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Fatigue strength of normal and high strength steel joints improved by weld profiling
https://orcid.org/0000-0001-9266-1698
Graphical abstract Display Omitted
Highlights Tests of four different steel types showed steady increase with yield strength. The highest observed increase was 285% higher than the as-welded state. And about 170% higher than the current IIW, AWS and DVS recommendation for grinding. Weld profiling leads to higher fatigue strength towards the LCF region than HFMI. Step-wise increase of reference fatigue strength up to five FAT classes is proposed.
Abstract 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.
Fatigue strength of normal and high strength steel joints improved by weld profiling
https://orcid.org/0000-0001-9266-1698
Graphical abstract Display Omitted
Highlights Tests of four different steel types showed steady increase with yield strength. The highest observed increase was 285% higher than the as-welded state. And about 170% higher than the current IIW, AWS and DVS recommendation for grinding. Weld profiling leads to higher fatigue strength towards the LCF region than HFMI. Step-wise increase of reference fatigue strength up to five FAT classes is proposed.
Abstract 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.
Fatigue strength of normal and high strength steel joints improved by weld profiling
https://orcid.org/0000-0001-9266-1698
Graphical abstract Display Omitted
Highlights Tests of four different steel types showed steady increase with yield strength. The highest observed increase was 285% higher than the as-welded state. And about 170% higher than the current IIW, AWS and DVS recommendation for grinding. Weld profiling leads to higher fatigue strength towards the LCF region than HFMI. Step-wise increase of reference fatigue strength up to five FAT classes is proposed.
Abstract 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.
Fatigue strength of normal and high strength steel joints improved by weld profiling
Braun, Moritz (author) / Hensel, Jonas (author) / Song, Shi (author) / Ehlers, Sören (author)
Engineering Structures ; 246
2021-08-13
Article (Journal)
Electronic Resource
English
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