I can't speak for the W59-03 code, but in D1.1 there is acceptance and rejection criteria that is based upon the dB rating (after you figure attenuation) for pass/fail. Typically I use Table 6.2 for statically loaded, non-tubular connections for most of my inspections. I use a Krautkramer USN 58L, and it has the AWS rating system built in also, but I have never taken the time to set it up. I'm still used to the older machines that didn't have all of these features, so some things i still do the old fashioned way.