Why is argon favored as a shielding gas in TIG welding?

Argon is favored as a shielding gas in TIG welding primarily due to its ability to provide high arc stability at low flow rates. This characteristic is crucial for TIG welding, as it allows for a consistent and controllable arc, which is essential for achieving high-quality welds. High arc stability minimizes the likelihood of arc disruptions, allowing the welder to maintain better control over the weld pool and produce cleaner, more precise welds.

While argon may not be the least expensive option available, its benefits in terms of arc stability and weld quality justify its use despite potential cost considerations. Additionally, while argon contributes to producing a cleaner weld by preventing contamination from atmospheric gases, the specific advantage of arc stability is what makes it particularly favored in TIG welding applications. Argon's non-reactive nature is also beneficial, but its capacity to maintain arc performance at lower flow rates is a key factor in its preference.

In high-temperature applications, other gases may be used, but that does not specifically define argon's role in the general context of TIG welding. Therefore, it is the stability offered by argon at low flow rates that solidifies its position as the preferred shielding gas in this welding process.