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Progress in Plasma Processing of Materials, 2003

ISBN:
978-1-56700-192-1 (Print)
978-1-56700-447-2 (Online)

PLASMA CHARACTERISTICS IN A CUTTING PLASMA TORCH

P. Freton
Laboratoire Plasma et Conversion d'Energie, UMR UPS-INP-CNRS5213, Université Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse cedex 9, France

Alain Gleizes
Centre de Physique des Plasmas et de leurs Applications de Toulouse (CPAT) UMR n° 5002 − Université Paul Sabatier, 118 Route de Narbonne F31062 Toulouse Cedex 4 - France

J. J. Gonzalez
Laboratoire Plasma et Conversion d'Energie, UMR UPS-INP-CNRS5213, Université Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse cedex 9, France

M. Razafinimanana
Centre de Physique des Plasmas et de leurs Applications de Toulouse, UMR 5002, Universite Paul Sabatier, 118 route de Narbonne F31062, Tolouse cedex 4, France

Abstract

An experimental and theoretical study of a low current intensity cutting plasma torch is presented. The operating gas is oxygen discharging in an air environment. The plasma model is developed with the commercial code Fluent 4.5. Two configurations were used: One where the arc is transferred on a rotating anode 15 mm away and another one in a real cutting configuration (distance nozzle exit − workpiece around few mm). In the first configuration, spectroscopic measurements were made and compared with the model. In the second one, a power balance of the cutting process is presented above and in the thickness of the plate. The model shows that the power used for fusion comes mainly from the convective, conductive and radiation terms with a contribution between 50% and 70%. The electrical and oxidation contributions are also quantified.