal 29 Sep, 2025 Reviewers invited by journal 29 Sep, 2025 Editor invited by journal 25 Sep, 2025 Editor assigned by journal 03 Sep, 2025 First submitted to journal 01 Sep, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-7508717","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":522036860,"identity":"3545bba7-2de2-4bb7-ad94-d7ec07b4fb8f","order_by":0,"name":"Nizam khan sazid","email":"","orcid":"","institution":"Chung-Ang University - Seoul Campus: Chung-Ang University","correspondingAuthor":false,"prefix":"","firstName":"Nizam","middleName":"khan","lastName":"sazid","suffix":""},{"id":522036861,"identity":"3c0fea84-4f92-4318-837e-1b6cf782e95d","order_by":1,"name":"KyongHo 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