We have been allowed to perform PQR's using a bug-o machine in the past by some third party inspectors. The question is, " Is this really mechanized welding" per AWS D1.5 2015? What makes it differ from single electrode SAW? My shop will be performing several PQR's in the near future for a project to be sold to California, ( it's stuff for a large golden bridge). Reference AWS D1.5 2015 Section 5.24.3.4.