Section IX of the ASME Boiler and P

Section IX of the ASME Boiler and Pressure Vessel
Code relates to the qualification of welders, welding operators,
brazers, and brazing operators, and the procedures
that they employ in welding and brazing according to the
ASME Boiler and Pressure Vessel Code and the ASME
B31 Code for Pressure Piping. It is divided into two parts:
Part QW gives requirements for welding and Part QB
contains requirements for brazing. Other Sections of the
Code may specify different requirements than those specified
by this Section. Such requirements take precedence
over those of this Section, and the manufacturer or contractor
shall comply with them.