Which tungsten electrode alloy is commonly used in GTAW?

The use of 2% thoriated tungsten electrodes in Gas Tungsten Arc Welding (GTAW) is prominent due to their excellent performance characteristics. Thoriated tungsten is well-regarded for its ability to provide a stable arc and good electron emission properties, which are essential when working with a variety of metals, including stainless steel, aluminum, and others. The addition of thorium oxide enhances the electrode's efficiency in generating a smooth and consistent arc, which facilitates better control during the welding process.

Thoriated tungsten electrodes can withstand high temperatures, making them effective for demanding welding applications and allowing them to maintain their shape while sustaining frequent use. These properties make them a go-to choice among welders, particularly in critical applications requiring precision and reliability.

The other alloy options, while they also possess unique advantages, may not compare directly to the overall balance of arc stability and durability offered by thoriated tungsten in a wide range of welding scenarios.