California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 2 - Boiler and Fired Pressure Vessel Safety Orders
Article 7 - Repairs
Section 793 - Qualification of Welding Procedures and Operators

No welded repair shall be made to any boiler or boiler appurtenance until the welding procedure and operator have been qualified in accordance with Section IX of the code in the overhead and horizontal positions. The certificate of competency number of the qualified inspector authorizing the repair shall be stamped adjacent to all welded repairs made to power boilers.

On welded repairs that are completely radiographed the operator qualification may be eliminated at the discretion of the division provided the welding procedure is properly qualified inspector indicates on his report the welding procedure used and the operator employed in making the repair.