Welder Red Seal · Question
Which type of current is most commonly used for welding aluminum with GTAW?
AC current is typically preferred for GTAW welding of aluminum because its alternating polarity provides a cleaning action (DCEP half-cycle) to remove the tenac
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Question: Which type of current is most commonly used for welding aluminum with GTAW?
Answer options: ✅ Alternating Current (AC)
- Direct Current Electrode Negative (DCEN)
- Direct Current Electrode Positive (DCEP)
- Pulsed Direct Current (PDC)
Correct answer: Alternating Current (AC)
Explanation: AC current is typically preferred for GTAW welding of aluminum because its alternating polarity provides a cleaning action (DCEP half-cycle) to remove the tenacious aluminum oxide layer, while also providing good penetration (DCEN half-cycle).
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