Miller Maxstar 400 DC TIG Welder

This Maxstar 400 ships on a cart with a single cylinder rack, a foot pedal holder, three cable or torch holders, and two TIG electrode filler holders, giving it a mobile base for shop use. It is a DC TIG and stick inverter rated to weld material up to 5/8 in thick.

Power and duty cycle

Output is rated at 60% duty cycle at 300A for stick and TIG alike, and the machine accepts anywhere from 208 up to 575 volts without manual relinking. At 135 lbs it suits a fixed or semi-fixed station rather than constant carrying between jobs.

Features for precise arcs

A 120-volt auxiliary receptacle powers a cooling system or small tools without a separate cord. Nine program memories store favorite settings, and meter calibration supports certification needs. On TIG, pulse frequency can run up to 5,000 cycles every second, adding stability on thin material; on stick, arc characteristics adjust through DIG control, with an adaptive hot start that helps keep electrodes like 6010 from sticking at the arc start.

Does the cart include a foot pedal? It has a mounting holder for one; confirm with us whether an actual pedal ships with this listing.

What voltages does it accept? It covers the 208-to-575-volt window on either single or three-phase service.

Can it weld thinner material too? Yes, the amperage and pulse controls scale down for lighter work as well as the rated 5/8 in capacity.

Specifications