John, You state that plates "Can't be welded". This is very false. I personally have 5 pianos out there where the process was done and they span 25 years, for the oldest one. There is a specific process that must be done, but it is doable. I personally would not make any guarantees, whatsoever, and I do inform each client of this, but the fact is, They Can Be Welded. Respectfully, Joe Garrett, RPT, (Oregon) P.S. I have seen several plates that were welded "in the factory" also and are just fine.
This PTG archive page provided courtesy of Moy Piano Service, LLC