Flame Spray Gun Flame Spray Gun is the thermal spraying of a group of coating processes in which finely divided metallic or nonmetallic materials are deposited in a molten condition to form a coating. This simplest device was based on the principle that if a wire rod were fed into an intense, concentrated flame, (the burning of a fuel gas with oxygen), it would melt. If the flame was surrounded by a stream of compressed gas, the molten metal would become atomized and readily propelled onto a surface to create a coating. Flame spray gun process variation in which the controlled explosion of a mixture of fuel gas, oxygen, and the powdered coating material is utilized. it melts and propels the material to the workpiece. Flame Spray Gun Process Flame spray gun spraying is the oldest of the thermal spraying processes, characterized by low capital investment, high efficiency, deposition rates, relative ease of operation and cost of ...