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Axle Truss ?

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  • Straightshot
    started a topic Axle Truss ?

    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

  • blazin454
    replied
    there is a site that has some pretty unreal builds.. it is www.evolutionmachine.com any questions you have on any type of rig build ups im sure you could get alot of help there as that is what they specialize in.. they are a shop out of calgary alberta and they do some amazing work there..

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  • TS-Off-Road
    replied
    Hey thanks, Walker.

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  • walker
    replied
    TS, don't take this as pro advise, as I don't regularly weld on rear housings and know just enough about rear axles to fix the ones I have. I am a welding contractor and have welded a few rear end pieces together though. So long as your mig is welding it without porosity then you should be able to get away with mig. If you are getting porosity then you can try going with a nickle rod. Either way you are likely to warp the housing if you are welding contiuosly across it. I am not sure if preheating the whole housing would lessen the warpage or not. If I was set on doing an axle truss from tube to tube across the center section I would likely tack the thing up as best I could, then bolt/clamp it down to my welding bench (with a dummy center section in it) with a slight extra force in the opposite direction that the welds are going to pull it out. Then skip weld (1" welds moving around the perimeter and allowing to cool completely between welds). Afterwards you will likely needs to shirnk the opposite side with welds, or the torch and quench method, to straighten it back up.
    I hope I haven't muddied the water too much for you. There are likely a bunch of guys on this or other boards who do this regulary and you may want to post around a bit. My only point in the begining was that the center sections were not cast iron and could be welded with other processes.

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  • TS-Off-Road
    replied
    Originally posted by walker View Post
    Diffy housings are generally a nodular or ductile iron, definitley not run of the mill cast iron. As such they are weldable with MIG. TS, if you've welded small stuff without problem you'll have noticed this. When welding cast iron with MIG it behaves oddly (it seems to burn the cast away and leave you mig weld puddled in the middle, and is also porous) and you will not get fusion. With ductile/nodular, or cast steel the MIG welds have decent fusion and look just fine. If any body doubts this try weling up a known cast iron part (exhaust manifold, water pump housing etc), as soon as you do you'll KNOW the difference.
    Good info.

    To clear things up a little, can a truss be migged entirely to the (nodular) housing or for larger projects such as that,or should regular cast iron welding practices be followed?

    It would be nice to just mig it.

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  • bamacpl
    replied
    I messed around with it yesterday....used some 289 nickel rods. Seemed to weld ok,,,,, we'll se?

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  • walker
    replied
    Diffy housings are generally a nodular or ductile iron, definitley not run of the mill cast iron. As such they are weldable with MIG. TS, if you've welded small stuff without problem you'll have noticed this. When welding cast iron with MIG it behaves oddly (it seems to burn the cast away and leave you mig weld puddled in the middle, and is also porous) and you will not get fusion. With ductile/nodular, or cast steel the MIG welds have decent fusion and look just fine. If any body doubts this try weling up a known cast iron part (exhaust manifold, water pump housing etc), as soon as you do you'll KNOW the difference.

    Leave a comment:


  • bamacpl
    replied
    the link works fine for me?

    If you can't view it that way go to www.pirate4x4.com & go to the International Harvester forum & the title is:

    scout 4 link build

    Leave a comment:


  • Straightshot
    replied
    bamacpl, I'm just in the planning stages here.
    I will keep ya posted, I'm asking some questions at the local shops, we'll see what happens.
    Hey, I tried to click on that Pirate 4x4 link and it said "page couldn't display" don't know if it's just my laptop (I'm out of town) or if there was a problem with the link ?
    I'd be real interested in your project, if your willing to share, I'd love to see it.
    Thanks Jon

    Leave a comment:


  • bamacpl
    replied
    straightshot....LMK what you come up with, Im in the process of doing exactly what you're doing...I can even show you what I've come up with so far.


    http://www.pirate4x4.com/forum/showt...highlight=link

    Leave a comment:


  • Straightshot
    replied
    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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  • TS-Off-Road
    replied
    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.

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  • bamacpl
    replied
    so.....can they be welded?

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  • TS-Off-Road
    replied
    The center section is NOT cast steel! It is cast iron.

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  • Straightshot
    replied
    I think your right..

    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

    Leave a comment:

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