So the GF wants me to hang a piece of "art" in the dining room. She loves the look achieved by using a 5" blending disc on stainless steel. The required size is 48" x 32". I know 18ga would hang nice and straight, but the weight kinda concerns me. Would some very light tig welding on the backside (for hanger attachments), cause the 20ga to distort? I can weld 18ga with no distortion, but have zero experience with 20ga material. Opinions?