Re: Welding in Cage
[Re: pro6pakRR]
#1081951
09/25/11 04:08 AM
09/25/11 04:08 AM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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holesaw the floor so you can drop the cage down thru the floor so you can get at your welds then you slide 6x6 plates between the floor and tubes. you can also put in outriggers to attach to bars
Gen 3 power 6.22@110, 9.85@135
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performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Welding in Cage
[Re: pro6pakRR]
#1081954
09/25/11 08:17 AM
09/25/11 08:17 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
That part I know .Was wondering if you can weld Cm to MS or the stock sheet metal
Yes you can weld CM to mild... at that point it has to
be tigged just like its CM... you use the same rod
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Re: Welding in Cage
[Re: MR_P_BODY]
#1081955
09/25/11 10:17 AM
09/25/11 10:17 AM
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Joined: Aug 2008
Posts: 4,066
Mo.
racerx
master
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master
Joined: Aug 2008
Posts: 4,066
Mo.
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Quote:
Quote:
That part I know .Was wondering if you can weld Cm to MS or the stock sheet metal
Yes you can weld CM to mild... at that point it has to
be tigged just like its CM... you use the same rod
Yes...but is it legal with NHRA? 
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Re: Welding in Cage
[Re: racerx]
#1081956
09/25/11 10:28 AM
09/25/11 10:28 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Quote:
That part I know .Was wondering if you can weld Cm to MS or the stock sheet metal
Yes you can weld CM to mild... at that point it has to
be tigged just like its CM... you use the same rod
Yes...but is it legal with NHRA?
That I cant say for FACT but I cant see why not IF
the mild meets the spec and so does the CM... people
add to their roll bars all the time
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Re: Welding in Cage
[Re: MR_P_BODY]
#1081957
09/25/11 10:38 AM
09/25/11 10:38 AM
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Joined: Aug 2008
Posts: 4,066
Mo.
racerx
master
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master
Joined: Aug 2008
Posts: 4,066
Mo.
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Quote:
Quote:
Quote:
Quote:
That part I know .Was wondering if you can weld Cm to MS or the stock sheet metal
Yes you can weld CM to mild... at that point it has to
be tigged just like its CM... you use the same rod
Yes...but is it legal with NHRA?
That I cant say for FACT but I cant see why not IF
the mild meets the spec and so does the CM... people
add to their roll bars all the time
Thax. Mr.P Body I've always wonder that as I'm planing adding to my cage and thought about adding cm to the ms to hopefully save a little weight in the process.......
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Re: Welding in Cage
[Re: MR_P_BODY]
#1081958
09/25/11 10:56 AM
09/25/11 10:56 AM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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It is perfectly legal with SFI to weld chrome moly to mild steel. But, all the tubing involved has to meet the SFI spec.
My question is why would you weld chrome moly to the original sheetmetal?
As far as the basic cage there are requirements of what it welds to. Box tubing must be .083" thick. Round tubing also has to be .083 for chrome moly and .118 for mild steel. Your stock unibody frame rails are not .083" in all places. When they are that thick it is usually due to layers of sheet metal. You would need to penetrate the layers. If you are welding to the floor, use a 6"X6" plate. The rear frame rails for the rear support bars can be done several ways. The best is probably a 6"X6" bent to wrap the rear frame rail. Brake the corners down to make a diamond formation. This will provide the strongest support without compromising the strength of the frame rail. The front frame rails are thick on top but layered. If you choose to weld on top of the frame it is tricky to penetrate the frame rail without burning the tubing up. I have seen several approaches.
If you want your cup on your tig torch to live welding on Mopars? You better leave the tig alone when welding to the stock sheetmetal. I choose to mig a plate to the stock metal. Then tig my chrome moly to the plate. I have seen extremely weight conscious people weld a heavy bead with a mig, grind it flat, then tig the tubing to it. I feel that is a wast of time. I don't know why but my tig hates stock mopar sheetmetal. I have tried everything from 64-97 and got the same results. Chevies and Fords seem to do just fine.
I just got through welding a roof skin on a Dakota that the guy drilled all the way through on the spot welds at the rear door corner. This was a criticle area as the headliner is in the truck. So I had to tig it to not catch everything on fire. When I got done I had to rebuild the torch head. Just another $20 on the bill. LOL
Leon
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: Welding in Cage
[Re: Blucuda413]
#1081961
09/25/11 02:23 PM
09/25/11 02:23 PM
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Joined: Feb 2005
Posts: 5,207
Menomonee Falls
DemonDust
master
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master
Joined: Feb 2005
Posts: 5,207
Menomonee Falls
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Quote:
The first time I tried to certify my car it was turned down because I had some CM bars in the MS cage. The guy that built the cage did it and I don't know why. I had to change those bars to MS and he certified it the next try.
Was probably MIG welded.. Can't MIG weld CM.. If it was tigged and was proper thickness no reason for them to reject it.. 
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Re: Welding in Cage
[Re: DemonDust]
#1081962
09/25/11 10:38 PM
09/25/11 10:38 PM
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Joined: Aug 2008
Posts: 4,066
Mo.
racerx
master
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master
Joined: Aug 2008
Posts: 4,066
Mo.
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Quote:
Quote:
The first time I tried to certify my car it was turned down because I had some CM bars in the MS cage. The guy that built the cage did it and I don't know why. I had to change those bars to MS and he certified it the next try.
Was probably MIG welded.. Can't MIG weld CM.. If it was tigged and was proper thickness no reason for them to reject it..
Bluecuda413 was it a combination of tig/mig or what? I'm curious as i'm going to add some more bars (cm)and tig  them in,but the ms bars r mig............Thax.
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Re: Welding in Cage
[Re: racerx]
#1081963
09/25/11 10:53 PM
09/25/11 10:53 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Quote:
The first time I tried to certify my car it was turned down because I had some CM bars in the MS cage. The guy that built the cage did it and I don't know why. I had to change those bars to MS and he certified it the next try.
Was probably MIG welded.. Can't MIG weld CM.. If it was tigged and was proper thickness no reason for them to reject it..
Bluecuda413 was it a combination of tig/mig or what? I'm curious as i'm going to add some more bars (cm)and tig them in,but the ms bars r mig............Thax.
I was waiting to get my car certed and the inspector
would ask what bars were what dia and thickness
before he even started the inspection... if the person
didnt know he would ask if you wanted him to continue
and if he started the inspection it cost the inspection
price weather it passed or not... if you didnt know
the specs(for the cert you were going for) and he measured
the bars at a different thickness or dia you could fail...
dont know why if the stuff is in spec
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