What inert gases are commonly used in Metal Arc Gas Shielded Welding?

In Metal Arc Gas Shielded Welding, inert gases create a protective environment around the weld area, which helps to prevent contamination and oxidation during the welding process. Argon and helium are the most commonly used inert gases for this technique due to their excellent shielding properties and their ability to stabilize the arc. Argon is preferred because it is cost-effective and provides good arc stability, while helium can be used to increase heat input and enhance penetration, particularly suitable for thicker materials.

Nitrogen and carbon dioxide can also be part of the shielding gas mixture, although they are not inert. Nitrogen can sometimes be used to enhance the purity of certain welds, while carbon dioxide can improve the welding process by stabilizing the arc and increasing metal transfer efficiency in specific applications. Hence, the inclusion of argon, nitrogen, carbon dioxide, and helium broadens the applications and effectiveness of shielding gases in Metal Arc Gas Shielded Welding, making this answer the most comprehensive choice reflecting the diverse options available for welders.