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Re: Tack-welding nuts of high strength bolts

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It is being routinely done for the stated purpose (pedestrian HSS bridges), and was proven to be OK by many years of practice.
IMO, if properly specified, the welding does not affect the properties of the bolt or nut and is acceptable.  The tack welding has to be detailed to be very limited - just to resist the applied torque with an appropriate SF.
Steve Gordin SE
Irvine CA
----- Original Message -----
Sent: Tuesday, June 13, 2006 8:00 AM
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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