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Arc Spray Gun  (vote(s): 1) In the Arcspray process, the raw material in the form of a pair of metallic wires is melted by means of an electric arc. The molten material is atomised by compressed air and propelled towards the workpiece Flame Spray Gun  (vote(s): 1) In the Flamespray process, the raw material in the form of a single wire, cord or powder, is melted in an oxygen-fuel gas flame. This molten material is atomised by a cone of compressed air and propelled towards the workpiece. Powder Spray Gun POWDERJET GUN is a thermal spraying gun to deposit metals, ceramics or cermets available in powder form on to solid work surfaces. The powder to be sprayed is fed by gravity through a metering valve and is drawn at a reduced pressure into an aspirator chamber. The powder is then propelled through an oxy-acetylene flame. The flame melts the powder and propels the fine molten metal particles towards the work surface to be deposited there in the form of a coating. The gun has several merits. As only a minute amount of the powder is lost by being blown away or consumed in the flame, the deposit efficiencies are very high, nearly 100% in some cases. Sprayed coatings are dense and uniform. The gun can be operated both manually as well as held in a tool post for large volume automatic production. The design of the gun is such that it can spray a wide variety of powders without changing nozzle. The gun will perform efficiently and economically for a long time if the simple instructions regarding the operation and maintenance are followed