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Local flashing events at the keyhole front in laser welding
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0002-3569-6795
2015 (English)In: Optics and lasers in engineering, ISSN 0143-8166, E-ISSN 1873-0302, Vol. 68, p. 35-41Article in journal (Refereed) Published
Abstract [en]

For sufficiently high power density, high power lasers induce a vertical boiling front that enables keyhole welding. Waves streaming down the keyhole front were recently observed by ultra-high speed imaging. Although the wave flow appears continuous, deeper analysis has revealed that it is composed of flashing events. The evaluation of eleven events for five parameter cases confirms a strong modulation of the recorded grayscale of bright peaks, achieving up to 50% higher brightness. The flash can even end 50% darker than initially, probably in the shadow of the laser beam. The flashing events took place every 5-15 µs, lasted for typically 10–70 µs and moved at a speed of 10–15 m/s. The flashing events are of fundamental significance to understand the keyhole front. They are associated with temperature peaks and with temporary local boiling action, accompanied by ablation pressure that accelerates the melt.

Place, publisher, year, edition, pages
2015. Vol. 68, p. 35-41
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-4661DOI: 10.1016/j.optlaseng.2014.12.019ISI: 000350839700005Scopus ID: 2-s2.0-84920723231Local ID: 2a3e355a-c7b1-4f9b-b122-0be5cb751a69OAI: oai:DiVA.org:ltu-4661DiVA, id: diva2:977535
Note
Validerad; 2015; Nivå 2; 20150109 (andbra)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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