It is called stress relieving, and it will most likely work unless there is something else going on there, i.e. one of the rails is bent or it wasn't lined up right to begin with. Or maybe you've got a mis-formed rail. There are internal stresses in the weldment that were created by the uneven heating/cooling during the welding process.
thenrie-
That is pure BS...I have done a fair amount of MIG welding, and I can tell you that it is pretty common to have stuff warp all over the place. There are things you can do to minimize how much it warps, but it can still warp.
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