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Unbounded keyhole collapse and bubble formation during pulsed laser interaction with liquid zinc
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0002-3569-6795
Osaka University.
Osaka University.
Osaka University.
2002 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 35, no 11, p. 1218-1228Article in journal (Refereed) Published
Abstract [en]

Suppression of pore defects in keyhole laser spot welding demands for a theoretical description of the fundamental process. Investigating the unbounded keyhole collapse in liquid Zn instead of a solid provided a simplified situation offering several advantages. Improved high speed x-ray transmission imaging due to an enlarged keyhole in the absence of violent melt motion was enabled, which also facilitated the development of a semi-analytical mathematical model. Good correspondence between the experimentally and theoretically obtained transient keyhole and bubble shape permitted physical analysis by the model. Characteristic timescales were identified for post-vaporization, vapour relaxation, cooling, collapse, bubble contraction, oscillations and buoyancy. Recondensation due to rapid cooling turns out to be responsible for shielding gas flow into the keyhole, finally maintaining a spherical bubble. Creation of a convergent keyhole is a possibility to avoid bubbles.

Place, publisher, year, edition, pages
2002. Vol. 35, no 11, p. 1218-1228
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-8992DOI: 10.1088/0022-3727/35/11/319ISI: 000176528900023Scopus ID: 2-s2.0-0037035996Local ID: 78c733b0-c273-11db-9ea3-000ea68e967bOAI: oai:DiVA.org:ltu-8992DiVA, id: diva2:981930
Note
Validerad; 2002; 20070222 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Kaplan, Alexander

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