The other day I was about to MIG weld some electrical conduit, but having not welded in awhile I practiced on some scraps. In a hurry to get things done I forgot to turn the gas bottle on, but even though there was no gas the welds looked acceptable, no excessive splatter and it wasn't flux core. It seemed to stick okay and it didn't puddle up. Not sure what wire, it wasn't my machine. Sorry for no pictures I was in a hurry to get things done. I'm not a good welder, I've MIG welded twice....
Mig Welding Without Gas Question
Mig Welding Without Gas Question