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Associate

Join Date: Jun 2009
Location: Saharanpur, Uttar Pradesh,India
Posts: 30
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Post Weld Heat Treatment for WPQ

08/28/2016 12:22 PM

Is PWHT is non essential variable in WPQ , please tell me where it is mention in code ASME SEC IX OR AWS D1.1

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Anil
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Guru

Join Date: Oct 2008
Posts: 39131
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#1

Re: post weld heat treatment for WPQ

08/28/2016 12:44 PM

Your metallurgist will know, or the welder probably knows too, if he's ever welded before.

Post Weld Heat Treatments In ASME Codes - The American Society of

ASME B31.3 PWHT Requirement - ASME (mechanical) Code Issues - En

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Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
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#2

Re: Post Weld Heat Treatment for WPQ

08/28/2016 4:22 PM

That would almost surely be an essential variable, anyway. Leaving out PWHT when needed would be a gross error.

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Guru

Join Date: Jan 2010
Location: Mineral wells Tx
Posts: 594
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#3

Re: Post Weld Heat Treatment for WPQ

08/29/2016 7:43 AM

The three main reasons why PWHT is required are:

1. Thickness

2. Material type (Number P)

3. Fluid Type (Product)

The first two are perfectly defined in ASME IX, the third corresponds to plant processes and must be analyzed separately

ASME IX sets out three types of variables for the differents welding processes:

Essential, non-essential, and supplementary.

You can find them in ASME IX from QW 252 to QW 265

WP

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Active Contributor

Join Date: Jun 2017
Posts: 13
#4

Re: Post Weld Heat Treatment for WPQ

06/25/2017 7:13 AM

PWHT is an essential variable as per reputed international codes.

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