Butt Welding 18 Gage w/MIG?

here are a couple tips that may help you, wire size needs to be .022 -.025 dia, small gap,about the size of the wire. I like to snip the burnt end off the wire before each weld, it makes for less weld metal in each tac. if the weld is still to big or sticking up to high try less wire speed, also try to lift the trigger before you pull away from the weld . If you pull back and then let go of the trigger you can "pull" the weld out as you move away.. like everyone says ..lots of playing with it untill you get it right...hope this helps ...Ron