I wish I would have read this thread two days ago! I made the perfect patch panel to weld in to shave my drivers door. I was so carefull in tacking it in and letting it cool. But I ended up having the same problem as the originator of this post, as soon as I welded it up it warped!
There is a reinforcement plate right around the warped area. It is very difficult to get behind it with a dolly. I was able to get some of the dent out but not all. HELP! How can I get this thing out? Can I put heat on it? How much heat, where do I concentrate the heat at? I have no experience in shrinking metal, so any advice would be greatly appreciated!