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Are you referring to the center hub hole being welded up? I did 2 discs with a 120 volt wire feed welder and one of them cracked 3 times. We had good clean steel and proper bevels. The patch for within a 32nd all the way around. Last time we used a propane weedburner to preheat the metal before weld...

I've build 4 from 22" discs, even with handles, feet and
1 1/4" lip they are light enough to easily handle.
My personal disc is 26" with handles, feet and lip it is nearly 1/2" thick. Cooks great but it's extremely heavy.
I really like the 22" size