2017 Everlast PowerTIG 255 EXT Digital Ac Dc Tig Stick Pulse Welder Dual Voltage Inverter-based Ac Dc Heavy-Duty IGBT Power Modules increase reliability and performance True low amp operation down to 3 amps DC and 5 amp AC AC Wave Forms: Advanced Square /Soft Square / Triangular / Sine Simplified menu design allows settings to be quickly selected and adjusted 10Hz Advanced AC Pulse mode improves penetration on thicker metals, and can reduce warping and burn through on thinner metals