Back Welding Wheel Studs to a Hub?
Posted 10-10-2011 09:29 PM
I would (and did) go with press fit. Notwithstanding the complexities of welding hardened steels, the SM rules don't allow for that mod even for damage repair as it's not a recommended repair per the FSM.
To echo Jim, what are you trying to achieve?
Posted 10-11-2011 05:10 PM
Posted 10-11-2011 05:57 PM
On edit: if you want to get your fabricator geek on here is a piece about the effects of welding on steel...
Posted 10-11-2011 06:35 PM
Seemed to me that welding hardened steel would make it more brittle unless it was heat treated again. But I'm no metallurgist.
Bingo. Can't say for sure that they broke after being welded because of the random local heat treatment, but it seems a great example why not to. I would have guessed either the lugs would become brittle at the area, or the hub could become brittle causing the holes to crack.
Posted 10-12-2011 06:05 AM
Probably the studs were coming loose. Some studs need a small chamfor to completly seat against the hub, I have seen numerous times the stud loose after loostening the wheel lugs. Have broken several as a result. In one case we had to use a plazma cutter to get the wheel off the car, KILLED the wheel!!!!
Probably true, but it begs my earlier question: What was the welding trying to accomplish? Why would anybody do it to begin with? Based on that issue, "clueless" gets my vote.
Glenn Murphey, Crew Chief
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Posted 10-12-2011 08:31 AM
Posted 10-12-2011 05:57 PM
The only thing I can figure is that the guy screwed up the holes so that the studs wouldn't press fit tightly and decided to secure them with a weld.
The better way to fix that if you didn't want to buy a new one would be to fill the holes that are loose and re drill/bore them. Unless you have the equipment and chops it would be cheaper (and easier) to buy salvage uprights. If you had a stick welder, angle grinder and drill press with the right sized drill it wouldn't be too difficult.
Edit: new hub @ MSM is pretty reasonable...
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