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Svenungsson, JosefineORCID iD iconorcid.org/0000-0002-4988-4578
Publications (3 of 3) Show all publications
Svenungsson, J. (2019). Conduction laser welding: modelling of melt pool with free surface deformation. (Licentiate dissertation). Trollhättan: University West
Open this publication in new window or tab >>Conduction laser welding: modelling of melt pool with free surface deformation
2019 (English)Licentiate thesis, monograph (Other academic)
Abstract [en]

Laser welding is commonly used in the automotive-, steel- and aerospace industry. It is a highly non-linear and coupled process where the weld geometry is strongly affected by the flow pattern in the melt pool. Experimental observations are challenging since the melt pool and melt flow below the surface are not yet accessible during welding. Improved process control would allow maintaining, or improving, product quality with less material and contribute further to sustainability by reducing production errors. Numerical modelling with Computational Fluid Dynamics, CFD, provides complementary understanding with access to process properties that are not yet reachable with experimental observation. However, the existing numerical models lack predictability when considering the weld shape. The work presented here is the development of a model for conduction laser welding. The solver upon which the model is based is first described in detail. Then different validation cases are applied in order to test specific parts of the physics implemented. Two cases focus on thermocapillary convection in two-phase and three-phase flows with surface deformation. Finally, a third case considers the melt pool flow during conduction mode welding.It is concluded that the convection of fusion enthalpy, which was neglected in former studies, should be included in the model. The implementation of the thermo capillary force is recommended to be consistent with the other surface forces to avoid unphysical solution. Free surface oscillations, known from experimental observations, are also computed numerically. However, further investigation is needed to check that these oscillations are not disturbed b ynumerical oscillations.

Place, publisher, year, edition, pages
Trollhättan: University West, 2019. p. 119
Series
Licentiate Thesis: University West ; 27
Keywords
Conduction laser welding, numerical modelling, Computational Fluid Dynamics, OpenFOAM, free surface deformation, melt pool
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology; ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-13943 (URN)978-91-88847-35-5 (ISBN)978-91-88847-34-8 (ISBN)
Presentation
2019-06-10, 10:00 (English)
Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2019-12-10Bibliographically approved
Svenungsson, J. (2016). Keyhole laser process for welding Titanium alloy: modelling and experiment. In: : . Paper presented at Aerospace Technology Congress 2016, Stockholm, Sweden, October 11-12, 2016.
Open this publication in new window or tab >>Keyhole laser process for welding Titanium alloy: modelling and experiment
2016 (English)Conference paper, Oral presentation only (Other academic)
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology; ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-10580 (URN)
Conference
Aerospace Technology Congress 2016, Stockholm, Sweden, October 11-12, 2016
Available from: 2017-01-13 Created: 2017-01-13 Last updated: 2018-08-12Bibliographically approved
Svenungsson, J., Choquet, I. & Kaplan, A. F. .. (2015). Laser Welding Process: A  Review of Keyhole Welding Modelling. Paper presented at 15th Nordic Laser Materials Processing Conference, Nolamp 15. Physics Procedia, 78, 182-191
Open this publication in new window or tab >>Laser Welding Process: A  Review of Keyhole Welding Modelling
2015 (English)In: Physics Procedia, ISSN 1875-3892, E-ISSN 1875-3892, Vol. 78, p. 182-191Article in journal (Refereed) Published
Abstract [en]

Laser welding is used in several industrial applications. It can be distinguished between conduction mode and keyhole mode welding, between pulsed wave and cw laser welding and between CO2-lasers with a wavelength of 10 μm and various laser types of about 1 μm wavelength. A deeper understanding of laser welding allows improving weld quality, process control and process efficiency. It requires a complementary combination of precise modelling and experimental investigations. The here presented review focuses on modelling of laser keyhole welding, for both wavelength regimes. First, the fundamentals of the laser welding process and its physics such as beam propagation, keyhole formation and melt pool dynamics are addressed. The main approaches for modeling energy transfer from laser beam to keyhole surface as well as fluid flow in the material are then discussed. The most relevant publications are systematically structured, particularly categorized with regard to the respective physical phenomena addressed. Finally some open questions are underlined.

Keywords
keyhole, liquid flow, vapor flow, melting, vaporization, plasma, Fresnel absorptions, inverse Bremsstralhung absorption, modeling.
National Category
Applied Mechanics
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-8728 (URN)10.1016/j.phpro.2015.11.042 (DOI)2-s2.0-84965057063 (Scopus ID)
Conference
15th Nordic Laser Materials Processing Conference, Nolamp 15
Available from: 2015-12-01 Created: 2015-11-27 Last updated: 2017-12-01Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-4988-4578

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