Re: [MW:11069] RE: 11056] thickness

On Mon, May 16, 2011 at 7:47 PM, lakshman kumar <lakshmankumar4@gmail.com> wrote:

Dear Matee toor,

 

So many parameters has to be considered for preheating requirement, few of the elements are listed….

1.      Carbon equivalent.(generally for more than 0.4 %)

2.      Carbon percentage(Generally for more than 0.3%)

3.      Higher thickness(generally 25mm and above)

4.      Any stress relaxation for the stress developed in fabrication / weld preparation.

 

And also preheating will also increase weld ability to a small extent, uneven thermal stress in higher thickness material etc..

ASME SEC VIII – preheating part has attached for your ref…

And also it will provide guide lines for preheat requirement for various group materials,(thickness and carbon % will vary material to material)

 

Thanks & Regards

 

Lakshman kumar.B | Manager  | LANCO  INFRATECH LIMITED
Plot# 1255 | Sanjeevani Chowk | Mahanadi Vihar | Cuttack 753004

Phone : + 91-671-2445033| Mobile: +91 9937286851 | www.lancogroup.com

Go Green |The future will thank you: Lakshman.kumar@lancogroup.com, Lakshmankumar4@gmail.com

 

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Matee Toor
Sent: Monday, May 16, 2011 5:51 PM
To: materials-welding@googlegroups.com
Subject: [MW:11056] thickness

 

dears

 

pleas tell me why preheat treatment is nessesry in welding and also tell

for what composition

what thickness

 

 

thands

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dear lakshman kuman thanks for guieding and attachment you send is currupt. send it again if you can

and tell me that,

i am working on sa 387 and i required the minimum thickness on which preheat treatment is essentiol

refer me asme

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