NOMMA is the National Ornamental and Miscellaneous Metals Associations based in GA.
Something that may interest you and that you may have already in some specs are the 4 Joint Finish Categories they have produced:
Joint 1 No evidence of welded joint
Joint 2 Completely sanded joint, some undercutting and pinholes Ok
Joint 3 Partially dressed weld with spatter removed
Joint 4 Good quality, uniform undressed weld with minimal spatter
Needless to say, Joint 1 specifies the best quality weld. For more information, visit NOMMA's website.