Dear all,
In my view minimum 90 deg rotation is mandatory between two long seams of the pipes while fit – up
Some of the reasons –
1. Peaking at Long seam
a. Fit up problem will raise when two long seams came close to each other
2. Hardness increases in the junction point.
3. Welding difficulty
a. Bevel preparation
b. Penetration
c. More weld width on surface
4. Long seam points are under full stress concentration – joining of 2 seams at 1 location will cause high stress formation at a single point
5. If any coating system is to be implemented air will be entrapped and will be difficult for removal.
In most of the cases client spec will clear this confusion for the minimum spacing requirement between 2 long seams.
Even in spiral welding also it is not suggestible, to keep two seams closely.
Thanks & Regards
Lakshman kumar.B | Manager - QA/QC | 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 venkat ramana
Sent: Wednesday, June 01, 2011 4:26 PM
To: materials-welding@googlegroups.com
Subject: [MW:11233] weld seperation
Dear all,
my query is when we are joining two long longitudinal seam pipes, is there allowed to one parallel line please give me a reference standard.
Regards
Venkat
+974 33423946
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