Internal or external orifice through which powder is injected into flame or plasma. The time interval between start of shielding gas flow and arc or gas ignition. The heat applied to the base metal or substrate immediately before spraying. A specified temperature that the substrate is required to attain immediately before material deposition. The detailed elements of a process or method used to produce a specific result.
Examples are inert gases, combusted fuel gases, hydrogen and vacuum.
Curtains or portable fireproof canvas shields, sometimes required to enclose work areas, when there is a possibility of the spray stream being misdirected, or where the glare of the arc or flame could injure unprotected eyes. Leather or metal coated articles designed to prevent burns from ultraviolet radiation or misdirected particles.