One thing to keep in mind with welding transformers is the stick type arc welder has a loosley coupled secondary to primary winding, especially when the coupling bar is all the way out. this allows the voltage to collapse on high currents, as with a stuck rod etc. In other words it is not constant-current constant-voltage as is the case with a mig welder transformer. If your load current is well below the max current the welder is rated at you may be OK.
Al
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.