What are the common shielding gases used in GTAW?

In Gas Tungsten Arc Welding (GTAW), the most commonly used shielding gases are argon and helium. Argon is preferred for its inert nature, which helps stabilize the arc and provides excellent protection against contamination from atmospheric gases. It is suitable for welding a variety of metals, including aluminum and stainless steel.

Helium, on the other hand, can be used to increase heat input and improve penetration, especially when welding thicker materials. It is often used in combination with argon to enhance the properties of the shielding gas, providing a stable arc and effective shielding while enabling high-temperature welding.

Utilizing argon and helium together or individually in GTAW allows welders to achieve high-quality welds with less risk of defects, making them the go-to choices for shielding gases in this welding process.