PQR thickness range Vs WPS thinkness range
PQR thickness range Vs WPS thinkness range
(OP)
we have a PQR for duplex carried out on 6.5mm thick pipe this according to the PQR thickness range says qualified fro 1.5mm to 13mm , we have run some WPS's using this procedure on 13mm thickness pipe, on the WPS it states max thickness welder is qualified for Is 26mm 2xt, my question is which is correct? can the welder still weld up to 26mm thick pipe even though the PQR says a maximum of 13mm
RE: PQR thickness range Vs WPS thinkness range
Someone doesn't understand how to properly document the PQR and WPS.
Best regards - Al
RE: PQR thickness range Vs WPS thinkness range
what I am saying it that the WPS then shows a minimum of 1.5mm and a maximum of 13mm thickness range qualified . if I then test a welder out on 13mm thickness pipe the welder qualification then states the welder can weld up to 26mm thickness, is this correct ? can the welder weld up to 26mm on the same PQR and WPS?
RE: PQR thickness range Vs WPS thinkness range
No, the welders must follow a qualified WPS and your qualified WPS is only valid to 13 mm.
Regards,
DD
RE: PQR thickness range Vs WPS thinkness range
RE: PQR thickness range Vs WPS thinkness range
RE: PQR thickness range Vs WPS thinkness range
The qualified range of the WPS is based on the thickness of the test coupon(s) and is independant of the welder qualification range, and vice versa.
To take this further:
A WPS qualified on 13mm thicknesses cannot be used outside the qualification range (5mm to 26 mm per ASME Section IX QW 451.1) just because the welder may be qualified to weld thicker materials. To make this even more confusing, lol, the qualiied WPS thickness range could actually be 13mm to 26mm if supplemental essential variables apply (See ASME Section IX QW 403.6).
As a final comment, if a single welder is qualified on material 13mm and over, with a minimum of three layers, he/she effectively has no thickness limitation. See ASME Section IX QW-452.1(b.
RE: PQR thickness range Vs WPS thinkness range
RE: PQR thickness range Vs WPS thinkness range
Best regards - Al
RE: PQR thickness range Vs WPS thinkness range
The bottom line is this: The welder needs to be qualified to use the WPS, and the WPS thickness range will not change based solely on the welders qualification.
The WPS thickness does not change just because the welder may be qualified to weld materials thicker than allowed by the WPS. The only way for a WPS thickness range to change would be:
1. Additional test coupon(s) are made, destructively tested, and meet ASME IX requirements to extend the qualified thckness range.
2. The Company elects to restrict, or lower the qualified thickness range on the WPS. I've observed companies that had welding procedures that were qualified up to 50 mm restrict their use to 25mm. While not the best practice, you can make the WPS more restrictive if you so choose.
RE: PQR thickness range Vs WPS thinkness range
AS PER ASME Section IX QW-452.1(b) for performance 13mm and over, with a minimum of three layers, no thickness limitation......but i have doubt in this .what is that three layer ?if it is root,fill,cap. then why we are exclude that cap and excess root penetration for thickness qualification?
QW 452.1
GENERAL NOTE: The “Thickness of Weld Metal” is the total weld metal thickness deposited by all welders and all
processes in the test coupon exclusive of the weld reinforcement.
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ap