Welder Red Seal · Question
When performing GTAW on aluminum using an older transformer-based machine without advanced square wave capabilities, which type of tungsten electrode is traditionally recommended?
Pure tungsten (green band) forms a balled end when used with AC, which is ideal for the stable arc required for welding aluminum on older transformer machines.
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Question: When performing GTAW on aluminum using an older transformer-based machine without advanced square wave capabilities, which type of tungsten electrode is traditionally recommended?
Answer options:
- 2% Thoriated (EWTh-2) ✅ Pure Tungsten (EWP)
- 2% Ceriated (EWCe-2)
- 1.5% Lanthanated (EWLa-1.5)
Correct answer: Pure Tungsten (EWP)
Explanation: Pure tungsten (green band) forms a balled end when used with AC, which is ideal for the stable arc required for welding aluminum on older transformer machines. Thoriated tungsten is not recommended for AC welding.
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