Welder Red Seal · Question
In the GTAW process, what does the red colour band on a tungsten electrode signify?
The industry standard colour code identifies 2% Thoriated tungsten (EWTh-2) with a red band. This type was historically common for DC welding of steels due to i
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Question: In the GTAW process, what does the red colour band on a tungsten electrode signify?
Answer options:
- Pure tungsten (EWP) ✅ 2% Thoriated tungsten (EWTh-2)
- 2% Ceriated tungsten (EWCe-2)
- 1.5% Lanthanated tungsten (EWLa-1.5)
Correct answer: 2% Thoriated tungsten (EWTh-2)
Explanation: The industry standard colour code identifies 2% Thoriated tungsten (EWTh-2) with a red band. This type was historically common for DC welding of steels due to its good arc starting and stability, but is now often replaced by other types due to its radioactivity.
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