PQR Qualification Thickness range (ASME IX) 1

[Mateeng]

Hi Mates,
Actually I stuck with finding the answer to my question below.
What is the qualified thickness range for a PQR used dissimilar thicknesses with same P No. based on ASME IX. As an example I have a PQR used two different thickness e.g. 10 mm and 16 mm. What is the max thickness range I can used. 20 mm or 32 mm?
Thanks

 

[david339933]

See Attached Interpreation.

 

[metengr]

See QW-202.4 for your situation

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, P‐No. 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.
(2) For all other metal, the thickness of the thicker
member shall be within the range permitted by QW-451,
except there need be no limitation on the maximum thickness
of the thicker production member provided qualification
was made on base metal having a thickness of 11/2 in.
(38 mm) or more.
More than one procedure qualification may be required
to qualify for some dissimilar thickness combinations.

 

[Mateeng]

Thanks David for interpretation posted. Very helpful.
Meteng, Thanks for your post too. Just need a little more help, if you do not mind.
I did review the QW-202.4 and it is mainly for a PQR with similar thickness and how can be used for a WPS with dissimilar thicknesses application. Crystal clear.
Any hint how to interpret the QW-202.4 to reach the interpretation posted by David.

Thanks

 

[DekDee]

Mateeng,
Clean your glasses !!!
This is what you wrote:
I did review the QW-202.4 and it is mainly for a PQR with similar thickness

This is what metengr posted for you:
QW-202.4 Dissimilar Base Metal Thicknesses

????????
Regards,
DD

 

[david339933]

The interpretation posted and QW-202.4 are telling you different things. The interpretation is stating what the qualified thickness of the WPS is using dissimiliar base metal thicknesses in the test coupon, while QW-202.4 is telling you what the WPS needs to be qualified to, in order to apply to dissimiliar base metal thicknesses in production.

So interpretation tells you that you are qualified to x thickness
QW-202.4 is telling you that the both thicknesses must be within "x thickness". With exceptions as noted in QW=-202.4, P8 etc....

 

[DekDee]

mateeng,
If the 16 mm was tapered down to 10 mm then your WPS range would be Base Metal 1.6 mm to 20 mm / Weld Metal 20 mm max

If the 16 mm was not tapered down to 10 mm then your WPS range would be Base Metal (T1) 1.6 mm to 20 mm / Base Metal (T2) 5 mm to 32 mm and Weld Metal 20 mm max
Hope that helps,
Regards,
DD

 

[DekDee]

I need to qualify my comments above (and must admit I am not sure of correct answer) for a third scenario.
First scenario above - I think no problem
Second scenario above - I think no problem if it is single or double bevel.
Third scenario - similar to noted in attached interpretation (Double Vee)

What would be the qualified Base Metal and qualified Deposited Weld Metal thicknesses on a 16 mm to 10 mm coupon if there was no taper but both materials had weld preparation (as per attached detail) ?
Cheers,
DD

 

[metengr]

The answer lies with the P-No's being the same or different between joining two dissimilar thicknesses.

 

[Mateeng]

Thank you everybody,
All answers and clarifications were helpful. Actually I got my answer by reviewing the interpretation. Still wondering how QW-202 can lead us to understand the qualified thickness range of a PQR with a dissimilar thickness plates or pipes Without looking on the interpretation.
I mean the Code did not describe or already provide a clue to find the qualified thickness range of a PQR with a dissimilar thickness test coupon.
I promise to clean my glass.

Thanks