Welder Red Seal · Question
For GTAW on aluminum alloys, what type of current is traditionally used to provide a 'cleaning action' that removes the surface oxide layer?
Alternating Current (AC) is used for welding aluminum. The electrode positive portion of the AC cycle provides a cathodic cleaning action, breaking up the refra
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Question: For GTAW on aluminum alloys, what type of current is traditionally used to provide a 'cleaning action' that removes the surface oxide layer?
Answer options:
- Direct Current Electrode Negative (DCEN)
- Direct Current Electrode Positive (DCEP) ✅ Alternating Current (AC)
- Pulsed Direct Current (DC-P)
Correct answer: Alternating Current (AC)
Explanation: Alternating Current (AC) is used for welding aluminum. The electrode positive portion of the AC cycle provides a cathodic cleaning action, breaking up the refractory aluminum oxide layer, while the electrode negative portion provides heat for penetration.
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