Orifice Gas
A gas directed into the torch to surround the electrode, which becomes ionized by the arc to form a plasma and issues from the torch nozzle as a plasma jet. (Also referred to as plasma gas or cutting gas).
Related Links
Theory Gas Orifice Meter
Natural Gas Flow Meter Types | Orifice Plate Differential Pressure
Small Bore Orifice for Gas Flow Calculation
Orifice plate
Orifice gas meters – PetroWiki
Related Videos

Drilling a gas orifice

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Dryer Liquid Propane Gas Orifice (part #383EEL3002A) - How To Replace
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Drilling a gas orifice
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Drilling the gas orifice from propane to natural gas
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Dryer Liquid Propane Gas Orifice (part #383EEL3002A) - How To Replace