Friday, May 8, 2009

[MW:2128] Re: 2122] Zero gap butt welding

Dear friend,
U can refer AWS D 1.1, Section 4 para 4.12.4.1,but it' s for structural ,only u can have idea regarding qualification for narrowest & widest root gap & reqd. sizes also.
Regards,
Prashant Pansare (IRS)  

--- On Fri, 8/5/09, PB HEGDE <hegde.pb@isgec.com> wrote:

From: PB HEGDE <hegde.pb@isgec.com>
Subject: [MW:2126] RE: 2122] Zero gap butt welding
To: materials-welding@googlegroups.com
Date: Friday, 8 May, 2009, 10:31 AM

Hi!

We have been using this practice of zero gap butt joint for shell thk of 12 mm to 20mm , and above 75mm thk joint.

We keep the zero gap with tolerance of  0-1mm and  root face should be of 3-4mm for smaller thk and 5-6mm for thicker shell

To avoid any burn through, we require to increase the speed of weld with lower side current of WPS for root pass. This parameters are require to be established at each place

 

Regards

 

Hegde P.B.

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Muhammed Ibrahim
Sent: Thursday, May 07, 2009 4:47 PM
To: materials-welding@googlegroups.com
Subject: [MW:2122] Zero gap butt welding

 

Hi Gents,

 

Anybody having experience with zero gap butt welding (V- groove with more root face) with direct SAW in pressure vessels. Is it possible in circular seam?. If possible how much root face should be maintained?.

Thanks & Regards
Muhammed Ibrahim PK



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