Helium is used considerably in the welding industry as an inert shielding gas for arc welding. It is used both as a pure gas and in mixtures with Argon for TIG or MIG welding. On some applicatons, Helium has the advantage over Argon in gas-shielded arc welding because it provides greater arc heat for the same welding currents and arc length. This results in deeper penetration, which is preferable for welding heavier materials, when greater welding speed is required, or when metals of high thermal conductivity are to be welded.