Miller Syncrowave 400 Ac/Dc TIG and Stick Welder (907783)

This is the top end of the Syncrowave TIG line at 400 amps, sold here as a bare power source rather than a turnkey station — the choice for a shop with its own cables, torches, or cooling cart already on hand.

What makes the 400 different from smaller Syncrowaves

At this amperage, the machine is rated into thicker material: up to 1/2-inch steel or 3/8-inch aluminum, running off single- or three-phase 208/240/480V power with no manual voltage-linking step. Pulsed TIG and DIG control adjust to a wider span of electrodes and base metals at this output level than a lower-amperage inverter would allow.

What ships, and what does not

Two Dinse connectors, an 8-foot cord with no plug attached, and an owner's manual come with the power source itself; a torch, work leads, and any cooling cart are left for the buyer to supply or order as separate packages. An Arc Timer and Cycle Counter log welding time on the display, handy for pricing jobs after the fact.

Common questions

Does squarewave AC output still apply at this amperage? Yes, the same adjustable-balance AC cleaning action for aluminum carries through the whole Syncrowave line.

Miller backs this unit with a 3-year warranty. One note on this listing: a spec row showing a lower amperage and duty-cycle figure appears to be carried over from a smaller Syncrowave model rather than describing this 400-amp unit, so rely on the name and the amperage range above instead.

Specifications