Re: [MW:12526] WPS Heat treatment condition

Hi,

Change in PWHT Tine and Temperature range is a supplementary essential variable. If there is no Impact requirements,you can use your existing WPS. If there is any Impact test required , QW 407.2 applicable.

QW-407.2 A change in the postweld heat treatment

(see QW-407.1) temperature and time range

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 aggregate times at temperature(s). The PWHT total

time(s) at temperature(s) may be applied in one heating

cycle.

QW-407.6 A change in postweld heat treatment condition

in QW-407.1 or an increase of 25% or more in total

time at postweld heat treating temperature.

Thanks & Regards,

(Karthik)

Karthikeyan.S

QA/QC Manager

Getabec Energy Co.,Ltd.

379,Moo6,Soi8,Nikhomphatana,

Rayong-21180,

Thailand.

Phone: 0066 38 897035-8 (Off)

Fax: 0066 38 897034

Hand Phone: 0066 892512282

--- On Sun, 9/25/11, muthu barathi <muthu_barathi@rediffmail.com> wrote:

From: muthu barathi <muthu_barathi@rediffmail.com>
Subject: Re: [MW:12519] WPS Heat treatment condition
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Date: Sunday, September 25, 2011, 4:14 PM

Dear Sir,

You may check your existing PQR soaking temperature tolerance. Normally we will give +/- 40 to 50 degree Celsius. If it is with in that range you may use the same one.

Thanking You,

Honesty is the best Policy

With Warm Regards,

Muthu Barathi P
Mobile No:00962788269821 (Jordan)
00962775401951

From: Vijay Katkar <katkar.vijay22@gmail.com>
Sent: Sun, 25 Sep 2011 12:54:36
To: materials-welding@googlegroups.com
Subject: [MW:12516] WPS Heat treatment condition

Dear All,

Regarding heat treatment ,

I have P1 to P8 PQR with following heat treatment,

Loading temperature :- 350 ̊C

heating rate : 70 ̊C /hr

Socking temperature: 620 ̊C

Cooling rate : 70 ̊C/hr

Unloading temperature: 350 ̊C

our job requirement is

Loading temperature :- 350 ̊C

heating rate : 70 ̊C/hr

Socking temperature: 670 ̊C

Cooling rate : 70 ̊C/hr

Unloading temperature: 350 ̊C

Is it possible to use above PQR for same job if yes please tell me the reference in section IX. or this not possible then why because above all temperature below lower critical temperature..

please advice your valuable experience..............

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