inside has less chance of an odd breeze gassin your welds. but you can set up blocks or barriers to keep the wind off ya most of the time.Should I weld outside or inside?
flux wire don't care about wind, just solid , but you can cheat too and jack up the gas pressure. i don't do it often cause i gotta buy the gas at home but guys at work stand and weld in a wind tunnel of fans with the gas cranked.
and welding has fumes you don't wanna intentionally be suckin in, you should always have a fan in the backround blowin just enough to take the smoke away, but strategically pointed not to blow directly onto your weld area.