Argon and helium are classified as what type of gases?

Argon and helium are classified as inert gases, which means they possess very low chemical reactivity under standard conditions. This property is crucial in welding processes, such as Gas Tungsten Arc Welding (GTAW), where these gases are used to create a protective atmosphere around the weld pool. Their inertness prevents reactions with the materials being welded, thus helping to produce high-quality welds with minimal contamination.

Unlike reactive gases, which can easily engage in chemical reactions, inert gases maintain stable conditions essential for effective welding. Additionally, while argon is often categorized within the group of noble gases, the term "inert gases" is more commonly used in the context of welding, aligning properly with the intent of the question.