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RE: L-shaped A490 Anchor Bolts

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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)> 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

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