WPS-IEW-2026-104
Rev. 0VALIDATEDASME IXPipe / PipelineGTAW fused-root + filler, 316L process piping for cryogenic duty
100
score
Base Metals & Thickness — QW-403 / QW-451
- Specification
- SA-312 TP316L
- P-Number
- P-No. 8
- Group No.
- 1
- Dissimilar side
- Same P-No.
- Qualified range
- 4 – 8 mm
- Coupon T
- 8 mm
- Diameter
- OD 21.3 – 219.1 mm
- Toughness
- CVN specified
Filler Metals — QW-404 / QW-432 / QW-442
- Filler spec
- SFA-5.9
- Classification
- ER316L
- F-Number
- F-No. 6
- A-Number
- A-No. 8
- Process
- GTAW
- Transfer mode
- —
- Joint type
- V-Groove Butt
- Position
- 6G
Thermal Cycle — QW-406 / QW-407
- Preheat min
- 15 °C
- Interpass max
- 150 °C
- PWHT
- Not required
- PWHT soak
- —
- PWHT hold
- —
- Joint design
- Single-V 70°, 1.5 mm gap, fused root with pure Ar backing
Electrical, Technique & Shielding — QW-408 / QW-409
- Current
- DCEN
- Amperage
- 90–160 A
- Voltage
- 10–14 V
- Travel speed
- 90–150 mm/min
- Heat input cap
- 1.5 kJ/mm
- Shielding
- Argon 99.995% (I1)
- Flow
- 12 L/min
- Backing
- Argon 99.995%
- Supporting PQR
- PQR-IEW-2026-104
Validation Findings
latest run 12 Feb 2026 by a.subramanian@isgec.com
Supporting PQR referenced
EssentialQW-200.1 / QW-200.2Qualified by PQR PQR-IEW-2026-104. Traceability established.
Base metal P-Number assigned
EssentialQW-403.1 / QW-422Base metal group P-No. 8 Gr.1 — SA-312 TP316L.
Dissimilar-metal weld compatibility
EssentialQW-403.2 / QW-403.3Joint is between identical P-Numbers — no dissimilar-metal restrictions apply.
Thickness qualification range (coupon)
EssentialQW-451.1 / QW-451.2Range 4–8 mm within qualified 4–8 mm for 8 mm test coupon.
Thickness range sanity
Non-EssentialQW-451Commercial range 4–8 mm is within conventional procedure limits.
Small-bore thin-wall root control
Non-EssentialQW-404.30 / QW-405Diameter statement “OD 21.3 – 219.1 mm” compatible with GTAW root technique.
Minimum preheat temperature
EssentialQW-406.1Preheat ≥ 15°C satisfies the 10°C minimum for P-No. 8 base metal.
Interpass temperature ceiling
EssentialQW-406.3Interpass 150°C within 150°C ceiling (toughness-restricted).
Thermal window logic
Non-EssentialQW-406Thermal window 15–150°C is internally coherent.
Mandatory PWHT by thickness/code
EssentialQW-407.1 / UCS-56PWHT not invoked — permitted for this material/thickness/code combination.
PWHT cycle parameters
EssentialQW-407.4 / QW-407.5PWHT not required — cycle parameters not applicable.
PWHT soak window & hold adequacy
Suppl. EssentialQW-407.5 / UCS-56 TablePWHT not required — soak band check not applicable.
F-Number consistent with process
EssentialQW-404.3 / QW-432F-No. 6 (ER316L) is consistent with GTAW.
Weld-metal A-Number compatibility
EssentialQW-404.5 / QW-442A-No. 8 weld deposit is chemically matched to P-No. 8.
Shielding gas / medium per process
EssentialQW-408.1Shielding medium “Argon 99.995% (I1)” acceptable for GTAW.
Root backing gas protection
Suppl. EssentialQW-408.5 / QW-408.8Root protection declared: Argon 99.995%.
Shielding gas flow rate
Non-EssentialQW-408.1Flow 12 L/min within the 8–20 L/min band for GTAW.
Current type & polarity
EssentialQW-409.1 / QW-409.4DCEN polarity consistent with GTAW and ER316L.
Amperage operating window
Non-EssentialQW-409.2 / QW-409.3Amperage 90–160 A inside the GTAW operating envelope.
Arc voltage operating window
Non-EssentialQW-409.4Voltage 10–14 V inside the GTAW operating envelope.
Travel speed control
Non-EssentialQW-409.9Travel speed 90–150 mm/min is plausible for GTAW.
Heat input ceiling (toughness)
Suppl. EssentialQW-409.1 (suppl. essential)Heat input ≈ 1.49 kJ/mm within 1.5 kJ/mm toughness ceiling.
Welding position qualification
Non-EssentialQW-405 / QW-461.96G inclined-fixed qualification covers all pipe groove positions (QW-461.9 matrix).
GMAW metal-transfer mode
EssentialQW-409.32Transfer-mode variable applies to GMAW only (GTAW exempt).
Process admissibility under code
EssentialQW-250 seriesGTAW is an admissible process under ASME IX.
ISO 15614 impact-test mandate
Suppl. EssentialQW-403.5Notch-toughness regime declared — impacts covered as supplementary essential variables.
Storage-tank qualification route
EssentialQW-200 (via API 650 §9.2)Tank-specific routing not applicable.
IBR statutory governance
EssentialQW-201IBR statutory route not applicable to this scope.
Administrative data completeness
Non-EssentialQW-201.1Administrative header fields adequately populated for issue.
Group Number under toughness
Suppl. EssentialQW-403.5Group No. 1 recorded for notch-toughness control.
Run History
a.subramanian@isgec.com
12 Feb 2026, 09:30 pm
PASS
30/0/0