Morrisonbryce

Get tig welder run a bead in the middle on the inside on the band from out side to inside. Should not have to use filler metal just small puddle. It will cause shrinkage in that area causing it to close. (Controlled warp) Reference heat effected zones weldingtipsandtricks.com Has a video demonstrating heat distortion and how you can try to mitigate or control when welding.