The TIG AC/DC 401 Pulse is a powerful and intelligent welding machine. This unit is capable of either AC or DC TIG welding (stainless steel, mild steel or aluminum) or Stick welding. The TIG AC/DC 401 Pulse has advanced TIG welding parameters that allows user to fine-tune the TIG welding process to meet a variety of applications. This combination, with its high duty cycle and easy to use interface, make it the perfect choice for production TIG welders who demand the best all day, every day.