A silver-copper cutting electrode assembly, and method of manufacture is provided with optimized attributes to allow for improved durability, integrity and manufacturability. An electrode has a silver tip portion which is brazed to a copper body portion where the silver portion and joint have a particular structural relationship.

In an aspect, a direct-current plasma torch apparatus is provided. The plasma torch apparatus includes first and second electrodes and an insulating body, where the electrodes are electrically connected to an external power source to generate an arc discharge between the first and second electrodes. The plasma torch apparatus can be configured as a modular torch apparatus for simple removal and replacement of elements of the plasma torch apparatus. The plasma torch apparatus can also be configured as a cooled plasma torch apparatus to prolong the working life of elements of the plasma torch apparatus.

A method of making and assembling together components of a plasma torch electrode inside an oxygen-free environment. According to one implementation the method includes machining an outer surface of an emitter to produce an oxide free outer surface and machining an opening in a distal end of a main body of the electrode, the opening being bound by an oxide-free inner surface of the main body after the machining. In the oxygen-free environment, the emitter is then secured inside the opening of the main body such that the oxide-free outer surface of the emitter is secured to the oxide-free inner surface of the main body.

The invention relates to a method for conducting gas in a gas-cooled plasma torch wherein the plasma torch has a plasma torch body which holds an electrode with an open end and a closed end. 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. 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. 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.

The invention relates to a wear part for an arc torch, plasma torch or plasma cutting torch, characterised in that the wear part or at least one part or a region of the wear part consists of an alloy formed from silver and zirconium, silver and hafnium, or silver and zirconium and hafnium.

The invention relates to gas conducting unit for a gas-cooled plasma cutting torch, wherein the gas-conducting unit is single-part or multi-part tubular or annular. The gas-conducting unit comprises a single-part or multi-part tubular or annular gas-conducting unit body with a longitudinal axis L1. In a wall of the gas-conducting unit body, there are situated at least one opening, which is inclined by an angle δ in a range of ± 15° with respect to the longitudinal axis L1, and at least one second opening, which is inclined radially with respect to the longitudinal axis L1 or which, in a radial plane, is inclined at an angle γ in the range of ± 30°from the radial to the longitudinal axis L1.

A thermal metal spraying apparatus for applying a metal coating to a target surface. The apparatus provides a cathode, a wire feed stock having a free end, and a wire guide that directs the free end of the wire feedstock to a position for establishing and maintaining a plasma transferred wire arc between the cathode and the free end of the wire feedstock. The wire guide maintains at least three points of contact with the wire feedstock as the wire feedstock is fed through the wire guide.

A method of assembling an electrode by securing together an emitter of the electrode inside an emitter holder while at the same time securing together the emitter holder inside a distal end of a tubular body of the electrode. According to one implementation the securing together includes simultaneously applying a proximally directed force to the emitter and a distally directed force to the emitter holder to cause a bulging of the emitter inside the emitter holder and a bulging of the emitter holder inside the distal end of the tubular body.

An electrode holder for an arc plasma torch includes an elongate holder body. The holder body includes a holder end for receiving an electrode and a hollow interior. An internal thread is positioned in the hollow interior for screwing in a rear end of said cooling tube. A cylindrical inner surface adjoins the internal thread for centering the cooling tube relative to the electrode holder.

Plasma electrode (1) for a plasma arc torch consisting of an electrode body, at least one electrode core (4) disposed on the electrode tip, wherein the plasma electrode (1) is constructed in at least two parts and consists of the electrode tip (2) and an electrode part (3), and out of the electrode tip (2) and a electrode part (3) consists, and that the electrode tip (2) is held replaceably on the electrode part (3).