(a) Welding repairs must comply with section IX of the ASME Code.
(b) A repair to a boiler or unfired pressure vessel that involves welding may be made if an inspector approves the repair and signs a record of welded repairs.
(c) Repairs by fusion welding must comply with ANSI/NB 23.
(d) Repairs listed as routine in ANSI/NB 23 may be preapproved by an inspector.