Welder Red Seal · Question
When preparing a 3.2 mm diameter pure tungsten electrode for AC welding on aluminum, what shape should the tip ideally be for optimal performance?
For AC welding on aluminum with a pure tungsten electrode, the tip should form a clean, hemispherical ball. This shape allows for an even distribution of curren
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Question: When preparing a 3.2 mm diameter pure tungsten electrode for AC welding on aluminum, what shape should the tip ideally be for optimal performance?
Answer options:
- Sharply pointed with a 30-degree taper. ✅ Ball-shaped, approximately 1.5 times the electrode diameter.
- Blunt with a flat end.
- Conical with a truncated tip.
Correct answer: Ball-shaped, approximately 1.5 times the electrode diameter.
Explanation: For AC welding on aluminum with a pure tungsten electrode, the tip should form a clean, hemispherical ball. This shape allows for an even distribution of current, excellent arc stability, and effective cleaning action on the aluminum surface, contrary to the sharply pointed tip used for DC welding.
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