When welding aluminum with GTAW, why is AC current typically used and what is the role of balance control?

• A. AC helps break up and remove the native aluminum oxide, and balance controls the time spent in cleaning (positive) vs penetration (negative).
• B. DCEN is used because aluminum conducts better with negative polarity.
• C. Shielding gas replaces the need for current type.
• D. Balance control is not important.

Answer: (A)