Lincoln Electric Aspect 375 AC/DC TIG Welder Ready-Pak K3946-2 Effortless arc control for the smoothest welds AC Auto-Balance makes it simple by automatically providing the optimal mix of cleaning and penetration on aluminum Intellistart Technology provides soft starts on thin materials and hotter starts required on thicker materials Customization when you need it. - Manage AC frequency, balance and offset to modify arc profile, cleaning action or penetration