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broken frame Iron Horse MKIII

Discussion in 'Downhill & Freeride' started by swimfanswimfan, Nov 24, 2012.

  1. swimfanswimfan

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    I welding my broken frame 2 times,
    frame broke after 5 ride.
    Is it special method to welding this part? I don't why this frame broken in this place? DSCF3537.JPG DSCF3925.JPG DSCF3939.JPG iron horse.JPG
     

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  2. Huck Banzai

    Huck Banzai Turbo Monkey

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    Ive always been told that once aluminum breaks - done; barring a whole lot of gusset work, time to look for a new ride.

    Glad to be proven wrong tho.
     
  3. wiscodh

    wiscodh Monkey

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    beacuse you need to heat treat it. Its still soft after you weld.
     
  4. blackohio

    blackohio Generous jaywalker

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    psssh engineering nerdspeak.
     
  5. wiscodh

    wiscodh Monkey

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    go paint something
     
  6. blackohio

    blackohio Generous jaywalker

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    ima paint yo lips son with a right that'll push in your fronts.
     
  7. dilzy

    dilzy Monkey

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    You need to provide some gussetting. What's happening is the frame stiffness at the weld junction is increased dramatically, concentrating all the stress right at the weld heat affected zone, so you need to provide some triangular gussets that provide an increase in stiffness gradually towards the joint.

    It is perfectly possible to make it work and never break again. I've gusseted and welded my 06' spec enduro non-drive side chain stay after breaking the original, then the new one with the specialized gusset in the wrong place and after that cracked, now it's holding fine after almost a year.
     
  8. bengxe

    bengxe Monkey

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    You mostly hear about cracked rear triangles on those bikes, it should be easy to find an un-cracked front triangle.
     
  9. swimfanswimfan

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    I think,frame broken because i'll push rear
     
  10. dilzy

    dilzy Monkey

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    Haven't you got some Evil cock to suck?
     
  11. Da Peach

    Da Peach Outwitted by a rodent

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    This is a good point. I bet there must by a ton of fronts to be had...

    I've managed to not break mine yet... *knocks wood*

    They're great bikes.
     
  12. blackohio

    blackohio Generous jaywalker

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    Im a multi-tasker, are you done being made to look like a gigantic blubbering idiot in the V10 thread already? Trying to look like an asshole everywhere huh?
     
  13. dilzy

    dilzy Monkey

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    You mean done with a perfectly civil exchange in the v10 thread? No I'm probably not. Not sure how it makes me a giant blubbering idiot arsehole, but I'm sure you would know.
     
  14. swimfanswimfan

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    DSCF3537.JPG
    I don't know, mayby 2 parts are made from another material???
    This place where frame broken in my iron horse is strange :/
    I weight 200 lbs,mayby it is reason that frame broken?
     
    #14 -   Nov 26, 2012
    Last edited: Nov 26, 2012
  15. IH8Rice

    IH8Rice I'm Mr. Negative! I Fail!

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    iirc, they were cast iron
     
  16. wiscodh

    wiscodh Monkey

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    yeah, i think they came from the same factory in madagascar as empire frames
     
  17. dilzy

    dilzy Monkey

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    This poor dude is going to seriously think that it's cast iron...It's not swimfan, it's all aluminium, the bit your pointing to is just billet machined or forged then finish machined, not sure which.

    Either way, it cracked due to the reasons I mentioned. In every case I've seen, welded tubing like that cracks at the edge of the heat affected zone.
     
  18. Da Peach

    Da Peach Outwitted by a rodent

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    Maybe its because you installed your shock upside down!
     
  19. swimfanswimfan

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    ??? I bought from randallscott ->http://www.rscycle.com/ , shock was installed upside down,
     
  20. blackohio

    blackohio Generous jaywalker

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    Does it have the ironhorse shock sock still on it. That's how you can tell if its installed correctly. The problem with welding aluminum to cast iron is you have to get the panametric bearing properly align along the hydrocoptic marzelvein so that you essentially eliminate side fumbling during dual synching of the phase detractors. ****s not easy. Not even for trained welders.
     
  21. dilzy

    dilzy Monkey

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    That's the way, be a dick to a guy for whom English is obviously a 2nd language. 'k'n oath and you think I'm a blathering idiot.
     
  22. slimshady

    slimshady ¡Mira, una ardilla!

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    Happened to me too about six months ago. First the rear triangle cracked at the usual spot (in the rear triangle, where the right chainstay meets the vertical tube), and then at the very same spot as yours. A competent welder has fixed mine, previously heating the zone to prevent any stress damages. He also heat-treated the zone after welding it (not the whole front triangle, which should have been the right thing to to, but we weren't unable to do it for obvious reasons).

    As I said, so far it's been hanging on... But I don't know how long it will last.

    When the first crack appeared, I started searching online for similar cases, and stumbled upon a thread on MTBR where a guy who used to work for IH detailed failures every frame would show, due to improper welding or poor QC. This was because IH changed many times their frame suppliers in the last three years of its existence. Sadly, I couldn't find that thread again. It would have been useful, since you could mix and match front and rear triangles from different years to try to get a solid combination...
     
    #22 -   Nov 27, 2012
    Last edited: Nov 27, 2012
  23. swimfanswimfan

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    have you got any pictures (rear triangle cracked )
     
  24. wiscodh

    wiscodh Monkey

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    hey buckshot. He obviously didnt listen to me when i told him his re weld failed beacuse there is no treatment to the weld area.

    Even if his engrish isnt steller, when he disregards correct info, im going to go off on a tangent and be a wanker.

    I think it might be carbon fiber. You should really lay off the east coast rox. I hear if you do the hand flex test you can find out really quickly.
     
  25. blackohio

    blackohio Generous jaywalker

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    Roger you just don't understand what it means to be part of a community. re-re-weld ftw.
     
  26. ldw222

    ldw222 Monkey

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    this picture isn't from my frame but i cracked mine a little while ago, asked around, and a guy on here sent me this... Gusset.jpg

    i didn't try it yet...i just bought another mkiii on pinkbike and am going to get the old one welded after i get the new one together.
     
    #26 -   Nov 28, 2012
    Last edited: Nov 28, 2012
  27. slimshady

    slimshady ¡Mira, una ardilla!

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    That doesn't work. The vertical tube is butted, meaning the wall gets thinner as you go far from the weld, so it will eventually crack right after the gusset... The one in this picture was re-welded two times, each one with bigger gussets...



    EDIT: I just found the thread on MTBR I mentioned before, where a former employee details the welding failures for each model.
     
    #27 -   Nov 28, 2012
    Last edited: Nov 28, 2012
  28. swimfanswimfan

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    @slimshady, ldw222
    thanks for pictures