No, you cannot. Don’t even think of doing it. Not only do you risk destroying the MIG welder, but you could get zapped in the process, and the last time I checked, humans are allergic to electric shocks. The multi-function models listed above can be used outdoors, and with enough gas, you should be able to shield the weld from wind and airborne contaminants. Just never in the rain, snow, floods, hail, other than hot and dry climates.