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RE: Tack-welding nuts of high strength bolts

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I would strongly recommend against tack welding the nuts. Not only does this become a potential fracture problem, many bridge owning Agencies (I’m assuming an agency such as a DOT) prohibit this practice for their bridges.


Have you considered or discussed with your fabricator the use of blind bolts (a proprietary name that comes to mind is Huck Bolt)? I’m away from my office at the moment and don’t have access to my files for an address or contact number, but I’m sure you can find them in the web.


Hope this helps.





Thomas J. Cummings, PE

Manager - Bridge Design Practice

Gannett Fleming Engineers and Architects, P.C.

One Penn Plaza, Suite 2222

250 West 34th Street

New York, NY 10119

P:  (212) 967-9833 Ext. 5244

F:  (212) 268-6684

E:  tcummings(--nospam--at)


From: Garner, Robert [mailto:rgarner(--nospam--at)]
Sent: Tuesday, June 13, 2006 11:00 AM
To: seaint(--nospam--at)
Subject: Tack-welding nuts of high strength bolts


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)


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