The process uses one of several welding gases for fuel: 1. Acetylene 2. Propane 3. Propylene Wire or powder is injected into the flame, where it melts and is sprayed onto the work. Equipment. . The plasma spray process was developed to spray ceramics, although plastics and metals can be treated. The process can be automated and requires fewer steps than other spray welding processes. The plasma spray welding process has the greatest amount of versatility.. . The Arc Spray process uses DC power to energize negative and positive wires, which are fed through a gun head. The wires arc against each other in the head, creating the heat necessary to create molten metal. Air that is compressed is introduced into the arc, atomizing the molten.
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