Is the tungsten electrode used in TIG welding a filler and/or consumed?

The tungsten electrode used in Tungsten Inert Gas (TIG) welding is indeed non-filler and non-consumable. In this welding process, the tungsten serves primarily as an electrode that provides the arc necessary for welding but does not melt away or become part of the weld itself. This is a key characteristic of TIG welding, where the filler material—typically in the form of a separate rod—is used separately to add material to the weld pool. Consequently, the tungsten electrode remains intact throughout the welding process, emphasizing its role as a non-consumable component. This helps ensure a stable arc and high-quality welds, as the electrode is designed to withstand the high temperatures produced during the welding operation without degrading.