Which gases are classified as inert gases for GTAW?

In GTAW, the classification of gases as inert is crucial for creating an optimal welding atmosphere. In this context, helium and argon are identified as inert gases, which means they do not react with the molten metal during the welding process. This inert gas environment helps to protect the weld pool from oxidation and contamination by atmospheric elements.

Helium has a higher thermal conductivity than argon, which can enhance heat input and increase the welding speed in certain applications. Argon, being the most commonly used shielding gas in GTAW, provides excellent stability and arc characteristics, making it an ideal choice for welding a variety of materials.

This understanding of inert gases is vital for welders as the proper selection can lead to improved weld quality and consistency. The other options include gases that can either react with materials being welded or are not commonly employed as shielding gases in GTAW, which is why they are not classified as inert in this context.