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Dynamics of ripple formation and melt flow in laser beam cutting



Journal of Physics. D. Applied Physics 32 (1999), Nr.11, S.1219-1228 : Ill., Lit.
ISSN: 0022-3727
Fraunhofer ILT ()
laser; Riefenbildung; Schmelzschneiden; Schmelzströmung

The dynamical behaviour of the laser beam fusion cutting process of metals is investigated. Integral methods such as the variational formulation are applied to the partial differential equations for the free boundary problem and a finite dimensional approximation of the dynamical system is obtained. The model describes the shape of the evolving cutting kerf and the melt flow. The analysis is aimed at revealing the characteristic features of the resultant cut, for example, ripple formation and adherent dross. The formation of the ripples in the upper part of the put, where no resolidified material is detectable, is discussed in detail. A comparison with numerical simulations and experiments is made.