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Welding to hex nuts

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When connecting to members in steel framing that has limited or no access to
one side of the joint, it is frequently specified that the nut be tack
welded to the member at the blind side of the joint.  I know that applying
heat to the end of a bolt (by welding or flame cutting) is not recommended
because it may change the material characteristics of the bolt right at the
area that is most important (where the nut engages the bolt threads).  Is
there also a similar concern when tack welding the nut??   Is there any
difference between a A563 or a A194 nut in this regard??

All opinions greatly appreciated.

William Pulyer PE
Charlotte, NC