Which gas is commonly used as a shielding gas in GTAW?

Argon is commonly used as a shielding gas in Gas Tungsten Arc Welding (GTAW) because of its inert properties, which help create a stable and clean welding environment. This is crucial for producing high-quality welds without contamination from atmospheric gases. Argon provides excellent arc stability and makes it easier to control the welding process, especially with thin materials. Though helium is also used in some GTAW applications, argon is typically preferred due to its lower cost and effective shielding capabilities for a wide range of metals and thicknesses. Using oxygen or carbon dioxide is not suitable in this welding process, as these gases can react with the molten metal, causing defects and compromising the integrity of the weld.