Fatigue strength of normal and high strength steel joints improved by weld profiling

Publikationstyp
Journal Article
Publikationsdatum
2021-11-01
Sprache
English
Author
Braun, Moritz orcid-logo
Hensel, Jonas 
Song, Shi 
Ehlers, Sören 
Institut
Konstruktion und Festigkeit von Schiffen M-10 
TORE-URI
http://hdl.handle.net/11420/10468
Enthalten in
Engineering structures 
Volume
246
Article Number
113030
Citation
Engineering Structures 246: 113030 (2021-11-01)
Publisher DOI
10.1016/j.engstruct.2021.113030
Scopus ID
2-s2.0-85111806528
While some post-weld treatment techniques increase the fatigue life mainly due to induced compressive residual stress others are trying to create a smooth transition at weld toes. One of the latter is weld profiling. This study investigates the effect of weld profiling for four different steel types from S355 to S900 including one duplex stainless-steel and performs a comparison with high frequency mechanical impact (HFMI) treatment. The observed fatigue strength improvement is significantly higher than typically assumed for such techniques and comparable to increases observed for HFMI treatment. The fatigue strength further increases with parent material strength and is only slightly below the estimated fatigue strength of the parent material. Finally, fatigue design curves are proposed for weld profiling that include an increasing fatigue strength improvement for higher strength materials, but that are still conservative for low weld quality.
Schlagworte
Duplex-stainless steel
Fatigue strength improvement
High strength steel
Post-weld treatment
Weld toe grinding