Welder Red Seal · Question
Which type of tungsten electrode is generally preferred for GTAW on aluminum using alternating current (AC)?
Pure tungsten (green tip) is traditionally preferred for AC GTAW on aluminum because it forms a clean, stable ball end under AC current due to its lower melting
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Question: Which type of tungsten electrode is generally preferred for GTAW on aluminum using alternating current (AC)?
Answer options:
- 2% Thoriated (red tip) ✅ Pure Tungsten (green tip)
- 2% Lanthanated (blue tip)
- 0.8% Zirconiated (brown tip)
Correct answer: Pure Tungsten (green tip)
Explanation: Pure tungsten (green tip) is traditionally preferred for AC GTAW on aluminum because it forms a clean, stable ball end under AC current due to its lower melting point, which provides good arc stability and cleaning action. While zirconiated tungsten can also be used for AC, pure tungsten is a classic and effective choice for this application.
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