what gas does a tig welder use
Shielding gases for TIG/GTAW welding. The normal gas for TIG welding is argon (Ar). Helium (He) can be added to increase penetration and fluidity of the weld pool.Argon or argon/helium mixtures can be used for welding all grades. In some cases nitrogen (N 2) and/or hydrogen (H 2) can be added in order to achieve special properties.hielding gases for TIG/GTAW welding. The normal gas for TIG welding is argon (Ar). Helium (He) can be added to increase penetration and fluidity of the weld pool.