Influence of the metallurgy on fatigue crack propagation in welded high strength steel jointsReport as inadecuate




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Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.Eriksson, Ingemar Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.Kaplan, Alexander Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.Keskitalo, M. University of Oulu.Mentyjärvi, K. University of Oulu.Show others and affiliations 2013 (English)In: 14th NOLAMP Conference: The 14th Nordic Laser Materials Processing Conference, August 26th – 28th 2013, Gothenburg, Sweden / [ed] Alexander Kaplan; Hans Engström, Luleå: Luleå tekniska universitet, 2013, 25-35 p.Conference paper, Published paper (Refereed)

Abstract [en] : A literature study of high strength steels, fatigue and fatigue assessment of welds has beenconducted and is briefly presented in this paper together with experiments on fatigue crackgrowth rates of laser welded high strength steel. It is well-known that the fatigue life ofwelded joints is heavily dependent upon the surface geometry and welding defects because ofcrack initiation from the high stress concentrations associated with these types of weldingflaws. However, the crack propagation through different weld zones of laser-welded highstrength steels and the corresponding impact from the metallurgy is not fully understood.The experiments comprise three-point bending fatigue tests on laser-welded highstrength steel with machined surfaces. Measurement of the fatigue crack propagation ratetransverse the weld and hence through the different metallurgy and hardness of the heataffected zone and of the weld can contain information on the impact of the metallurgy on thecrack propagation speed. The influence of different high strength steel grades and of differentwelding parameters on the crack propagation and fatigue life is discussed

Place, publisher, year, edition, pages: Luleå: Luleå tekniska universitet, 2013. 25-35 p.

National Category : Manufacturing, Surface and Joining Technology

Research subject: Manufacturing Systems Engineering

Identifiers: URN: urn:nbn:se:ltu:diva-38678Local ID: d226fbd6-5b41-43a2-a282-83e49280c3e5ISBN: 978-91-7439-688-1 (print)ISBN: 978-91-7439-689-8 (electronic)OAI: oai:DiVA.org:ltu-38678DiVA: diva2:1012179

Conference: Nordic Laser Materials Processing Conference : 26/08/2013 - 28/08/2013

Note: Godkänd; 2013; 20131210 (andbra)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved



Author: Sundqvist, Jesper

Source: http://ltu.diva-portal.org/



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