I agree with you.Your project specification has to specify restriction of heat input for LTCS materials.
For Example
1.As per NORSOK Welding and Piping Inspection, for stainless and non ferrous materials the maximum variation in heat input shall be
+/-15%
2.As per PDO welding specificaiton,Average heat input per pass,decrease by more than 10% for sour service for carbon and low alloy steels.
Maximum heat input should be taken from PQR.
Dear Mr. Padmanabhan,QW-409.26 is for first layer only.QW-409.26 For the first layer only, an increase in heat
input of more than 10% or an increase in volume of weld
metal deposited per unit length of weld of more than 10%
over that qualified.
Also in SMAW or GTAW welding variables table for WPS, there is no reference to QW-409.26.
I have one more question. During production welding, heat input reading as stated in WPS will be maximum acceptable limit or as stated in PQR.
Ahmed Husain
Mob-0547170325
From: G Padmanabhan <gpadmana@gmail.com>Sent: Thu, November 11, 2010 1:24:55 PM
Subject: Re: [MW:8209] heat input
--Dear Ahmed,If heat input change is more than 10% of your PQR,WPS is not acceptable as per ASME Sec IX QW 409.26.On Thu, Nov 11, 2010 at 8:53 AM, Ahmed Husain <ahmraha@yahoo.com> wrote:
--
Dear all,
I have come across a WPS for LTCS (with impact test) in which maximum heat input figure is below 800 joules/mm, But the actual heat input figure in supporting PQR is above 800 j/mm. I have two questions.
1. WPS is acceptable or not.
2. Which code/ standard is referred to find out acceptable heat input limit.
Construction code is ASME B31.3; WPS qualification code is ASME SEC IX
With regardsAhmed H.
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--
With Warm regards,
G.Padmanabhan
+96895685853
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
--
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
--
With Warm regards,
G.Padmanabhan
+96895685853
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For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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