Unlike ISO 3834 or AWS D1.1 (structural steel), ASME’s welding certification is unique because it is a mandatory component of a broader certification (e.g., ‘S’, ‘U’, ‘PP’, ‘A’ stamps). 1. The Core Document: ASME BPVC Section IX (Qualification Standard) ASME Section IX is the only standard that governs welding qualifications within the ASME system. It is not a stand-alone quality manual; it dictates how to qualify welders and procedures.