TITLE

Analysis of the dynamics of transition from deep to shallow penetration CO2 laser welding

AUTHOR(S)
Govekar, Edvard; GradisĖ‡ek, Janez; Grabec, Igor; Geisel, Mark; Otto, Andreas; Geiger, Manfred
PUB. DATE
July 2002
SOURCE
AIP Conference Proceedings;2002, Vol. 622 Issue 1, p211
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
By varying the output power density of a CO[sub 2] laser beam either a deep penetration or a shallow penetration welding regime can be achieved. The transition between the two regimes is accompanied by abrupt changes in the statistical and dynamical characteristics of emitted light intensity. For a characterisation of the dynamics the coarse-grained entropy rate is applied. A high entropy rate is typical for deep penetration, while a low value is characteristic for a shallow penetration welding regime. Additionally, dynamics of the welding regimes are modelled by the Langevin equation. Analysis reveals that in both welding regimes the dynamics corresponds to stochastic fluctuations around a stable fixed point. It is demonstrated that a stable node corresponds to the deep penetration welding, while a stable spiral corresponds to the shallow penetration welding. The transition between welding regimes can be thus described by a change of the fixed point character.
ACCESSION #
6844493

 

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