Abstract: The plasma gun assembly of the invention is particularly suitable for coating the inner surfaces of narrow cavities, bores, channels or the like. It essentially comprises a plasma gun head member, a plasma gun shaft member and a connector member. These three units are designed as replaceable modules which can be replaced by the operator of the plasma gun assembly quickly and easily. The plasma gun head member is connected to the plasma gun shaft member by means of only two screws, and the connector member is connected to the plasma gun shaft member by means of only three screws. All channels, conductors and conduits for supplying the media and the electric energy required for the operation of the plasma gun assembly are running in the interior of the plasma gun shaft assembly.

Abstract: A thermal spray gun having an advanced, streamlined design which simplifies assembly of the gun components and reduces maintenance downtime. The thermal spray gun has a fuel/oxidant gas nozzle with a plurality of oxygen outlets arranged in a ring upon a discharge face. Three alternative fuel gas outlet configurations provide a combustion flame within a barrel having an inlet adjacent the fuel/oxidant gas nozzle discharge face. Powdered feedstock is supplied through a centrally disposed feedstock injector and is heated by the combustion flame. Oxidant gas, fuel gas and power feedstock are simultaneously discharged into the barrel, through a single plane perpendicular to the direction of gas and feedstock flow.