Why is GTAW AC Preferred for Aluminum Welding? 🔥 When it comes to aluminum welding, the right process makes all the difference in ensuring weld strength, quality, and reliability. That’s why Gas Tungsten Arc Welding (GTAW) with Alternating Current (AC) is the go-to method. 🌍 GTAW Current Modes: DCEN → Deep penetration, cooler tungsten. Best for steels & thicker sections. DCEP → Strong cleaning action, shallow penetration. Limited use (thin sheets). AC → Balance of cleaning (EP) penetration (EN