i guess its the pureness of the weld, minus slag, and the cooling effect of the gas-but years ago an old welder said his stick weld were stronger than migs, and he could lay down a beautiful bead-but the mig is prob better for restarting a bead whaer you had to stop
anyway, he cut open some pipes he did, then some mig welded ones, he was right, better penetration
ok, another question, mig wire w/o gas, flux wire-never saw that addressed, wouldnt that be the same as stick?
im talking about mild steel now, not moly
i have seen some mig welded cages that looked like a newbe stick welded, and they certed, lol