The metal spray process is basically the spraying of molten metal onto a surface to provide a coating.
Material in wire form is melted in a flame (oxy-acetylene flame is the most common) and atomised using
compressed air to form a fine spray.
When the spray contacts the prepared surface of a substrate material, the fine molten droplets rapidly
solidify forming a coating. This flame spray process carried out correctly is called a "cold process"
(relative to the substrate material being coated) as the substrate temperature can be kept low during
processing avoiding damage, metallurgical changes and distortion to the substrate material.