Professional Electric 240 Volt Spot Welder Welding Systems Electrical Rating: 240V/16A Rated Output: 2.5kVA@50% Duty Cycle Weldable Materials: Uncoated mild, galvanized, or stainless sheet steel Mild steel: up to a combined thickness of 1/8" sheet steel Galvanized steel: two pieces of 20 gauge (0.039") sheet steel