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I have wondered for years what type of welding process is used to fabricate the rollcages in nascar? Having been a welder for over 30 years myself it never ceases to amaze me how bullet proof they are. I was told that they use a tig root pass then mig a cap weld but I would like to know for sure. I also hear they use untempered tuging then temper it out after fabing the cage. Hope some one can line me out on this Thanks Arc E Spark
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c.m. is tig welded with a er-70 filler rod and mild steel is mig welded.......i would say that the reason why they are so strong is due to the fact of all of the cross bracing and proper joint fitment.......(fishmouthing)
i guess you could comapre it to welding a t joint (1/4*) steel and beveling it....wouldnt it be that much stronger then a (1/4*) t joint that was just butted together ?
so blah blah blah.........its got to do with proper joint fitment and proper material.........and proper filler material
dawg -
A few months ago A thread was posted where Andy showed us a few
pictures of a chassis they were working on (Anyone remember?) I
thought in that post Andy mentioned, that most teams "mig" their
chassis and only one or two teams "tig" . I'm sure Andy will chime
in on this topic.Comment
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Except for the couple of teams mentioned, the chassis are mig welded.Comment
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I don't understand...a roll cage/chassi, especially for specific team car, not for production, is a very critical piece. Since the team conceivably has the time, why don't they TIG their roll cages and chassis? I know MIG welding produces fine welds that obviously stand up to the task, but I know TIG welding, even multi-pass, provides more control and bead management, so wouldn't it be the general choice?
I don't know much about automotive welding, and I'm just curious...
Thx!Comment
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Time and Money.....any team at any level will have
limited amounts of both. ( could be real high limits )
But in their eye's never enough of either.
The mig provides quality welds for the application
with large time savings. I have not seen any crashed
Nascar chassis but have looked at several other types
and the welds have survived pretty well.
DaveComment
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because its mild steel in nascar.......c.m. is in drag cars and it needs either preheat or post heat......which at every joint on a nascar cage would add a HUGE amount of time......and **** it only take one lap for those guys to f.it up !
and i would think that if you tried to do multi pass with a tig machine on a cage they would throw you out of the gargage........
dawgComment
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time is not
When you say they have the time to do it...they really don't. Hendrick's chassis department builds 40 new cars, updates 25 more and does over 40 crash repairs per year.
Each race team has at least 10-12 race cars. So a 4 car cup team like Hendrick has about 50 cars.
Also, the tubing is precision ground DOM mild steel tubing that has a max thickness of .120 wall and that is just the main fraim rails.
Time is something they do not have. Next time you are in the Charlotte area, I'll give you a tour of some teams.
Hope this helps.
AndyComment
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Nascar Prefomance
Andy,
A couple of weeks ago Nascar Preformance had an episode on chassis construction, was very informative. I was wondering if you got any camera time on that show?
BTW all of us members of this forum appreciate you.
Thanks
L*SComment
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Thanks Leons!
I did not see that show. I have done some work with my teams that have had shows taped there but was not actually there for the taping. I just set up the equipment before the show.
What teams did the highlight??
A-Comment
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Andy, this episode was at one of the shops that build the chassis, unfortunately I did not see the begining, and Old Timers thingy has got me,
I have no idea which shop was highlighted. The Crew Chief that are regulars
reflected on the idea that two may be three still weld up their own chassis but was a tad more greenbacks.
Sorry about not knowing more, was a good show, of course if I could remember it would be great, LOL
L*SComment
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I dream about making welds like Andys all the time. The last bead I layed down I think was duo shield but at the time I was told flux core. It looked like my son mushed some playdough into the joint.Comment
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I see! Thanks Andy.Originally posted by ASKANDY
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