Almost ALL TIG welders. by default, are stick welders, including our product line. Very few units are TIG only. True Multi process refers to the combination CC (constant current) and CV (constant Voltage) output in the same machine which TIG and stick are CC output and generally a total of 3 or more sub processes like MIG, TIG or Stick. AC and DC aren't considered a process. It's considered a mode or function. That is from something ignorant chinese marketing people started calling it when they started selling their product here without a clue (LOTOS). All DC stick welders can be used as a TIG machine with an addition of a simple gas valve tig torch. We do refer to our tig/stick/plasma as multi-process since the plasma is radically different than stick or tig function. Though it is CC output, the way it outputs is radically different than a TIG or stick function, so it falls into the multi process category, though it probably would be better (though confusing) to call it a multi-purpose machine.