The reason you hammer and dolly welds is to stretch them back out. Welds shrink the area...see the blue, that is metal that is in need of a little stretching to get the surface area correct. Mig-welding is not the best choice for this kind of work. You must grind the weld on both sides before using a hammer and dolly. Tig, or gas welds are easily stretched without grinding. Here is an article that might help:
http://metalshapers.org/101/jkelly/index.html
John www.ghiaspecialties.com
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