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Thread: Axle Truss ?

  1. #1
    Join Date
    Jan 2009
    Location
    Oregon
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    17

    Default Axle Truss ?

    Hey guys, I'm a newb to the site and gettin back into welding after a really long break,(like high school)!
    I am working on a 94 Jeep, D44 & D30, chromemoly axles in both, ARB in the 44.
    I would like to truss both axles as a project
    If I remember right, I can't weld mild steel to the cast iron pumkin-head ?
    I've got a MM252, can it be MIG welded , can it even be stick welded ?
    Or whats the best possible may to truss these things ?
    I would really appreciate all comments.
    Thanks guys Jon

  2. #2
    Join Date
    Sep 2005
    Location
    Evansville, IN
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    2,348

    Default

    I have seen several different truss designs for axles. one that I remember they used a piece of flat bar across the pumpkin and contoured it and then coped a piece of tubing to fit the shape. then on the other end it was coped to the tube and it was only welded on the two ends not in the center.

    Another design was was merely reinforcements, fitted to the pumpkin and tapered to the axle tube. Not knowing that axle I would used the top method.

    If you have a torch you can heat and beat the piece into a shape close to the contour of the pumpkin, then heat it and clamp it into position and hit it with a dead blow hammer to fit the final shape. Once it is shaped and welded to the ends it should not move. Also if your posative it has to be welded then NI99 rod can be used on Cast Iron. Its a nickle rod and it burns really soft so it takes a delicate touch.

    Best of luck,
    Paul

  3. #3
    Join Date
    May 2008
    Location
    Belle Plaine Iowa
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    Default

    Ive heard the common add on trusses (the bars under the center out to the spring mounts) typically pull the axles out of alignment. Apparently the guys that put them on get them too tight and pull the axle tubes in a downward arch.
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  4. #4
    Join Date
    Jan 2009
    Location
    Oregon
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    17

    Lightbulb Thanks guys

    Paul & Flyingpig, in that order.
    Paul, thats a good idea, I appreciate it.
    I think I could run the truss the length of the tube and right at the pumpkin, go up and over, and maybe even web it in 2 places, and gusset the webs.??

    Flyinpig, I'm running the truss up on top of the diff, I don't want to loose ground clearence, but I do appreciate the thought about stressing the axles, don't want to do that, they were pretty spendy.
    Thank you both..

    Jon

  5. #5
    Join Date
    Dec 2008
    Location
    Arizona
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    Default

    I know I've seen them welded, the axle tubes are typically plug welded to the center sections. I believe the center sections (diff) are cast steel, and not cast iron and as such probably are very weldable. If you're going to TIG it I'd probably try "missile rod" which is great at mixed metals.
    Last edited by nocheepgas; 04-02-2009 at 09:52 PM.
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  6. #6
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    Jan 2009
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    Oregon
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    Lightbulb I think your right..

    Quote Originally Posted by nocheepgas View Post
    I know I've seen them welded, the axle tubes are typically plug welded to the center sections. I believe the center sections (diff) are cast steel, and not cast iron and as such probably are very weldable. If you're going to TIG it I'd probably try "missile rod" which is great at mixed metals.
    Nocheepgas, I think your right, sorry!
    I know their cast, I just assumed they were cast iron.
    So, if it's cast steel, could it be Mig welded ?
    I don't have a Tig, yet.
    Thanks Jon

  7. #7
    Join Date
    Jan 2007
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    Midland, Mi.
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    Default

    The center section is NOT cast steel! It is cast iron.

  8. #8
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    Nov 2008
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    Roy, UT
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    Default

    so.....can they be welded?
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  9. #9
    Join Date
    Jan 2007
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    Midland, Mi.
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    Default

    Quote Originally Posted by bamacpl View Post
    so.....can they be welded?

    Yes.

    I warm the center section up a bit with the O/A torch, weld with nickle rod, then wrap it up in a welding blanket until it cools. Never any problems.

    Small non-critical stuff, I have migged without any problems, but I wouldn't chance a truss.

  10. #10
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    Jan 2009
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    Oregon
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    Default

    Quote Originally Posted by TS-Off-Road View Post
    Yes.

    I warm the center section up a bit with the O/A torch, weld with nickle rod, then wrap it up in a welding blanket until it cools. Never any problems.

    Small non-critical stuff, I have migged without any problems, but I wouldn't chance a truss.
    TS, I think I'll bag it and try and work around the pumpkin, challenge my brain ya know
    Thanks all
    Jon

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