TIG Welding

Air Products offers a full range of standard shielding gas mixtures for MIG/MAG welding for all common material types.

The shielding gases protect the weld area from atmospheric gases, such as oxygen, nitrogen, carbon dioxide, and water vapour. Depending on the materials being welded, these atmospheric gases can reduce the quality of the weld or make the welding process more difficult to use.

When TIG welding (tungsten inert gas), the weldpool, the hot tungsten electrode and the molten end of the filler metal are protected from the atmosphere by an envelope of inert gas. Argon is generally used, although there are quality and productivity advantages in using a mixture of either argon and helium or argon and hydrogen.

TIG welding is a high-quality welding technique with a low fusion rate. The arc burns between a tungsten electrode and the work piece; the electrode does not melt, so it acts only as a current conductor and arc carrier.

For thin sheet metal work, TIG welding can be used without a filler metal. For thicker items or when joining different materials, a filler metal is used in the form of a handheld rod or a wire supplied by a separate feed device, generally current less. In standard TIG welding the arc is free, but a variant known as plasma welding uses a secondary nozzle to constrict the arc.

Our standard gases are available in traditional cylinder sizes at 200 bar and 300 bar cylinder pressure.