Which gas is often added to welding procedures to improve arc stability?

Argon is frequently utilized in welding procedures, particularly in gas metal arc welding (GMAW) and gas tungsten arc welding (GTAW), to enhance arc stability. As an inert gas, argon effectively shields the weld pool from atmospheric contamination, which can lead to defects in the weld. Its ability to ionize under electrical conditions also contributes to a more stable arc, allowing for better control over the welding process. This stability is crucial for achieving high-quality welds, especially in materials that are sensitive to oxidation or require precise thermal input. While helium is another inert gas that can be used for similar purposes, it is less common than argon for improving arc stability in many welding applications. Oxygen and acetylene, being reactive gases, are more associated with cutting or altering the properties of the weld pool rather than enhancing arc stability.