Re: Comparing buttweld and socketweld joints

From: <Dacharaju>
Date: Mon Jul 25 2005 - 04:33:00 EDT

Paul,

Nice way to move the subject.....Hope it won't divert the subject attention....

Similar discussion was also on ASME forum ..

quote"Socket weld fittings have certain advantages over butt welding fittings:The pipe does not need to be beveled for weld preparation;No tack welding is needed for alignment as the fitting is self aligning;Weld metal will not extend into the bore of the pipe;They can be used in place of threaded fittings thereby reducing the likelihood of leaks;They provide a less expensive method of construction than other welding methods;(the contractor used random lengths of pipe and a bucket of fittings and field routes the system)."unquote.

I agree with you that contractor takes advantage on the usage. But it is the duty of our Quality Check personnel to ensure the requirements. ANSI/ASME does specify the axial gap for assembly.

Again to the statement "Socketwelding is a pain in the ass/godsend for designers because details
can be left to contractors".. In my opinion, it is a blessing to Engineering economics and Field Staff efforts for non-critical service...such as cooling water....

Whatever may be the level of computerization for designs, it is finally the physical work at site who implement the designs and not the computers.....Quality Check is the only way to define and follow....whether it is socket weld or butt weld or any acitvity for that matter...

Following link also talks about socket welds failures and fatigue testing. Interested may visit and reasearch more.....

http://www.structint.com/tekbrefs/NapaVibPapr.PDF

regards,
D.K.M.Rao.

Paul Bowers <pbowers@pipingdesign.com>
Sent by: PipingDesign@yahoogroups.com
07/25/2005 10:57 AM
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Re: [PipingDesign] Comparing buttweld and socketweld joints

Dacharaju Krishnamohan Rao wrote:

> Dear Paul,
> I was referring in terms of effort not the quality...
> regards,
> D.K.M.Rao.

It's a pet subject of mine so I was trying to goose ("to move to action; spur") interest and discussion.

Paul

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[Non-text portions of this message have been removed] Received on Mon Jul 25 04:33:00 2005