Two PQRs, one is GTAW with base metal range 5~20mm; the other is SMAW with base metal range 5~26mm. One WPS for joint with GTAW for root and SMAW for capping was supported by preceding two PQRs. So what's the qualification range of base metal for WPS? Assuming P-No.1, regardless of impact test and provision of QW200.4 (b)

20mm.

Assuming the GTAW coupon was less than 1/2 inch, you are done. QW-200 pretty much clearly says that QW-451 must be observed. To apply the root / GTAW WPS to the (production) joint then the thickness of the base metal must be within the range of that GTAW WPS.

To get around this or in other words... for Code compliance, the root wps must be made on a coupon of at least 1/2 inch thickness and then the other WPS must had been made (qualified/certified) on a coupon which is any greater base metal thickness.

In order to make a WPS (create) in must have an initial qualification coupon welded. (see "made" above)

I believe that I remember that QW-200 requirements as addressed herein were not always practice when I was a rookie in the previous century. That was then this is now.

my opinion is :5-26mm

I assume:
-first PQR test coupon 10 mm thick
-second PQR test coupon 13 mm thick

First PQR qualifies 1.6 to 20 mm (not 5 – 20 mm)
Second PQR qualifies 5 to 26 mm

The base metal thickness range of a WPS which is supported by the PQR´s above is: 5 to 20 mm

_________________
Kind regards,
Juergen Fleischfresser

Agree with your first and second portions. To my understanding, QW-200.4(b) requires the test coupon at least 13mm thick. Otherwise can NOT combine with another one.

QW-200.4(b) is for a separate qualification of the root and is limited to the processes as stated in this paragraph (assume this is PQR A).
This PQR A may be combined with an other PQR B. The qualification of the root is than as follows:
- qualified deposited weld metal as qualified with PQR A but
- qualified base metal is (regardless to the base metal thickness of PQR A) as qualified with PQR B
This is an option and not a general requirement for the qualification of each root., because of the key word “may”.

_________________
Kind regards,
Juergen Fleischfresser

Still, you have to address those key words: "in this case" first. The case is the test coupon was at least 13mm.

"regardless of impact test and provision of QW200.4 (b)"

TONYQ,

unfortunately no:
impact test requirements have an influence on the qualified base metal thickness range as follows:

I assume:
-first PQR test coupon 10 mm thick
-second PQR test coupon 13 mm thick

If impact tests are not required by the design code:
First PQR qualifies base metal T=1.6 to 20 mm and deposited weld metal t max 20 mm
Second PQR qualifies base metal T= 5 to 26 mm and deposited weld metal t max 26 mm

The base metal thickness range of a WPS (without impact test requirements) which is supported by the PQR´s above is 5 to 20 mm and the and the filler metal thickness range is max. 20 mm.


If impact tests are required by the design code:

First PQR qualifies base metal T=10 to 20 mm and deposited weld metal t max 20 mm
Second PQR qualifies base metal T= 13 to 26 mm and deposited weld metal t max 26 mm

The base metal thickness range of a WPS (with impact test requirements) which is supported by the PQR´s above is 13 to 20 mm and the and the filler metal thickness range is max. 20 mm.


In addition QW-200.4 (b) is not applicable, because the GTAW-PQR 10mm for the root meets not the requirements of this paragraph (min 13. mm).

_________________
Kind regards,
Juergen Fleischfresser

Juergen Fleischfresser,

Please show me the Code to support your sayings. Thanks.

Regards

Tony

Tony,

first use the applicable WPS tables QW-252 to QW-265. (For your processes GTAW: QW-256 and SMAW: QW-253).

If impact test are not required only the essential variables are applicable for a PQR, acc. to the table above for base metal thickness QW-403.8 and for filler metal thickness QW-404.30.

If impact test are required in addition the supplementary essential variables are applicable, acc. to the table above for base metal thickness QW-403.6.

Here are the paragraphs


Please note QW-202.4(b) is not applicable (qualified base metal thickness range of the thicker member for a joint with dissimilar base metal thicknesses) for your case.

QW-403.8 and QW-404.30 give a reference to the well known table QW-451. And only by note (2) of this table you get the reference to QW-200.2(b). Look on this table careful, especially because of the difference in the designator T (base metal) and t (filler metal).
QW-403.6 has only an influence on the lower limit of the qualified base metal thickness.
Please use never a PQR paragraph of ASME IX if it is not traceable to the above mentioned WPS tables.

Hope that helps

_________________
Kind regards,
Juergen Fleischfresser

Hi Juergen,

It's so kind of you. I really appreciate your patience. Would you please explain why QW-202.4(b) is not applicable. Every single requirement on Code has to be addressed. Otherwise, you are misleading person based on your misunderstanding.
I think we are talking about joint two PQRs togather. You look like talking about weld two plates with dissimilar base metal thicknesses. Thank you anyway.

Tony