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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, Sweden.
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB. University West, Sweden.ORCID iD: 0000-0001-8933-6720
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB. KTH Royal Institute of Technology, Sweden.
2018 (English)In: Proceedings of the Institution of mechanical engineers. Part B, journal of engineering manufacture, ISSN 0954-4054, E-ISSN 2041-2975, Vol. 233, no 3, p. 787-796Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
2018. Vol. 233, no 3, p. 787-796
Keywords [en]
distortions, finite element simulations, Laser beam welding, thin-sheet structures, ultrahigh-strength steel, Distortion (waves), High strength steel, Laser beams, Shrinkage, Steel structures, Thermal barrier coatings, Welds, Efficient simulation, Expansion and shrinkage, Finite element simulation model, Geometrical distortion, Material combination, Ultra high strength steel, Finite element method
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-34551DOI: 10.1177/0954405417749625Scopus ID: 2-s2.0-85045056604OAI: oai:DiVA.org:ri-34551DiVA, id: diva2:1237542
Available from: 2018-08-09 Created: 2018-08-09 Last updated: 2019-05-27Bibliographically approved

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Fahlström, Karl

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