Fatigue strength assessment of TIG-dressed ultra-high-strength steel fillet weld joints using the 4R method

Post-weld treatments can enhance the fatigue strength of weldments by means of improving their geometry or residual stresses, or both. In this study, the fatigue strength of TIG-dressed non-load-carrying cruciform joints made of ultra-high-strength steel were analyzed using stress-based approaches,...

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Bibliographic Details
Published in:International journal of fatigue 2020-10, Vol.139, p.105745-14, Article 105745
Main Authors: Mettänen, H., Nykänen, T., Skriko, T., Ahola, A., Björk, T.
Format: Article
Language:English
Subjects:
4R method
Cruciform tests
Fatigue
Fatigue strength
Heat treating
High strength steel
High strength steels
Materials fatigue
Residual stress
TIG-dressing
Ultra-high-strength steel
Welded joints
Weldments
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Summary:Post-weld treatments can enhance the fatigue strength of weldments by means of improving their geometry or residual stresses, or both. In this study, the fatigue strength of TIG-dressed non-load-carrying cruciform joints made of ultra-high-strength steel were analyzed using stress-based approaches, i.e. nominal, structural, and effective notch stress (ENS) methods, and a multi-parametric approach, entitled the 4R method. Comparisons were made between the methods, along with the applied parameters, and the results showed the 4R and ENS approaches to have the best correspondence with the experimental test data, whereas the nominal and structural stress methods resulted in conservative fatigue strength estimations.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2020.105745