Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

RE: L-shaped A490 Anchor Bolts

[Subject Prev][Subject Next][Thread Prev][Thread Next]
I seem to recall that is referred to "pinging" the threads. Right?

Joseph Grill

On May 3, 2013 9:15 AM, "Harold Sprague" <spraguehope(--nospam--at)hotmail.com> wrote:

> Mechanical deformation:
> My preference is to mechanically deform the threads to prevent nut
> rotation.  Mechanical deformation is performed by placing the tip of a
> punch at the point where the nut intersects the threaded shaft.  The 
> punch is struck deforming the threads, locking the nut in place.
> 
> Welding:
> Even though you will not have a heat transfer from the arc initiation to
> the opposite side, you still can generate a crack from the arc initiation
> through the nut.  I have been challenged on this in the field by job
> superintendents and by engineers.  I have taken a hammer to tack welds on
> QT and alloyed steel and have fractured many welds to demonstrate brittle
> welds and crack initiation.  You might get by with 30 tacks before you
> crack a nut, but it is not worth the risk.  I have also been on a project
> in which 12 out of 12 nuts cracked.  Again, it is not worth the risk. 
> Tack welds should only be used on weldable steels to provide temporary
> alignment prior to a finish weld.
> 
> Mechanical deformations are cheaper than welding (a process is eliminated
> in the fabrication) and there is no risk of a cracked element.  These are

Truncated 766 characters in the previous message to save energy.

-------------------------------------------------------------------------
Post your message to the list by sending it to: 
   SEAINT-SEAOSC(--nospam--at)mail-list.com.

The email messages sent to the list will be saved in an archive on the World Wide Web.
These archives are located at:
    http://archive.mail-list.com/SEAINT-SEAOSC

To contact the list owner, send your message to:
   SEAINT-SEAOSC-list-owner(--nospam--at)mail-list.com.

Sponsored By: Pacific Structural & Forensic Engineers Group, Inc. (PSFEG)

To unsubscribe, switch to/from digest, get on/off vacation, or change your email address, click here.
<http://cgi.mail-list.com/u?ln=seaint-seaosc&nm=seaintma%40euken.net>