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-407.1 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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