Combination of procedure qualification as per ASME IX

I have 2 PQRs, P-1 & Gr. 1, all essential variables are met the QW-250

  • PQR 1 - GTAW qualified on the test coupon of 6 mm thickness
  • PQR 2 - SMAW qualified on the test coupon of 15 mm wall thickness.

What would be the thickness qualification of a combined WPS with 2 PQR above?

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A combined WPS GTAW + SMAW shall qualified min 1.5 to 30 mm.

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My correct answer: Yes, provided the base metal and deposited weld metal thickness limits of QW-451 are satisfied for each processes.
See interpretation no. BPV IX-17-30.

ASME BPV IX said: 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.

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Same opinion to @JANSI : 1.5 to 30mm.
ASME IX quoted: 200.2(f): A single WPS may cover several sets of essential variable ranges as long as a supporting PQR exists for each essential and, when required,
supplementary essential variable [e.g., a single WPS may
cover a thickness range from 1/16 in. (1.5 mm) through
11/4 in. (32 mm) if PQRs exist for both the 1/16 in.
(1.5 mm) through 3/16 in. (5 mm) and 3/16 in. (5 mm)
through 11/4 in. (32 mm) thickness ranges].

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According to QW200.4(a) and (b)
(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

Is this statement is Valid?

I dont know your question?