Capability of weld seam improvement techniques for the fatigue strength optimization of welded high strength steels

  Fatigue-loaded welded constructions are mainly designed according to the experimental results of low-strength steels, although great knowledge about the properties of modern high-strength steels is available. Due to the increasing notch sensitivity with increasing yield strength, the applicable lo...

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Bibliographic Details
Published in:Welding in the world 2023, Vol.67 (6), p.1575-1580
Main Authors: Werner, Tom, Nitschke-Pagel, Thomas, Dilger, Klaus
Format: Article
Language:English
Subjects:
Base metal
Chemistry and Materials Science
Cyclic loads
Fatigue strength
High strength steels
Materials Science
Mathematical analysis
Metal fatigue
Metallic Materials
Notch sensitivity
Optimization
Research Paper
Seam welds
Solid Mechanics
Theoretical and Applied Mechanics
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Summary:  Fatigue-loaded welded constructions are mainly designed according to the experimental results of low-strength steels, although great knowledge about the properties of modern high-strength steels is available. Due to the increasing notch sensitivity with increasing yield strength, the applicable load amplitudes are mostly independent of the steel grade. This paper presents various options for exploiting the potential of high-strength steels subjected to cyclic loads. Therefore, different post-weld treatments are investigated. The calculated fatigue strength is thereby based on IIW guidelines. The results indicate a high potential for an increase in fatigue strength up to a calculated FAT class with a variable slope of FAT392. This is considerably higher than the currently valid base metal level of FAT160.
ISSN:0043-2288
1878-6669
DOI:10.1007/s40194-023-01485-8