Numerical assessment and experimental verification of the influence of the Hartmann effect in laser beam welding processes by steady magnetic fields

dc.contributor.authorBachmann, Marcel
dc.contributor.authorAvilov, Vjaceslav
dc.contributor.authorGumenyuk, Andrey
dc.contributor.authorRethmeier, Michael
dc.date.accessioned2020-09-15T14:47:01Z
dc.date.available2020-09-15T14:47:01Z
dc.date.issued2015-11-18
dc.description.abstractControlling the dynamics in the weld pool is a highly demanding challenge in deep-penetration laser beam welding with modern high power laser systems in the multi kilowatt range. An approach to insert braking forces in the melt which is successfully used in large-scaled industrial applications like casting is the so-called Hartmann effect due to externally applied magnetic fields. Therefore, this study deals with its adaptation to a laser beam welding process of much smaller geometric and time scale. In this paper, the contactless mitigation of fluid dynamic processes in the melt by steady magnetic fields was investigated by numerical simulation for partial penetration welding of aluminium. Three-dimensional heat transfer, fluid dynamics including phase transition and electromagnetic field partial differential equations were solved based on temperature-dependent material properties up to evaporation temperature for two different penetration depths of the laser beam. The Marangoni convection in the surface region of the weld pool and the natural convection due to the gravitational forces were identified as main driving forces in the weld pool. Furthermore, the latent heat of solid–liquid phase transition was taken into account and the solidification was modelled by the Carman–Kozeny equation for porous medium morphology. The results show that a characteristic change of the flow pattern in the melt can be achieved by the applied steady magnetic fields depending on the ratio of magnetic induced and viscous drag. Consequently, the weld bead geometry was significantly influenced by the developing Lorentz forces. Welding experiments with a 16 kW disc laser with an applied magnetic flux density of around 500 mT support the numerical results by showing a dissipating effect on the weld pool dynamics.en
dc.identifier.eissn1778-4166
dc.identifier.issn1290-0729
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/11684
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-10572
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subject.ddc621 Angewandte Physikde
dc.subject.otherelectromagnetic weld pool controlen
dc.subject.otherHartmann effecten
dc.subject.otherlaser beam weldingen
dc.subject.otherLorentz forceen
dc.subject.otherMarangoni flowen
dc.subject.othernatural convectionen
dc.subject.otheraluminiumen
dc.titleNumerical assessment and experimental verification of the influence of the Hartmann effect in laser beam welding processes by steady magnetic fieldsen
dc.typeArticleen
dc.type.versionacceptedVersionen
dcterms.bibliographicCitation.doi10.1016/j.ijthermalsci.2015.10.030en
dcterms.bibliographicCitation.journaltitleInternational Journal of Thermal Sciencesen
dcterms.bibliographicCitation.originalpublishernameElsevieren
dcterms.bibliographicCitation.originalpublisherplaceAmsterdam [u.a.]en
dcterms.bibliographicCitation.pageend34en
dcterms.bibliographicCitation.pagestart24en
dcterms.bibliographicCitation.volume101en
tub.accessrights.dnbfreeen
tub.affiliationFak. 5 Verkehrs- und Maschinensysteme::Inst. Werkzeugmaschinen und Fabrikbetrieb::FG Fügetechnikde
tub.affiliation.facultyFak. 5 Verkehrs- und Maschinensystemede
tub.affiliation.groupFG Fügetechnikde
tub.affiliation.instituteInst. Werkzeugmaschinen und Fabrikbetriebde
tub.publisher.universityorinstitutionTechnische Universität Berlinen

Files

Original bundle
Now showing 1 - 1 of 1
Loading…
Thumbnail Image
Name:
bachmann_etal_2016.pdf
Size:
14.31 MB
Format:
Adobe Portable Document Format
Description:
Accepted manuscript
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
5.75 KB
Format:
Item-specific license agreed upon to submission
Description:

Collections