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Unbounded keyhole c...
Unbounded keyhole collapse and bubble formation during pulsed laser interaction with liquid zinc
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- Kaplan, Alexander (författare)
- Luleå tekniska universitet,Produkt- och produktionsutveckling
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- Mizutani, Masami (författare)
- Osaka University
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- Katayama, Sieji (författare)
- Osaka University
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- Matsunawa, Akira (författare)
- Osaka University
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(creator_code:org_t)
- 2002-05-23
- 2002
- Engelska.
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Ingår i: Journal of Physics D. - : IOP Publishing. - 0022-3727 .- 1361-6463. ; 35:11, s. 1218-1228
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)
Nyckelord
- Produktionsutveckling
- Manufacturing Systems Engineering
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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