What can GMAW be shielded with as a single gas?

Gas Metal Arc Welding (GMAW), also known as MIG (Metal Inert Gas) welding, can indeed be shielded with various gases, but the question specifies what can be used as a single gas. Carbon dioxide serves as a practical option for shielding in GMAW.

When using carbon dioxide, it provides effective shielding and is typically used in a variety of welding applications due to its ability to improve penetration and provide good arc stability. It is a cost-effective alternative that enhances the performance of the weld, especially in short-circuiting and spray transfer modes.

While argon and helium are commonly employed in GMAW for shielding, they are often used in combination with other gases for optimal results. Argon can be paired with small percentages of carbon dioxide to improve arc stability, especially in different welding positions, while helium may be used to increase the heat input and penetration in specific applications; however, it's less common as a standalone shield gas in traditional GMAW processes. Oxygen, on the other hand, is not used as a shielding gas in GMAW due to the risk of producing undesirable effects, such as oxidation, and compromising the integrity of the weld.

Thus, carbon dioxide stands out as the single gas that can