And to add, it can be done. hell, TR, has welded thousands of sets. Champion beadlocks used to weld locks to customer wheels (not sure if they do still) but most of these AL lock jobs had a Machined lip with a different weld geometry than a standard ring could afford on a non machined wheel. There are several contributing factors to setting up reliable aluminum beadlocks.
Just to say an example, I cannot tell you how much materail certifacation/testing, and weld testing with different processes, fillet geometry, weld settings, burn time, gun angle, etc etc I have spent at work on our stainless steel low tension freezer belt. and its stainless. a relatively easy material to work with. Aluminum can be impossible to get a Air tight Structual weld on if you do not know what you are doing.