Welder Red Seal · Question
When selecting a tungsten electrode for DCEN GTAW on carbon steel, which of the following is most appropriate to ensure good arc starting and electrode life?
For DCEN (Direct Current Electrode Negative) welding on carbon steel, 2% thoriated tungsten is commonly used due to its excellent arc starting characteristics,
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Question: When selecting a tungsten electrode for DCEN GTAW on carbon steel, which of the following is most appropriate to ensure good arc starting and electrode life?
Answer options:
- Pure tungsten (green) with a balled tip. ✅ 2% Thoriated tungsten (red) with a sharply ground point.
- Zirconiated tungsten (brown) with a rounded tip.
- Ceriated tungsten (orange) with a flat end.
Correct answer: 2% Thoriated tungsten (red) with a sharply ground point.
Explanation: For DCEN (Direct Current Electrode Negative) welding on carbon steel, 2% thoriated tungsten is commonly used due to its excellent arc starting characteristics, high current carrying capacity, and long life. It should be ground to a sharp point or a truncated cone to concentrate the arc and provide good penetration.
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