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Change in groove type

Change in groove type

Change in groove type

Hi everybody,
See note 31, Table 4.5 in AWS D1.1 "A change in groove type (e.g., single-V to double-V), except qualification of any CJP groove weld qualifies for any groove detail conforming with the requirements of 3.12 or 3.13"
It mean that, We cannot write WPS for Double V if we had PQR single V.
- PQR qualify Single Bevel-WPS only write Single Bevel
- PQR qualify Double bevel-WPS only write double bevel
- PQR qualify Single U- WPS only write Single U
However, some project, my client have been approved WPS single V which write PQR single bevel. Pls help me clear this issue. Thanks so much

RE: Change in groove type

The contractor must revise the existing WPS to include the prequalified groove details included in figures 3.3 and 3.4. The contractor can then use any of the grooves depicted in the figures provided they comply with the parameters, i.e., groove angle, root opening, use of backing, spacers, and/or back gouging, etc.

Best regards - Al

RE: Change in groove type

it mean we will only use groove in PQR to write WPS.

RE: Change in groove type

That is correct.

Best regards - Al

RE: Change in groove type

for CJP welds there is no problem , only for PJP groove welds

RE: Change in groove type

Some of your responses are rather cryptic. Can you be more explicit.

Best regards - Al

RE: Change in groove type

I agree with Pand. If the weld in the other joint detail is a PJP and you qualified a CJP groove detail, you have to evaluate the procedure per Clause 4.11.3.

Hope this helps

RE: Change in groove type

Accroding to table 4.5 "A change in groove type (e.g., single V to double V), except qualification of any CJP groove weld qualifies for any groove detail conforming with the requirements of 3.12 or 3.13". It mean that: We can write WPS single V, Double V-CJP which support by PQR single bevel.

RE: Change in groove type

Yes, you can do that, provided the tolerances of the single V and double V meet the requirements of the prequalified joint details. If they do not, i.e. reduction in groove angle, root opening, or root face beyond what the prequalified joint details permit, then you are bound to the joint type used during qualification.

RE: Change in groove type

Hi Gents,
PQR single bevel thickness 25mm can writen WPS Double bevel thickness 50 mm.?

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