The tungsten electrode in GTAW is described as non-consumable, though it slowly degrades.

• A. Consumable
• B. Non-consumable, though it slowly degrades
• C. Non-consumable and never degrades
• D. Consumable but easily replaced

Answer: (B)

In GTAW, the tungsten electrode acts as a non-consumable current carrier that shapes and maintains the arc. Tungsten’s very high melting point means it won’t melt into the weld like a filler rod would, so it isn’t consumed during welding. Yet the arc’s heat and wear gradually erode the tip and can cause surface oxidation, so the electrode slowly degrades over time. That combination—non-consumable behavior with gradual wear—is why the description “non-consumable, though it slowly degrades” is the accurate characterization. A note: you’ll typically dress or sharpen the tip as needed to keep the arc precise and prevent contamination from worn tungsten.