PLASMA ARC WORKING PROCESS AND INSTALLATION WITH GAS MIXTURE BASED ON HYDROGEN, NITROGEN AND / OR ARGON

摘要

Method and installation for arc work, in particular plasma cutting, of a work piece, in which a plasma torch is supplied with an electric current and with a gaseous mixture containing hydrogen and nitrogen and / or argon, a plasma jet is obtained by means of the plasma torch obtained by ionization of the gas mixture by electric current. The proportion of hydrogen in the gas mixture containing hydrogen and nitrogen and / or argon is less than 50%. The gas mixture is obtained by adding a determined quantity of hydrogen in nitrogen and / or argon, immediately before introduction of the gas mixture into said torch. The determined quantity of hydrogen is determined as a function of the thickness of the work piece, the shade of the material constituting the work piece, the desired working speed and / or the intensity of the electric current.