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RE: Tack-welding nuts of high strength bolts

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It is not advisable to weld high carbon quenched and tempered steel.

Consider reversing the bolts and using the twist off LeJune type of bolts. You can weld a retrainer plate on the head side and leave the threaded shafts exposed. The round head LeJunes do not need to be restrained from rotation to tighten the nut. The nut is rotated relative to the spline. The only thing the retainer plate has to do is keep the bolts from falling out.

If you are concerned about damaging the exposed threads during erection, weld guide plates or guide studs to the assembly.

Regards,
Harold Sprague





From: "Garner, Robert" <rgarner(--nospam--at)moffattnichol.com>
Reply-To: <seaint(--nospam--at)seaint.org>
To: <seaint(--nospam--at)seaint.org>
Subject: Tack-welding nuts of high strength bolts
Date: Tue, 13 Jun 2006 08:00:19 -0700


Good morning,



A bridge manufacturer has requested tack-welding nuts to a splice plate
to make a blind connection of a HSS truss chord splice.  The bolts are
ASTM A325, Type 3 (plain) in a snug-tight bearing connection.  Nut
specifications are not given.  The splice plate is ASTM A588 steel.



I would appreciate any opinions on tack-welding these nuts.



Thank you.





With respect,



Bob Garner, S.E.



R. Garner

Moffatt & Nichol

Tel.:  (619) 220-6050

Fax.: (619) 220-6055

e-mail: rgarner(--nospam--at)moffattnichol.com





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