Electrodes for Gas- and Liquid-Cooled Plasma Torches

A method for conducting gas in a gas-cooled plasma torch, wherein the plasma torch h as a plasma torch body which holds an electrode with an open end and a closed end, wherein a cavity extends from the open end in the direction of the closed end, and which, with a spacing in an axial direction, holds a nozzle by means of a nozzle holder, wherein the nozzle has a central opening with an upstream inlet end, into which the electrode projects, and with an outlet end with a nozzle bore and is surrounded by a nozzle cap and/or a nozzle protection cap, wherein the plasma torch body has an opening for a gas feeder, which opening is fluidically connected to a cooling tube which projects into the open end of the electrode, wherein the method comprises:

• conducting a total gas stream through the opening of the gas feeder;
• conducting the total gas stream through the cooling tube into the electrode in the direction of the closed end of the electrode;
• conducting the total gas stream out of the electrode via an annular gap between the cooling tube and the electrode either only via a gas channel in the plasma torch body, which gas channel is fluidically connected to the annular gap via the open end of the electrode, or additionally via at least one opening in the wall of the electrode;
• and
• conducting the first partial gas stream of the total gas stream through the first space formed between the electrode and the nozzle and through the nozzle bore, conducting a second partial gas stream of the total gas stream through a second space formed by the nozzle and the nozzle cap and/or through a space formed by the nozzle cap and the nozzle protection cap or through a second space formed by the nozzle and the nozzle protection cap and possibly also outward through one or more openings in the nozzle protection cap, and conducting a third partial gas stream of the total gas stream through a third space formed between the electrode and a gas-conducting unit and through one or more openings in the gas-conducting unit to the outer side of the plasma torch.