weld procedure
weld procedure
(OP)
Hi!
I am looking for some advice regarding the approval range of a WPQR we have, relating to a certain joint fit up.
We have a nozzle 1" Sch 80 4.55mm thick, this is being welded to a flange which is drilled to the internal bore of the 1" pipe. Our weld procedure is qualified upto around 8mm thick.
The thickness of the flange is 50mm thick, our weld thickness is is 4,55mm thick with some re-inforcement, will our weld procedue cover this set up?
I would call the fit up a tee joint
I am looking for some advice regarding the approval range of a WPQR we have, relating to a certain joint fit up.
We have a nozzle 1" Sch 80 4.55mm thick, this is being welded to a flange which is drilled to the internal bore of the 1" pipe. Our weld procedure is qualified upto around 8mm thick.
The thickness of the flange is 50mm thick, our weld thickness is is 4,55mm thick with some re-inforcement, will our weld procedue cover this set up?
I would call the fit up a tee joint





RE: weld procedure
What you describe is a fillet welded nozzle to a flange. If this is the case, a WPS for fillet welds supported by a WPQR for a groove weld would work.
Read ASME B&PV Code, Section IX, especially QW-451.4. You make no mention of base materials, I would presume you are working with P-No 1 base materials?
RE: weld procedure
The weld will be classified as a butt weld, the material is P43 Nickel alloy.
RE: weld procedure
RE: weld procedure
The price of qualifying a procedure for this material is massive.
RE: weld procedure
I can't follow what you are doing. Can you attach a sketch of the weld joint? Is the entire flange solid P-No 43 or is there a corrosion resistant weld overlay? What is the overlay thickness?
RE: weld procedure
RE: weld procedure
If you are talking about Joint 01 in your sketch - no problem, your WPS is fine.
If you are talking about N5, N6, N7 & N8 then you have a problem.
QW-202.4 Dissimilar Base Metal Thicknesses. WPS
qualified on groove welds shall be applicable for production
welds between dissimilar base metal thicknesses provided:
(a) the thickness of the thinner member shall be within
the range permitted by QW-451
(b) the thickness of the thicker member shall be as
follows:
(1) For P-No. 8, P-No. 41, P-No. 42, P-No. 43, PNo.
44, P-No. 45, P-No. 46, P-No. 49, P-No. 51, P-No.
52, P-No. 53, P-No. 61, and P-No. 62 metal, there shall
be no limitation on the maximum thickness of the thicker
production member in joints of similar P-Number materials
provided qualification was made on base metal having a
thickness of 1⁄4 in. (6 mm) or greater.
You noted that your WPS was good up to 8 mm which leads me to believe that the base metal for your PQR was 4mm. This is less than the required 6mm as per QW202.4 (b)
Regards,
Kiwi