Please use this identifier to cite or link to this item: https://doi.org/10.15480/882.2837
Publisher DOI: 10.1016/j.jcsr.2020.106200
Title: Fatigue crack repair in welded structures via tungsten inert gas remelting and high frequency mechanical impact
Language: English
Authors: Al-Karawi, Hassan 
Bock und Polach, Rüdiger Ulrich Franz von 
Al-Emrani, Mohammad 
Keywords: Crack repair;Crack retrofitting;High frequency mechanical impact;Life extension;Pre-fatigue;TIG remelting
Issue Date: 29-Jun-2020
Publisher: Elsevier Science
Source: Journal of Constructional Steel Research (172): 106200 (2020-09-01)
Journal or Series Name: Journal of constructional steel research 
Abstract (english): Rehabilitation of welded structures has gained increasing attention lately. This paper aims at investigating the efficiency of Tungsten Inert Gas (TIG)-remelting and TIG-remelting followed by High Frequency Mechanical Impact treatment (TIG-HFMI) in fatigue life extension. Fatigue tests were carried out on as-welded and cracked specimens after treatment. The lives of the treated specimens increased remarkably by the two methods (TIG and TIG-HFMI). Many of the treated specimens ran-out after 10 million cycles of loading and failed at the clamping location when tested at a higher stress range. The improvement in compressive residual stresses, hardness values and weld toe radii were the reasons behind the life extension. These factors were used for fatigue life estimation in as-welded and TIG-treated specimens using the base metal S[sbnd]N curve. Moreover, the test results together with results from previous tests in the literature demonstrated that these methods can be useful for crack retrofitting as for new structures.
URI: http://hdl.handle.net/11420/6637
DOI: 10.15480/882.2837
ISSN: 0143-974X
Institute: Konstruktion und Festigkeit von Schiffen M-10 
Type: (wissenschaftlicher) Artikel
Funded by: The authors are grateful to the road administration (Trafikverket) and the innovation system agency in Sweden Vinnova (Infra Sweden 2030) who financed the whole project.
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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