GMCdp,
Practice,practice practice.
You may be right about your welder not having a low enough setting. Heat,fed have to be just right.
but usually the problem is not enough penetration instead of too much.
Thin metal is tricky, keep at it.
By the way,a professional looking weld is called that for a reason. If you don't do it for a living,it's hard to get the same results.
