[MW:1320] Re: Fw: [MW:1317] Re: PWHT soaking time

Yes, as per ASME Sec-IX, if you don't have impact requirement, then soaking time is not an essential variable, but as per QW 451.1, if you qualify a process with PWHT of a test coupon 38 mm, it will qualify the base material 5 -200 mm ( without impact). as per UCS-56( ASME Sec-VIII Div.1), if we consider the material as P No.1, Gr. No. 1,2 , then for 38 mm test coupon we require 1hr. 15 minutes soaking time (min.), but for these test coupon , base material qualifies upto 200 mm.In actual if your job is 200 mm thick, then also as per UCS-56 require minimum 3.5 hrs PWHT soaking time for that thickness. hence from PWHT point of view your procedure will not qualify, because this welding procedure will not comply your code of construction.

Also, from metallurgical point of view, if you qualify any process with longer soaking time & if all the required mechanical tests pass, which automatically complies the lower soaking time ( complying minimum soaking time as per requirement of code of construction) but not vice-versa.

lower soaking time doesn't guaranty of the mechanical properties of higher soaking time.

 

 

Regards

 

On 11/17/08, kataiah@bilfal.com <kataiah@bilfal.com> wrote:

Dear Sir,

As per Table  QW-253  or QW-254  ( Essential, Supplementary Essential, Nonessential Variables table for different processes),  QW-407.2 is applicable when there is impact testing otherwise it is a non-essential variable  (as per my  understanding). QW-407.2 may not applicable
regards

P.K


----- Forwarded by Kataiah/BelleliSA on 17/11/2008 07:10 ص -----

"Emilio Cerato" <ecerato@hotmail.com> Sent by: materials-welding@googlegroups.com 16/11/2008 09:27 ص Please respond to materials-welding

To:        <materials-welding@googlegroups.com>         cc:                 Subject:        [MW:1317] Re: PWHT soaking time

Dear Friends,

QW-407.2 Said: The procedure qualification test shall be subjected to PWHT
essentially equivalent to that encountered in the fabrication of production
welds, including at least 80% of the agregate times at temperature(s). The PWHT
total time(s) at temperature(s) may be applied in one heating cycle.

Regards.

Emilio J. M. Cerato
Ingeniero Mecánico
Angel Cassanello 480
S3004EAD Santa Fe
Celular (54) 0342 156131383
Telefax (54) 0342 4601834
email: ecerato@hotmail.com
----- Original Message -----
From: <kataiah@bilfal.com>
To: <materials-welding@googlegroups.com>
Sent: Sunday, November 16, 2008 4:33 AM
Subject: [MW:1313] PWHT soaking time


> Dear Friends,
>
> Is a PQR with soaking time of 1 hrs can support a WPS  with soaking time 3
> hrs. (No Impact requirement).
> Is a PQR with soaking time of 10 hrs can support a WPS  with soaking time
> 3 hrs. (No Impact requirement).
> Is a p
>
> Regards
>
> P.K
> >
>

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