Flame spraying uses fuel gas acetylene, propane, methyl acetylene propadiene (MPS), hydrogen or natural gas, and combustion-supporting gas oxygen as the heat source. The sprayed material enters the flame through a certain transmission method and is heated to a molten or softened state. Then, rely on gas or flame to accelerate the jet to the substrate. According to the different spraying materials, it can be divided into wire flame spraying and powder flame spraying.
The wire is conveyed by the air turbine or motor in the spray gun, and its speed can be adjusted to control the wire feeding speed. The air-turbine spray gun is difficult to fine-tune the wire feeding speed, and its speed is affected by the compressed air and it is difficult to be constant. However, the spray gun is light in weight and suitable for manual operation; the electric motor is used to transfer the wire, although the wire feeding speed is easy The adjustment can also be kept constant, and the spraying has a high degree of automation, but the bulky spray gun is only suitable for mechanical spraying.
The wire flame spraying efficiency is high, but the sprayed droplet size is uneven, which makes the coating structure uneven, the porosity is also large, and the forming process of the wire drawing spray material is restricted.
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