Everlast PowerArc 280STH Digital TIG Stick Pulse Welder, Green IGBT Power Modules from Infineon, Digital Microprocessor control from Infineon 35% duty cycle, Top performer with E6010 and 7018 250A DC Stick/280A DC TIG, DC TIG with pulse up to 250 Hz VRD function for improved safety while welding with Stick process 1 and 3 phase input capable