업무에 수고 많습니다.

협력업체에서 제출한 두개의 PQR 을 이용하여 하나의 WPS 를 작성하려고 합니다.

A-PQR : CS, GTAW, 5.5mm, PWHT

B-PQR : CS, GTAW (1.2mm), SMAW (25mm), PWHT

원하는 것

B-PQR 의 GTAW root pass 두께가 너무 얇아서 좋지않음. 만약 이 PQR 을 이용하여 WPS 를 만들면

GTAW 를 root pass 까지만 할 수 있음. Hot pass 는 SMAW 를 사용할 수 밖에 없음.

그래서 ASME IX. QW-200.4 b)에 따라서 두개의 PQR 을 이용하여 하나의 WPS 를 만들려고 하는데,

13mm requirement 가 눈에 걸립니다.

"A-PQR 이 13mm 가 안되기 때문에 두개의 PQR 을 합쳐서 하나의 WPS 를 만들수 없다" 라는 것이

지배적인 의견이나, 딱히 안된다고 규정된 것도 없는 거 같아서 문의드립니다.

혹시 가능성이 있는지요?

Interpretation 등이 있으면 제일 좋습니다.

확인하셔서 회신 부탁드립니다.

참고로, ASME IX 관련항목을 capture 하여 아래에 붙여 놓았습니다.

QW-200.4 Combination of Welding Procedures
(a) More than one WPS having different essential, supplementary
essential, or nonessential variables may be used
in a single production joint. Each WPS may include one or
a combination of processes, filler metals, or other variables.
Where more than one WPS specifying different processes,
filler metals, or other essential or supplementary
essential variables is used in a joint, QW-451 shall be
used to determine the range of base metal thickness and
maximum weld metal thickness qualified for each process,
filler metal, or set of variables, and those limits shall be
observed. Alternatively, qualification of WPSs for root
deposits only may be made in accordance with
QW-200.4(b).
When following a WPS that has more than one welding
process, filler metal, or set of variables, each process, filler
metal, or set of variables may be used individually or in
different combinations, provided
(1) the essential, nonessential, and required supplementary
essential variables associated with the process,
filler metal, or set of variables are applied
(2) the base metal and deposited weld metal thickness
limits of QW-451 for each process, filler metal, or set of
variables are applied
(b) For GTAW, SMAW, GMAW, PAW, and SAW,
or combinations of these processes, a PQR for a process
recording a test coupon that was at least 1⁄2 in. (13 mm)

thick may be combined with one or more other PQRs
recording another welding process and any greater base
metal thickness. In this case, the process recorded on the
first PQR may be used to deposit the root layers using
the process(es) recorded on that PQR up to 2t (for shortcircuiting
type of GMAW, see QW-404.32) in thickness
on base metal of the maximum thickness qualified by the
other PQR(s) used to support the WPS. The requirements
of Note (1) of tables QW-451.1 and QW-451.2 shall apply.

감사합니다