Threaded Stud to HSS Connection
Threaded Stud to HSS Connection
(OP)
I'd like to weld a 1/2" dia A108 threaded stud to an HSS face and attach a plate with a standard hole to it, such that the plate sits flush to the hss face.
I am seeing that the base weld for a 1/2" dia threaded stud is 5/8" in diameter, which would interfere with the plate with a standard hole.
it would seem I would need to provide an oversized hole and a slip critical connection to apply any kind of shear force to the stud.
I'm dealing with relatively small loads, so is there another solution out there i am not seeing?
I am seeing that the base weld for a 1/2" dia threaded stud is 5/8" in diameter, which would interfere with the plate with a standard hole.
it would seem I would need to provide an oversized hole and a slip critical connection to apply any kind of shear force to the stud.
I'm dealing with relatively small loads, so is there another solution out there i am not seeing?






RE: Threaded Stud to HSS Connection
The other way is to have an oversized hole in your main plate, have that plate flush with the tube, then use a 3/16" larger washer plate with a standard hole over the main plate. Then weld the washer plate to the main plate.
The only other thing that comes to mind here is using a chiseled point on your stud and create a sort of double groove weld at its end to avoid the extended fillet condition.
RE: Threaded Stud to HSS Connection
Mike McCann
MMC Engineering
RE: Threaded Stud to HSS Connection
You might put some fairly tight controls on the oversize of the stud fillet weld, or grind it a bit to clean it up. Then have the fabricator or a machine shop make some small countersinks on the back side of the plate to clear the weld. Some/much screwin around. Then you have to check the studs as short cantilevers w.r.t. shear loading. This shouldn’t hurt friction btwn. the pl. and the HSS much (slip crictical??), use a heavy washer under the nuts. Like any other bolted connection on an HSS you could still have out of plane pl. bending on the tube face.
RE: Threaded Stud to HSS Connection
RE: Threaded Stud to HSS Connection
RE: Threaded Stud to HSS Connection
I decided to go with the countersunk heads, and not do a thru-bolt due to architectural considerations.
I eliminated the blind bolt due to regional contractor reluctance and the penetration in the exposed hss member.
I should note that AISC also recommendeds the countersunk holes on pg 7-15 14th ed for threaded studs.
Also, I'm not convinced that bending of the stud needs to be considered in a plate mounted flush to the hss face, but I welcome any further comment.
Finally, for future reference, the dimension E in the attached pdf from Nelson Stud indicates the weld diameter, although it is never shown in their diagram.