Is spraying a hot process?

No. Parts being sprayed do not generally rise above a temperature of 150°C. If the component being sprayed has a large mass, i.e. heat sink, then its temperature will remain much lower than this. However, special hardfacing sprayed coatings known as self-fluxing alloys are sprayed and then furnace heat treated at elevated temperatures to diffusion bond the coating to the substrate.

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