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Improving fatigue strength of welded 1300 MPa yield strength steel using HFMI treatment or LTT fillers
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0003-4978-390X
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0003-2560-0531
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-8822-2705
2017 (English)In: Engineering Failure Analysis, ISSN 1350-6307, E-ISSN 1873-1961, Vol. 79, no September, 64-74 p.Article in journal (Refereed) Epub ahead of print
Abstract [en]

Fatigue improvement techniques are widely used to increase fatigue strength of welded high strength steels. In this paper high frequency mechanical impact (HFMI) and a Low Transformation Temperature (LTT) filler material were employed to investigate the effect on fatigue strength of welded 1300 MPa yield strength steel. Fatigue testing was done under fully reversed, constant amplitude bending load on T-joint samples. Fatigue strength of LTT welds was the same as for welds produced using a conventional filler material. However, HFMI treatment increased the mean fatigue strength of conventional welds about 26% and of LTT welds about 13%. Similar distributions of residual stresses and almost the same weld toe radii were observed for welds produced using LTT and conventional consumables. HFMI increased the weld toe radius slightly and produced a more uniform geometry along the treated weld toes. Relatively large compressive residual stresses, adjacent to the weld toe were produced and the surface hardness was increased in the treated region for conventional welds after HFMI. For this specific combination of weld geometry, steel strength and loading conditions HFMI treatment gave higher fatigue strength than LTT consumables.

Place, publisher, year, edition, pages
Oxford: Pergamon Press, 2017. Vol. 79, no September, 64-74 p.
Keyword [en]
Fatigue strength; Low transformation temperature welding consumable; High frequency mechanical impact treatment; High strength steel; Residual stress
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-10923DOI: 10.1016/j.engfailanal.2017.04.024OAI: oai:DiVA.org:hv-10923DiVA: diva2:1091682
Available from: 2017-04-27 Created: 2017-04-27 Last updated: 2017-05-02Bibliographically approved

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Harati, EbrahimSvensson, Lars-ErikKarlsson, Leif
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Citation style
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