ASME BPVC IX · 2025 Assistant

ASME BPVC Section IX — 2025 Edition

Offline assistant for welding, brazing and fusing qualifications. Calculators apply the qualification-range rules of the code; lookups index the P-Number, F-Number and variable-classification tables.

Procedure range

Coupon thickness → qualified base-metal and weld-metal ranges, plus required test specimens (QW-451).

Welder range

Position, diameter and deposit-thickness limits for performance qualification (QW-452, QW-461.9, QW-433).

Heat input

Arc energy from voltage, current and travel speed (QW-409.1).

P-No lookup

Search base metals by specification, grade or UNS (Table QW/QB-422).

F-No / A-No

Filler-metal F-Numbers (QW-432) and ferrous weld-metal analyses (QW-442).

Variables

Essential, supplementary-essential and nonessential variables per process (QW-25x).

This is an unofficial, offline reference tool. Results must be verified against your licensed copy of ASME BPVC Section IX. It grants no ASME certification and reproduces no code text.

Procedure qualification thickness ranges

Bend test type Test coupon thickness T

mm

Deposited weld metal thickness t (single process/welder)

mm

Welding process

Enter T and t to compute the qualified ranges.

Notes

QW-403.9 (single pass over 13 mm) and the supplementary-essential variables referenced in QW-250 may further restrict these ranges; QW-202.2–202.4 exemptions supersede them.
Fillet welds: a groove-weld qualification qualifies all fillet sizes on all thicknesses and diameters (Table QW-451.4).
Combination of procedures: see QW-200.4.

Welder performance qualification limits

Test coupon Weld type Test position Weld metal thickness t in coupon (all welders/processes)

mm

t ≥ 13 mm deposited with at least three layers Outside diameter of test coupon (pipe)

mm

Select coupon, weld type and position to see the qualified limits.

Alternate F-Numbers (QW-433)

Qualified with (F-No.)

Backing

Heat input

Arc voltage V

Welding current A

Travel speed

Efficiency η (optional)

H = (V × A × 60 × η) / v — enter any three known values.

QW-409.1 (supplementary essential variable) is an increase in heat input; 60 converts minutes to seconds so H is in J/unit length.
Waveform-controlled machines: see Nonmandatory Appendix H for heat-input determination.

Base metal P-Number lookup

Spec	Grade / type	UNS	Min tensile ksi (MPa)	P-No.	Group	Composition / form

Includes the brazing P-No. column for joints qualified for brazing. Materials not listed are unassigned — see QW-421/QW-422.

Filler metal F-Numbers

F-No.	SFA spec	AWS classification	UNS

Ferrous weld metal A-Numbers

A-No.	Weld deposit type	C %	Cr %	Mo %	Ni %	Mn %	Si %

Single values are maxima; only listed elements determine the A-Number (QW-442).

WPS essential variables by process

E S N E = essential, S = supplementary essential, N = nonessential

Special-process (overlay) variables are in tables QW-253.1 … QW-257.1; hybrid welding in QW-220; performance variables for welders/operators in QW-35x/QW-36x.
Symbols: ϕ change, + addition, − deletion, > increase, < decrease, ↑↓ vertical up/down, ± add or delete.