PSI - Issue 75

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia (2025) 000 – 000

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ScienceDirect

Procedia Structural Integrity 75 (2025) 426–434

© 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Dr Fabien Lefebvre with at least 2 reviewers per paper Abstract Given the substantial environmental and economic consequences associated with deteriorating infrastructure, prolonging the service life of steel bridges is essential for advancing sustainability and economic viability. A critical factor in achieving this g oal is enhancing the integrity of welded joints, which play a pivotal role in the bridge’s performance under dynamic loading conditions. Research indicates that the fatigue strength of welds can be increased by up to sixfold through the application of a nanometallic multilayer (NMM) composed of nickel and copper. To date, investigations into the fatigue enhancement of welded joints using NMM have predominantly been conducted on a laboratory scale. To enable practical application on existing infrastructure, a coating device is being developed to apply the NMM treatment directly onto surfaces without the need for full immersion in an electrolyte bath, thus supporting its implementation as a post-treatment process for steel bridges. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2025 organizers Keywords: Nanometallic Multilayer, Post-weld Treatment, 3D-Printing, In-Situ Coating, Fatigue Resistance, Steel Bridges 1. Introduction Due to increasing resource scarcity and the ongoing deterioration of the global climate, the conservation of materials and the extension of the service life of steel structures are becoming increasingly important. One of the primary factors contributing to damage and reduced longevity in steel bridges is fatigue failure at welded joints. It is estimated that over 50 % of engineering products worldwide contain weld seams (Aucott et al., 2017). Given that cracks frequently initiate at these locations, the structural integrity of steel structures is critically influenced by the properties of their Fatigue Design 2025 (FatDes 2025) Enhancing the Lifespan of Steel Structures through a 3D-printed Coating Device for the Application of a Nanometallic Multilayer on Weld Seams Maren Seidelmann * , Niclas Spalek, Mohsen Falah, Nikolay Lalkovski, Marcus Rutner Hamburg Institute of Technology, Denickestraße 17, 21073 Hamburg, Germany

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2025 organizers

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Dr Fabien Lefebvre with at least 2 reviewers per paper 10.1016/j.prostr.2025.11.042