Abstract: A projection device for depositing by projection a fused coating material onto a substrate. The projection device includes a projection nozzle having a central part defining a central passage for the coating material to be fused and projected. The central passage opening at a distal end thereof into a central orifice. The central part being fitted in a peripheral part. Ejection openings of ducts of oxycombustible mixture being distributed around the central orifice according to at least two series which are alternatingly offset from one another with respect to a main axis of the nozzle. The ducts include channels which are milled in the periphery of the central part. The carrier gas contains between 1 and 10% oxygen with the remaining portion consisting of nitrogen. The carrier gas being supplied by a unit for the separation of inert gas from air by adsorption or permeation. The projection device is particularly suited for the formation of the anti-corrosive deposits based on zinc.

Abstract: The process consists in providing at the outlet of a cutting nozzle, a central jet of cutting liquid and, simultaneously, a concentric jet of gas around the central jet of liquid, the jet of gas having a higher speed than that of the liquid jet. Typically, the liquid and the gas have the same composition, preferably oxygen. A device for carrying out the process is also disclosed.

Abstract: The present invention concerns a cutting head made of a cutting nozzle (2) with cutting oxygen duct (6) having radial ribs (11), the assembly being force fitted in a sheath (3) thus forming ducts of oxycombustible mixture (32). This nozzle which produces an improved heat dissipation can be made of reduced dimensions.

Abstract: The invention concerns a cutting torch for iron and steel metallurgy which is provided with two oxygen cutting ducts, ending in two housings, for receiving two cutting inserts, or a heating nozzle and a cutting insert. In this manner, there is obtained a torch which may very rapidly be converted into a cutting torch with high heating capacity and single cutting jet, or into a cutting torch with high cutting speed provided with two cutting inserts.

Abstract: An oxygen cutting device comprising two cutting oxygen jets conducted through passageways with a passageway therebetween for a carburizing flame ensuring a reheating at depth of the rough-cut kerf which is effected by the first cutting oxygen jet and is finished by the second cutting oxygen jet.

Abstract: The nozzle comprises an oxidizing outer heating ring and a carburizing inner heating ring surrounding the cutting jet. This nozzle is made in two parts respectively forming a unit (1) opf injectors and a cutting unit (2) in adjoining relation to each other in a transverse joint plane and in which are provided various passageways (4, 5). Grooves (7) are provided for putting the outer passageways (5) in communication with the inner passageways (4) so as to supply to the inner passageways (4) the required small quantity of oxygen for the inner heating ring from the oxy-fuel mixture supplied to the outer passageways (5).

Abstract: A high frequency-high voltage generator supplies current, on one hand, to a first arc striking circuit connecting a main electrode to an auxiliary electrode and, on the other hand, to a second arc striking circuit which connects one of the two electrodes to the workpiece to be treated. In this way there is achieved a striking of the arc in two stages. This ensures high reliability regardless of the nature of the material from which the workpiece is made regardless of the protecting gas used, in particular for the TIG welding of light alloys in a helium atmosphere. The device is applicable to an automatic TIG welding.