heat input

[Ahmed Husain]

 

 

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 regards

 

 

 Ahmed H.

[IMRAN KHAN]

hello frnds                i would like to do cswip 3.1 bridging.kindly guid me how to prepare for it?i would like to know how will the exam pattern?if any body did it kindly guide me....   thanks in advance for ur reply T.IMRAN KHAN

[G Padmanabhan]

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.

--
To post to this group, send email to material...@googlegroups.com
To unsubscribe from this group, send email to materials-weld...@googlegroups.com
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.

--
With Warm regards,

G.Padmanabhan
+96895685853

[KASHKOUSHA]

dear ahmed

1-acc.to ASME IX (409.1)decrease in heat input not essential but from the metallurgical view it has a limit due to cooling rate ,micro structure,etc &it is a rule of thump
2-it is project spec., experience, may be welding book as ASM,WELDING HAND BOOK,

best regards

H.KASHKOUSHA

---

From: Ahmed Husain <ahm...@yahoo.com>
To: material...@googlegroups.com
Sent: Thu, November 11, 2010 6:53:25 AM
Subject: [MW:8197] heat input

[Ahmed Husain]

 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 <gpad...@gmail.com>
To: material...@googlegroups.com
Sent: Thu, November 11, 2010 1:24:55 PM
Subject: Re: [MW:8209] heat input

[G Padmanabhan]

Dear Mr.Ahmed
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.