Per ASME B31.3:2010
321.3.2 Integral attachments.
"Integral attachments include plugs, ears, shoes, plates, trunnions (sp?), stanchions, structural shapes, and angle clips, cast on or welded to the piping. The material for integral attachments attached by welding shall be of good weldable quality. [See Para 321.1.4(e) for material requirements.] Preheating, welding, and heat treatment requirements shall be in accordance with Chapter V." ...
Chapter V is the Fab, Assy, And erection chpater, which (among quite a lot of other things), calls for qualification of the welder to conform to ASME IX