The Lincoln tig welder Precision TIG 275 Description: Patented Micro-Start II Technology - Delivers extremely stable low amperage starting, welding and cratering for both AC and DC welding; AC Auto Balance - Automatically sets the optimal cleaning vs. penetration levels for great looking aluminum welds; High duty cycles - 275 amps at 40% duty cycle; Widest output range in its class - 2-340 amps for both AC and DC; Add an optional Under-Cooler Cart - For extra storage and water-cooled applications.