i'll add my bit. It is without doubt a gas sheilding problem you have. I suggest you check the following
1. is the tip inside the copper shroud on the torch ? if not you wont be getting the gas to shield the weld. The tip needs to be inside the shroud
2. Are you sure you have an argon mix as a shielding gas, or have you topped up with, or are using pub CO2. If its CO2 you need a pre heater on the bottle neck otherwise CO2 will liqify resulting in litte or no gas at the torch
3. Are you holding the torch to far away from the workpiece? You can assess that by listening to the arc. It should be constant crackle sound. If it is an intermittent sound you are to far away, resulting in no gas shrouding the weld
4. If the above fails either give up or get some flux cored wire