All of the major applications of Argon are related to the production, processing and fabrication of metals. The role of Argon is nearly always to exclude atmospheric air from contact with metal alloys. An example of this is as a purging gas to protect weld areas, such as the inside of pipes during welding.

The predominant gas used in shielding gases because it forms a very good shield due to the high density and total inertness.

Used on a wide range of ferrous and non-ferrous materials for welding and cutting.

Shielding gas for MIG and TIG welding processes and for plasma-cutting. Argon is used alone or mixed with other gases such as Helium, Carbon Dioxide, Oxygen, Nitrogen or Hydrogen. Each mixture is often specific to welding a particular material or to a particular process. For example, Argon is used as a shielding gas for TIG-welding aluminium, titanium and copper.​

When MIG-welding ferrous materials, pure Argon is not an ideal shielding gas, as it produces an arc with poor cathodic rooting characteristics, large droplet size and therefore higher levels of spatter. For this reason, BOC recommends that Argoshield or Stainshield gases be used depending on the thickness and type of material being welded.

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