Shane, I hear you and wish I could agree, but I believe the others are correct. That said, when it comes to "proving it" if it isn't somehow documented it wouldn't hold water if I were doing the auditing. There is no requirement for volumetric, in fact one bead in flat position will keep the process current (crazy, I know). In Kazakhstan, our QC require a minimum of 2 volumetric examinations during the 6 month period and I personally think its a good idea, but it's not code stuff.