Commonwealth Scientific and Industrial Research Organisation

Siddons Ramset Limited

Subramania Ramakrishnan

Ashley Grant Doolette

Maciej Wlodzimierz Rogozinski

Nicholas A Sanders

Richard W Couch, Jr

Ian Michael Ogilvy

Alan Edward Mundy

Trevor Neil Kearney

Frederick Bedrich Polivka

Walter T Oppenlander

Maya Gershenzon

Walter T Oppenlander, Deceased

A process and apparatus for cutting a material using a plasma are jet provides improved uniformity along the length of cut, despite variations in cutting speed. This is achieved by pulsing the arc current and dynamically varying the pulsing. By this means the momentum of the plasma arc jet can be maintained substantially constant whilst the amount of energy delivered by the plasma arc jet is controllably varied. The pulsing can be dynamically varied in dependence on one or more of the cutting speed, the angle of ejection of a stream of molten material from the cut, the size of the droplets of the ejected material, the intensity of spectral pattern of light emitted from the plasma arc jet and material interface, and the arc voltage. The pulses can be varied by varying one or more of the pulsing frequency, the pulse duty, upper value of the pulse current, and depth of the pulses.

Controlled plasma arc cutting

Detecting non-symmetrical nozzle wear in a plasma arc torch

Plasma torch condition monitoring

Electric arc reactor having upstream and downstream electrodes

Electric arc generating device having three electrodes

Growing community of inventors

Glen Waverly, Australia

Subramania Ramakrishnan