What are the two main types of tungsten electrodes used in GTAW?

The two main types of tungsten electrodes used in Gas Tungsten Arc Welding (GTAW) are pure tungsten and alloyed tungsten.

Pure tungsten electrodes are comprised entirely of tungsten, making them suitable for welding non-alloyed and low-alloy steels, as well as for applications that require high heat resistance. They offer excellent arc stability and are typically identified by their green color band.

Alloyed tungsten electrodes contain additives, such as thorium, lanthanum, or cerium, which enhance specific properties like electron emission, arc stability, and the electrode's performance at higher temperatures. These alloys improve the overall efficiency and reliability of the welding process, especially when working with more challenging materials or when precise control of the arc is essential.

The understanding of these two types helps in selecting the appropriate tungsten electrode for specific welding applications, which is critical for achieving high-quality welds.