Tuesday, September 29, 2009

[MW:3361] Re: Heat Input

Gentlemen,

We've used qualified welding procedure specifications for LTCS that specifiy a root layer of 6010 (but only 1 root layer and no hot-pass) and then fill and cap layers with 7018.  This welding was performed on pressure piping under B31.3 for use in Northern Canada (min. design temp. of -46C).  The WPS was qualified, stamped by professional welding engineers and approved by the client.
It is my understanding that the root lay is limited in thickness on the WPS and therefore the total thickness and properties of the full weld are majority 7018, which is approved for LTCS.  The heat input is limited to a max. on the WPS so that the welded joint should have the adequate impact properties at low temperatures.  This will be proven during qualification but remember not to limit yourself on heat input on the WPS, use a typical heat input for your welding process and material thickness to pass the qualification.
 
Regards,
 
JZ
 

--- On Mon, 9/28/09, Muhammed Ibrahim <ibratech@gmail.com> wrote:

From: Muhammed Ibrahim <ibratech@gmail.com>
Subject: [MW:3358] Re: Heat Input
To: materials-welding@googlegroups.com
Received: Monday, September 28, 2009, 11:16 PM

E6010 will support up to -29 degree celcius only and used in pipe line root application. But if the PQR passes the impact you can use it with batch restriction.
regards,
Ibrahim

2009/9/29 BHARAT GOLE <bharatgole@hotmail.com>
E 7018-1 is acceptable up to -46 degree but selection E 6010 is not suitable for LTCS ! As per which clause it is selected for LTCS ?

Regards

Bharat B. Gole

 





Date: Tue, 29 Sep 2009 09:49:23 +0530
From: nach_sam@yahoo.com
Subject: [MW:3354] Re: Heat Input
To: materials-welding@googlegroups.com

Adi,
Heat input is a guideline for subsequent welding. The yardstick is the average  value as obtained from your PQR. Your production welding should not exceed PQR HI values.
By the way, is 6010, 7018-1 Ok for LTCS?  What is the working temp?
Shashank Vagal

--- On Tue, 29/9/09, Adi <adinraos@gmail.com> wrote:

From: Adi <adinraos@gmail.com>
Subject: [MW:3352] Heat Input
To: "Materials & Welding" <materials-welding@googlegroups.com>
Date: Tuesday, 29 September, 2009, 9:35 AM



I have done the PQR for LTCS by using 6010 & 7018-1 as per ASME SEC IX
some time i got 5KJ heat in put
What is the limitation for heat input and where it is mention?

Adi

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