Welder Red Seal · Question
Which type of tungsten electrode is generally preferred for AC GTAW on aluminum alloys due to its good arc stability and resistance to contamination, offering a longer electrode lifespan compared to pure tungsten?
Zirconiated tungsten electrodes (brown tip) are specifically formulated for AC welding, offering excellent arc stability, higher current carrying capacity, and
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Question: Which type of tungsten electrode is generally preferred for AC GTAW on aluminum alloys due to its good arc stability and resistance to contamination, offering a longer electrode lifespan compared to pure tungsten?
Answer options:
- 2% Thoriated (red tip)
- 1.5% Lanthanated (gold tip)
- Pure Tungsten (green tip) ✅ 0.8% Zirconiated (brown tip)
Correct answer: 0.8% Zirconiated (brown tip)
Explanation: Zirconiated tungsten electrodes (brown tip) are specifically formulated for AC welding, offering excellent arc stability, higher current carrying capacity, and very good resistance to tungsten contamination for aluminum and magnesium alloys compared to pure tungsten.
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