I have a small 120 volt wire feed welder. I have been using flux core wire.I hate the way it splatters and does not give pretty weld beads. It came with a kit for a small gas bottle to mount on the back of the welder and a regulator. If I use c02 it is stored as liquid form in the tank so it should give more use than a tank of mixed gases stored as vapor in a tank, RIGHT?? Would the weld quality be ok? If mixed gas is prefered,which one?