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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