Plasma cutting (plasma arc cutting) is a melting process in which a jet of ionised gas at temperatures above 20,000°C is used to melt and expel material from the cut. ... This heat melts the metal and the gas flow ejects it from the cut. Plasma gases are usually argon, argon/hydrogen or nitrogen.
Plasma cutting is used for all sorts of metal fabrication projects and is typically used in on-site construction or salvage yards. For designers and artists, the most common uses are in both signage and sculpture, as well as being used in decorative panels for interior projects.