Welding brace on 8 3/4, without a jig
#428117
08/04/09 09:49 AM
08/04/09 09:49 AM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
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OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Is it mandatory to have your housing in a jig when welding a brace?
Have any of you put a brace on without a jig and it not come out warped? I'll stitch it, let it cool, etc.
Better to have the rearend together when welding the brace on?
Any tips to help with the process?
Thanks in advance for any help.
PS, yeah I know the 8 3/4 is junk, dont need to get into that discussion.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Welding brace on 8 3/4, without a jig
[Re: scratchnfotraction]
#428119
08/04/09 12:43 PM
08/04/09 12:43 PM
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Joined: Apr 2006
Posts: 729
Lebanon,IN
mr2performance
super stock
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super stock
Joined: Apr 2006
Posts: 729
Lebanon,IN
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It definitely will move, I don't care how you weld it, weld it on then check it with an alignment bar, if crooked cut 0ff ends and reweld Mike
MR2PERFORMANCE RACE CARS
765 483 9371
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Re: Welding brace on 8 3/4, without a jig
[Re: mr2performance]
#428120
08/04/09 12:50 PM
08/04/09 12:50 PM
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Joined: Mar 2007
Posts: 12,013
Finally a HUSKER again
Moparnut426
I Live Here
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I Live Here
Joined: Mar 2007
Posts: 12,013
Finally a HUSKER again
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I have welded them on with the center in, no gears or bearings in it, just the center, I then used a chain, or come along and use it like a truss, put tension on it in the oposite direction the housing will flex, and you chould be fine. Mine moved only less than a 32nd of an inch. I welded it completely, and let it self cool, dont quench it, just let it stand. Should be ok, but I would definatly check it after it has cooled, and you take the truss off.
Kasey
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Re: Welding brace on 8 3/4, without a jig
[Re: mr2performance]
#428122
08/04/09 03:51 PM
08/04/09 03:51 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
It definitely will move, I don't care how you weld it, weld it on then check it with an alignment bar, if crooked cut 0ff ends and reweld Mike
 thats for sure the right way to do it. but I have welded them with the axels and center section in. was a low HP bracket car grant you. but it worked more than once and is still working. I am sure if we pulled it down and checked it with a jig it would be out.
but the axels still slide in easy and the rear makes no noise. I tack them, then go back and weld very small areas and let them cool. on a street car or low HP you can get away with it. if it was a high HP car you probably wouldn't be using an 83/4 anyway 
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Re: Welding brace on 8 3/4, without a jig
[Re: jcc]
#428124
08/06/09 08:34 PM
08/06/09 08:34 PM
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Joined: May 2007
Posts: 64
Airville Pa.
boomer
member
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member
Joined: May 2007
Posts: 64
Airville Pa.
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Quote:
Quote:
Quote:
It definitely will move, I don't care how you weld it, weld it on then check it with an alignment bar, if crooked cut 0ff ends and reweld Mike
thats for sure the right way to do it. but I have welded them with the axels and center section in. was a low HP bracket car grant you. but it worked more than once and is still working. I am sure if we pulled it down and checked it with a jig it would be out.
but the axels still slide in easy and the rear makes no noise. I tack them, then go back and weld very small areas and let them cool. on a street car or low HP you can get away with it. if it was a high HP car you probably wouldn't be using an 83/4 anyway
Also tap each weld with a slag hammer to relieve it as it cools and it will not pull.....
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Re: Welding brace on 8 3/4, without a jig
[Re: boomer]
#428125
08/06/09 10:42 PM
08/06/09 10:42 PM
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Joined: Jan 2003
Posts: 6,145
Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,145
Melbourne , Australia
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Some take short cuts and get away with, most don't. Have it done properly and save yourself headaches in the long run.
AL....
Alan Jones
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Re: Welding brace on 8 3/4, without a jig
[Re: Von]
#428126
08/06/09 10:58 PM
08/06/09 10:58 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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I've welded a few back braces on, if you do short welds jumping around so you dont heat it too much it works fine... if your going to shorten the housing, put the ends on last.... JMO 
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Re: Welding brace on 8 3/4, without a jig
[Re: Von]
#428127
08/07/09 12:32 AM
08/07/09 12:32 AM
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Joined: Jul 2004
Posts: 19,318
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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I had my friend do mine and he used a jig and his welds look flawless.......if that matters. How much can it really cost to do it right and leave out the guess work?
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Welding brace on 8 3/4, without a jig
[Re: Thumperdart]
#428128
08/07/09 08:55 AM
08/07/09 08:55 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:
I had my friend do mine and he used a jig and his welds look flawless.......if that matters. How much can it really cost to do it right and leave out the guess work?
I have a alignment bar also and if it needs it I put
it in my press to tweak it. After I measure the flanges
with a straight edge attached to see if the flanges are
parallel to each other
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Re: Welding brace on 8 3/4, without a jig
[Re: Von]
#428131
08/07/09 12:53 PM
08/07/09 12:53 PM
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Joined: Aug 2006
Posts: 290
Cincinnati, Ohio
d7cook
enthusiast
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enthusiast
Joined: Aug 2006
Posts: 290
Cincinnati, Ohio
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I don't think having a jig installed when welding on a backbrace will do anything. The welding puts stress in the housing whether a jig is involved or not. Stitch welding it and moving around a lot with lots of cooling time minimizes the stress. Or burn it on there and weld the ends on last.
1967 Coronet, 1989 Daytona tube chassis.
Former cars, 66 Charger, 67 R/T, 69 Coronet, 67 Dart GT.
-Banned for life from V8Buick.com-
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Having a jig is the best way but a guy has to do what he has to do with, in most cases 
