OK, I thought I read and learned about controlling warpage. I welded a lip lengthwise down an 8' long square tube with my Millermatic 250. I welded two inch long beads every eight inches or so and even started at opposite ends. Well, it looked really nice, then I realized it warped like crazy.

The warping is done. Does anyone know how to un-warp it? Probably not easily done. The tube is 1.5 x 1.5 .120 wall. Standing on it has no effect. I heated it with a torch and stood on it to no avail either. I'm afraid to give it too much umpff for risk of kinking it.

Here's the kicker: My wife says I should just weld a bunch of beads on the other side and warp it back.