Abstract: A mechanical wiper mounted within an incinerator for waste gases, such as silane, and said wiper adapted to move adjacent selected internal surface areas to remove combustion products buildup on such selected areas.

Abstract: A tuyere is disclosed which is adapted for the injection of gases into a metallurgical vessel. The tuyere includes inner and outer concentric tubes having a radial separation therebetween which defines an annular gap. In use, one gas such as an oxygen mixture flows through the center of the inner tube, and a second normally inert gas flows through the annular gap between the two tubes. In order to provide a closely predetermined and predictable gas flow rate through the annular gap, annular groove is formed in the wall of the outer tube which forms an annular restriction in the gap, and the extent of the restriction may be calibrated so as to provide a closely predetermined gas flow rate therethrough when in use. An annular groove may also be formed in the wall of the inner tube to provide a predetermined restriction in the gas flowing through the inner tube.

Abstract: Apparatus for scarfing defects in a metal workpiece having an oxygen discharge nozzle terminating in a nozzle discharge orifice adapted to discharge a sheet-like stream of cutting oxygen of uniform intensity across the surface of a metal workpiece and means for admixing a gas with the oxygen to be discharged through the discharge orifice wherein at least one edge of the sheet-like stream of oxygen is of reduced privity insufficient to scarf a workpiece, while the remainder of the sheet-like stream is sufficient to scarf defects from a workpiece surface.

Abstract: A combination cutting torch and nozzle assembly for post-mix oxy-fuel gas cutting using two separate annular steams of preheat oxygen gas surrounding the fuel gas stream with the inner annular oxygen stream directed to impinge the fuel gas stream very close to the point of discharge from the nozzle assembly. The nozzle assembly is secured to the torch head of the cutting torch by a hollow retaining nut which forms an annular gap with the nozzle assembly for discharging the outer preheat oxygen gas stream.

Abstract: Scarfing apparatus for thermochemically treating a metal surface including a desurfacing head and an upper and lower block extending from the head in spaced apart relation to define a slot-like nozzle, output discharge means in at least one of the blocks for discharging a gas and a gas distribution assembly for distributing gas evenly across said output discharge means with the gas distribution assembly including an inlet supply chamber, a manifold discharge chamber which intersects the inlet supply chamber to form a ledge and a gas redistribution member supported upon said ledge for redirecting gas flow from said inlet supply chamber into said manifold discharge chamber.

Abstract: A process for thermochemically scarfing a metal workpiece comprising:Preheating a spot on the surface of the workpiece where the scarfing reaction is to begin by directing a post-mixed preheating flame at the spot. The preheating flame is formed by:(a) discharging at least one stream of preheat oxidizing gas and at least one stream of preheat fuel gas from separate ports in such a manner that the streams impinge external to their discharge ports, above the work surface and in such manner that the axes of the streams form an acute included angle between them, and(b) stabilizing said preheating flame by discharging a low-intensity stream of oxidizing gas. The stabilizing stream is directed in the same general direction as the direction of the flame or it may be directed such that the angle formed by the low intensity stream and the forward axis of the flame is from 10.degree. to 90.degree..

Abstract: An instantaneous scarfing cut on the surface of a metal workpiece can be made by:(a) causing relative motion between the workpiece and a stream of scarfing oxygen gas, and simultaneously therewith(1) impinging at least one laser beam on the work surface so as to produce a heated path of desired length across said surface relative to its direction of motion, said heated path being produced by the laser beam heating a series of points on said surface to their oxygen ignition temperature, and(2) impinging a stream of scarfing oxygen onto said heated path, thereby causing an instantaneous scarfing cut to begin along said path, and(b) continuing the flow of scarfing oxygen until the desired length of cut has been produced.