AISC prohibits weld nuts?
AISC prohibits weld nuts?
(OP)
Having some issues with our structural engineer (EOR) not wanting to sign off on a design because we have nuts welded into the base.
The nuts are for shipping hard points and not accessible once the assembly is complete, so they need to be welded so the shipping hard points can be bolted in and anchored onto the trailer.
Anyways, the EOR is not signing off because they say that AISC and AWS prohibit welding of high strength heat treated bolts and nuts.
My argument is that these are not structural welds, and the weld only keeps the nut from spinning and in position.
Thoughts? Opinions?
The nuts are for shipping hard points and not accessible once the assembly is complete, so they need to be welded so the shipping hard points can be bolted in and anchored onto the trailer.
Anyways, the EOR is not signing off because they say that AISC and AWS prohibit welding of high strength heat treated bolts and nuts.
My argument is that these are not structural welds, and the weld only keeps the nut from spinning and in position.
Thoughts? Opinions?





RE: AISC prohibits weld nuts?
RE: AISC prohibits weld nuts?
When I say accessible, I mean no way to hold them with a wrench.
Well they have to be able to meet the transport forces listed in the FMCSA regs, so that is a dead end.
I might float the plate idea, thanks
RE: AISC prohibits weld nuts?
RE: AISC prohibits weld nuts?
MJCronin
Sr. Process Engineer
RE: AISC prohibits weld nuts?
I've seen grade 8.8 bolt (UTS =830MPa, not sure on US equivalent) that was welded inadvertedly (by a contractor to prevent bolts spinning during tricky erection) fracture with a gentle hit from a sledge hammer swung with a swing similar to putting a golf ball. You would be surprised by the small amount of force required to fracture the bolts.
RE: AISC prohibits weld nuts?
Does not matter which code
Most nuts are made out of not weldable steel
Same as (high strength) bolts
RE: AISC prohibits weld nuts?
https://www.mcmaster.com/#90955a121/=1ar0s9v
RE: AISC prohibits weld nuts?
I've also stopped people welding nuts for the same reason as others have stated, the heat can change the mechanical properties of the nut and make it weaker than it should be, if someone is injured or killed during transportation due to the welded nut/nuts failing who will take the blame?
“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein