I am new to MIG welding and after some practice (not enough) I started welding in my new floorpan. I have the machine set to its lowest setting yet I keep blowing holes through the metal. I then spend hours slowly building up weld on both sides until the hole is filled. I grind it down and them move on to blow yet another hole! My questions are:
1. How many times can I MIG weld over the same spot without destroying the surrounding metal?
2. Any suggestions on filling these holes? I've heard of using copper to back up the hole. I'm trying that this weekend.
3. After grinding I discover tiny pin holes. Should I just skim coat with some filler? Or continue to do what I have been doing, spot welding to fill the hole? (Most of the time I blow another hole through the metal, its getting frustrating!)
I have a basic Century welder with the high/low 1/2 settings and Argon/CarbonDioxide mix flowing at 24.
Thanks.
Michael
