Why are the SpaceX Starship, "rings" the width that they are? Wouldn't creating the rings from SS that's twice as wide reduce the welding by half?
The largest commercially available width of a roll of stainless steel in the United States is 72 inches. Apparently this is a standard size, and getting something larger would be a custom order, and not quickly and easily available.
The vendor Outokumpu (determined by photos of rolls, and the logo found upon them. Very similar to Lucents Brown Ring of Quality for the 2000's) sells 72 inch rolls.