I tigged a long 6"x.250" square tube to the center of a 1/2" x 18" square plate yesterday. With our welder maxed at 300A we were able to achieve good penetration (tested first on a scrap piece) and a nice weld. The problem is, because I was rushing (and because I'm stupid) I didn't tack or clamp down the 1/2" plate. The edges curled slightly and now I'm wondering if there is an easy way to bend the plate flat again (I'd prefer to not have to start over). I do have a 40 ton shop press available as well as a torch. I am concerned about any bending operation with affecting the integrity of the weld, although the portion of the plate that curled is beyond where the tube is centered on.
Any suggestions?