Abstract: A plasma torch control system includes a data storage device that stores optimum arc voltages as a function of real torch powers supplied to the torch, wherein an optimum arc voltage is a voltage for which the torch has maximum torch efficiency for a real torch power, a ramping regulator that ramps the real torch power to a power reference value and keeps a real arc voltage of the torch within an error margin of an optimum arc voltage stored in the data storage device, and a stabilizing regulator that stabilizes the real torch power around the power reference value and keeps the real arc voltage within an error margin of an optimum arc voltage stored in the data storage device.

Abstract: The invention concerns a device for externally cooling a plasma torch. The invention concerns a device for cooling a plasma torch in which the electrode(s) and plasma fluid and cooling circuits are housed in a tubular casing, wherein the cooling device includes an independent sheath surrounding at least one main portion of the tubular casing and formed of two concentric casings, at least one cooling fluid inlet and at least one outlet disposed at the proximal extremity of the sheath, a system of baffles being disposed between the two casings of the sheath so as to constitute between the inlet and outlet a cooling circuit substantially covering the entire surface of the sheath, the inlet and outlet being connected to a suitable cooling fluid source.

Abstract: The present invention concerns a plasma torch with an approximately axi-symmetrical structure including a tubular bare torch portion having a single upstream electrode or a pair of coaxial upstream and downstream electrodes. The electrodes are tubular and cooled by a suitable cooling circuit. A field coil moves the arc foot. An injection mechanism injects a plasma gas downstream of the upstream electrode or between the upstream electrode and the downstream electrode. A starter mechanism ensures starting of the torch. An external structure integral with the bare torch at its proximal extremity includes fluid and electric linkings with the outside of the torch. The bare torch includes a bearer structure formed of three coaxial casings overlapping, at least partially, and integral with the external structure.