Tweco Arcmaster 401MST, 401S Welding Power Sources

December 2, 2014

Tweco ArcMaster 401MST (MIG-Stick-Lift TIG) and ArcMaster 401S (Stick-Lift TIG) power sources have a 10- to 400-amp output and work with cellulose 6010 electrodes and MIG and flux cored wires (401MST).

A case protects the units from a 3-foot drop and the units take up 50 percent less space than welders with similar outputs, the company says. They measure 16.5 inches x 8.3 inches x 17.7 inches. The ArcMaster 401MST weighs 54 pounds and the ArcMaster 401S weighs 46 pounds. Automatic primary voltage selection with no mechanical changeover enables the unit to operate off single- or three-phase power, 208-230/400/460 VAC.