A couple of issues here....most 220V welders require a 50 amp circuit. Dryers and kitchen stoves are generally less than 50 amps. It can be done, but expect to blow the breaker in the middle of a weld sometimes if the machine is being used hard.
I agree that a 110V MIG/Flux-core machine should generally be on a 20 amp circuit.
Also...some clarification on terminology...there's no such thing as "gasless MIG". MIG is an abbreviation for Metal Inert
Gas....also known as GMAW or
Gas Metal Arc Welding. MIG
always uses a shielding gas...unless you like major weld defects.
You are referring to FCAW...Flux Core Arc Welding...an entirely different process that happens to use the same type of equipment, but with a different consumable wire electrode...typically, a "self-shielding" flux-cored wire. However, some flux-core wires do require a shielding gas....but it's still not MIG welding.
There is no such thing as "Flux Core MIG". They are technically two different processes.