PQR Qualification
- Material: API 5L X56N SMLS
- Pipe size: NPS 20” WT 26.19 mm
- Joint design: Groove, included angle 60 deg.
- Position: 1G.
- Welding process: weld metal deposit of GTAW (7.0 mm) and SAW (19.19 mm).
A WPS shall be shown all variable in table QW-256 (for GTAW) and table QW-254 (for SAW).
We should bring all variables in these tables and range of qualified application to new WPS.
| QW-402 Joint details | GTAW | SAW |
|---|---|---|
| QW-402.1 Groove design | Groove and fillet weld | Groove and fillet weld |
| QW-402.4 Backing | n/a | Weld metal |
| QW-402.5 Backing | None | n/a |
| QW-402.10 Root Spacing | 3.0 to 6.0 mm | – |
| QW-402.11 Retainers | None | None |
| QW-403 Base metal | ||
| QW-403.5 Group number | 2 | 2 |
| QW-403.6 T limits | 16.0 to 52.4mm | |
| QW-403.8 T Qualified | 5.0 to 52.4 mm | |
| QW-403.9 t pass > 13mm | n/a | None |
| QW-403.11 P Qualified | 1 | 1 |
| QW-404 Filler metal | ||
| QW-404.3 Size | 2.4 mm | n/a |
| QW-404.4 F Number | 6 | 6 |
| QW-404.5 A Number | 1 | 1 |
| QW-404.6 Diameter | n/a | 3.2/4.0 mm |
| QW-404.9 Flux-wire class. | n/a | F7A4-EM12K |
| QW-404.10 Alloy flux | n/a | None |
| QW-404.12 Spec. or Class. A/SFA | A5.18 ER70S-6 | n/a |
| QW-404.14 Filler | Yes | n/a |
| QW-404.22 Consumable Insert | None | n/a |
| QW-404.23 Filler metal product form | Solid | n/a |
| QW-404.24 Supplemental filler | n/a | None |
| QW-404.27 Alloy elements | n/a | None |
| QW-404.29 Flux designation | n/a | F7XX |
| QW-404.30 Max. Deposit thickness (t) | 14.0 mm | 52.4 mm |
| QW-404.33 Classification | – | H4 |
| QW-404.34 Flux type | n/a | Neutral Fluxes |
| QW-404.35 Flux-wire class. | n/a | F7A4-EM12K |
| QW-404.36 Re-crushed slag | n/a | None |
| QW-404.50 Flux | None | n/a |
| QW-405 Positions | ||
| QW-405.1 + Position | All | 1G |
| QW-405.3 Vertical welding | Upward | n/a |
| QW-406 Preheat | ||
| QW-406.1 Decrease > 55 deg. C | Min. 10 deg. C | Min. 10 deg. C |
| QW-406.2 Preheat maintenance | n/a | None |
| QW-406.3 Increase > 55 deg. C | Max. 250 deg. C | Max. 250 deg. C |
| QW-407 PWHT | ||
| QW-407.1 PWHT | None | None |
| QW-407.2 PWHT (T & T range) | None | None |
| QW-408 Gas | ||
| QW-408.1 Trailing or composition: | SG-A | n/a |
| QW-408.2 Single, mixture % | 100% Argon | n/a |
| QW-408.3 Flow rate | 10-15 lpm | n/a |
| QW-408.5 Backing flow | None | n/a |
| QW-408.9 Backing or composition | None | n/a |
| QW-408.10 Shielding or trailing | None | n/a |
| QW-409 Electrical characteristics | ||
| QW-409.1 Heat input | 1.0 to 3.5 kJ | 1.0 to 3.5 KJ |
| QW-409.3 Pulsing current | None | n/a |
| QW-409.4 Current and Polarity | DC EN | DC EP |
| QW-409.8 I & E range | A: 80–150, V: 10-14 | A: 300-500, V: 28-40 |
| QW-409.12: Tungsten electrode | 2.4mm, 2%thoriated | n/a |
| QW-410 Technique | ||
| QW-410.1 String/weave | Both | Both |
| QW-410.3 Orifice, nozzle or gas cup size | 4 – 7 | n/a |
| QW-410.5 Method cleaning | grinding or wire brushing | grinding or wire brushing |
| QW-410.6 Method back gouge | None | None |
| QW-410.7 Oscillation | None | None |
| QW-410.8 Tube‐work distance | n/a | 20 – 35 mm |
| QW-410.9 Multi to single pass/ side | Multiple | Multiple |
| QW-410.10 Single to multi electrodes | Single | Single |
| QW-410.11 Closed to out chamber | None | n/a |
| QW-410.15 Electrode spacing | None | None |
| QW-410.25 Manual or automatic | Manual | Automatic |
| QW-410.26 Peening | None | None |
| QW-410.64 Use of thermal processes | None | None |
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