Warpage help

I welded up my door handles yesterday and encountered a good amount of warpage on the door skin below where i was welding. I'm not sure why, i kept the heat super low and made sure the metal stayed cool before welding more like usual and it still warped. the warpage is about 3"x6" in diameter and about 1/4" deep. i dont want to just fill it and forget about it so i was wondering if anyone had any tips/techniques on how to shrink it back so i dont have such a deep wave to fill? Also does anyone have any tips on how to avoid this type of warpage? i usually never have much of a problem with keeping doors warpage free but this time was definitely an exception. Any suggestions would be greatly appreciated.

Make a shrinking disc. Then, push the door out, and learn how to use it.

there is a paste u can get from the east wood company to help on warpage when welding. also on some doors, u have to cut out the factory stamping or the tension put on it by the new filler piece will make the door suck in on the bottom.

from what ive herd from old school guys that build hot rods they heat the metal and then they cool the metel fast and it pops it back into place. I havent done it or personaly seen it done in real life but saw it done on monster gaurage and have herd of it being done.

how do i make a shrinking disc? i tryed searching the web for some instructions but came up empty handed. Also i have heard the idea about heating the metal and rapidly cooling it but was scared of messing up my door worse. Do you guys think heating it and cooling it would work?

the ehating and cooling is tricky i tried it and fuct some shit up bad.the only thing i can suggest is to pull the metal.and work it best u can.ur gonna have to use filler regardless

Hammer and dolly the dent if it is not that big, or you can stick and pull it, but don't go crazy and burn holes through the metal.

For making a shrinking disc, look here: http://www.metalmeet.com/forum/forumdisplay.php?f=79

You might have to join to check it out, but it's worth it. The results you can get are great. But if you choose this route, practice on something else before you try it on your door.

uh the metal is already shrunk you need to stretch it back out hamme on dolly directly on top of the weld alot. the heating up you saw on monster garage was a technique called hammer welding and it was the same technique but they were hammering the weld before it cooled if its the episode that they chopped the top on that old sedan.

i just bought a stud welder from harbor freight i think i might try that. i'm worried the door is gonna get "oil canned" by pulling it out. do you think it would be worth it to make a shrinking disc? i'm not sure i'll be able to use it correctly. if i use a shrinking disc would i have to pull it out first so its high and work from there with the shrinking disc? Sorry i'm asking a million questions, i have never had something warp this bad so i really havent done hardly any repairs like this. I've done a ton of body work in my day so i have some skils with working/shaping sheet metal so keeping that in mind which technique do you guys think i should attempt? or is it true that the metal is shrunk already instead of stretched like bp1mpin said?