Just to add ASME B 31.3-Process Piping into the equation:
328.2.2 Procedure Qualification by Others.
Each employer is responsible for qualifying any welding procedure that personnel of the organization will use. Subject to the specific approval of the Inspector, welding procedures qualified by others may be used, provided that the following conditions are met:
(a) The Inspector shall be satisfied that
(1) the proposed welding procedure specification (WPS) has been prepared, qualified, and executed by a responsible, recognized organization with expertise in
the field of welding
(2) the employer has not made any change in the welding procedure
(b) The base material P-Number is either 1, 3, 4 Gr. No. 1 (11⁄4 Cr max.), or 8; and impact testing is not required.
(c) The base metals to be joined are of the same P-Number, except that P-Nos. 1, 3, and 4 Gr. No. 1 may be welded to each other as permitted by Section IX.
(d) The material to be welded is not more than 19 mm (3⁄4 in.) in thickness. Postweld heat treatment shall not be required.
(e) The design pressure does not exceed the ASME B16.5 Class 300 rating for the material at design temperature; and the design temperature is in the range −29°C to 399°C (−20°F to 750°F), inclusive.
(f) The welding process is SMAWor GTAWor a combination thereof.
(g) Welding electrodes for the SMAW process are selected from the following classifications:
AWS A5.11 AWS A5.41 AWS A5.51
E6010 E308-15, -16 E7010-A1
E6011 E308L-15, -16 E7018-A1
E7015 E309-15, -16 E8016-B1
E7016 E310-15, -16 E8018-B1
E7018 E-16-8-2-15, -16 E8015-B2L
E316-15, -16 E8016-B2
E316L-15, -16 E8018-B2
E347-15, -16 E8018-B2L
(h) By signature, the employer accepts responsibility for both the WPS and the procedure qualification record (PQR).
(i) The employer has at least one currently employed welder or welding operator who, while in his/her employ, has satisfactorily passed a performance qualification test using the procedure and the P-Number material specified in the WPS. The performance bend test required by Section IX, QW-302 shall be used for this purpose. Qualification by radiography is not acceptable.