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Experiments and efficient simulations of distortions of laser beam–welded thin-sheet close beam steel structures
KTH Royal Institute of Technology, Department of Production Engineering and XPRES, Stockholm, Sweden.
University West, Department of Engineering Science, Research Enviroment Production Technology West. (PTW)ORCID iD: 0000-0001-8933-6720
KTH Royal Institute of Technology, Department of Production Engineering and XPRES, Stockholm, Sweden.
2018 (English)In: Proceedings of the Institution of mechanical engineers. Part B, journal of engineering manufacture, ISSN 0954-4054, E-ISSN 2041-2975Article in journal (Refereed) Epub ahead of print
Abstract [en]

In this article, geometrical distortions of steel structures due to laser beam welding were analyzed. Two 700-mm-long U-beam structures were welded in overlap configurations: a double U-beam structure and a U-beam/flat structure. The structures were in different material combinations from mild steel to ultrahigh-strength steel welded with different process parameters. Different measures of distortions of the U-beam structures were evaluated after cooling. Significant factors of the welding process and the geometry of the structures were identified. Furthermore, welding distortions were modeled using two predictive finite element simulation models. The previously known shrinkage method and a newly developed time-efficient simulation method were evaluated. The new model describes the effects of expansion and shrinkage of the weld zone during welding and material plasticity at elevated temperatures. The new simulation method has reasonable computation times for industrial applications and improved agreement with experiments compared to the often used so-called shrinkage method. © 2018, IMechE 2018.

Place, publisher, year, edition, pages
SAGE Publications Ltd , 2018.
Keywords [en]
Distortion (waves); High strength steel; Laser beam welding; Laser beams; Shrinkage; Steel structures; Thermal barrier coatings; Welds, Efficient simulation; Expansion and shrinkage; Finite element simulation model; Finite element simulations; Geometrical distortion; Material combination; Thin-sheet structures; Ultra high strength steel, Finite element method
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-12265DOI: 10.1177/0954405417749625Scopus ID: 2-s2.0-85045056604OAI: oai:DiVA.org:hv-12265DiVA, id: diva2:1202759
Note

First Published January 3, 2018

Available from: 2018-04-30 Created: 2018-04-30 Last updated: 2018-04-30Bibliographically approved

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Fahlström, Karl

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