Welder Red Seal · Question
A welder is preparing a 2.4 mm diameter pure tungsten electrode for welding aluminum with AC GTAW. What is the recommended tip preparation for this electrode?
For AC welding on aluminum with pure tungsten electrodes, the electrode tip naturally forms a balled end due to the current. Preparing it to a ball approximatel
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Question: A welder is preparing a 2.4 mm diameter pure tungsten electrode for welding aluminum with AC GTAW. What is the recommended tip preparation for this electrode?
Answer options:
- A sharp, pointed tip.
- A truncated cone tip. ✅ A balled tip approximately 1.5 times the electrode diameter.
- A flat, blunt tip.
Correct answer: A balled tip approximately 1.5 times the electrode diameter.
Explanation: For AC welding on aluminum with pure tungsten electrodes, the electrode tip naturally forms a balled end due to the current. Preparing it to a ball approximately 1.5 times its diameter before welding helps create a stable arc and prevents the tungsten from melting excessively during the process.
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