Hello David and welcome to the site.
MIG welding is not what you want to use to weld up any panel. And hammering it out is not what you want to do anyway. The weld bead should not have any more mass than the material you are welding if you try to hammer it out you are displacing that excess mass into the rest of the panel.
Be sure to look at David and Peter's U-Tube vids and you will see what I'm talking about.
Jere
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Jere Kirkpatrick
Valley Forge & Welding
HEN-ROB Torch Dealer. 
Teaching The Fundamentals of Metal Shaping
www.jerekirkpatrick.com
All tools are a hammer except the chisel.....That's a screwdriver.
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