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- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: Weld Fractures (refrain)
- From: Robert Rollo <rrollo(--nospam--at)TEAM-PSC.com>
- Date: Wed, 20 Dec 2000 09:53:06 -0600
Title: Weld Fractures (refrain)
welding procedure was single pass SMAW with (and i misspoke previously) 1/8" 5P+ 6010 rod, again no preheat. wrong rod looks like to me and can you get 3/16" fillet from 1/8" rod in single pass ?
the rod supplier advised changing to the 3/16" 7018.
cracks appeared after final cooling at the outboard toe of the weld (more like separation of fillet from base material pipe) . . . odder still , they now tell me that they alternated sides as they stitched and yet only one side is separating . . .
welder is not certified and did not report amperage, etc.
sound like i have the wrong welder doing my work ?
thanks again for the brain time !
r o b e r t d. r o l l o
Parkhill, Smith & Cooper, Inc.
4222 85th st
Lubbock, Texas 79423
(806) 473-2200 vox
(806) 473-3500 fax
From: Davis Parsons [SMTP:davisp2(--nospam--at)flash.net]
Sent: Tuesday, December 19, 2000 6:29 PM
Subject: Re: Weld Fractures
Robert Rollo wrote:
> C 3x4.1 (A325) flange tips welded vertically to the side of a 12" Sch
> 40 (A53B) pipe for sign blade attachment.
> channel is tacked in position then we are stagger stitching with 3/16
> fillets 2" @ 6".
What welding procedure was used?
> outside temp was about 35F. weld rod was 3/16" 7018. welder attached
> one flange all the way down as indicated. when attaching the second
> flange (opp side), the welds are cracking away from base material
> (pipe) upon cooling. No applied loads.
Which weld cracked? The first weld pass or the second?
> Thoughts ? Other than alternating sides as installation proceeds ?
> Are we dealing with radial exp/contraction of the pipe ? i would have
> thought channel web would flex enough to accomodate it . . .
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