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Unbounded keyhole collapse and bubble formation during pulsed laser interaction with liquid zinc
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling.ORCID-id: 0000-0002-3569-6795
Osaka University.
Osaka University.
Osaka University.
2002 (engelsk)Inngår i: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 35, nr 11, s. 1218-1228Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2002. Vol. 35, nr 11, s. 1218-1228
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URN: urn:nbn:se:ltu:diva-8992DOI: 10.1088/0022-3727/35/11/319ISI: 000176528900023Scopus ID: 2-s2.0-0037035996Lokal ID: 78c733b0-c273-11db-9ea3-000ea68e967bOAI: oai:DiVA.org:ltu-8992DiVA, id: diva2:981930
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Validerad; 2002; 20070222 (cira)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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