309 wire on motorcycle frame

  1. Reabo

    Reabo New Member

    Messages:
    13
    Location:
    London
    Assuming decent penetration etc will stainless 309 wire produce a strong enough weld for welding a motorcycle frame?
    Has anyone done it?
     
  2. premmington

    premmington Member

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    Problem with motorbike frames is cracking - 309 is good for dissimilar metals - I would go for A18 wire if it is a steel frame. Stainless may not be your friend here.

    Last one I did - I MIG brazed - headstock crack and few mounting tabs on the frame. It has lasted on the chaps old Honda XR.
     
  3. Reabo

    Reabo New Member

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    13
    Location:
    London
    A18 is my normal choice, I have a load of 309 which i am not using so am looking at ways of using it up.
     
  4. premmington

    premmington Member

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    I got two part rolls of 1.2mm 309 and 312 given to me. I been cutting lengths off them and using them to TIG weld with...
     
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  5. Reabo

    Reabo New Member

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    13
    Location:
    London
    There's a thought, learn to TIG with it.
     
  6. Reabo

    Reabo New Member

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    13
    Location:
    London
    The 309 has a tensile strength of 87ksi whilst A18 has 70ksi which is why I was considering it.
     
  7. Richard.

    Richard. Member

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    18,093
    Location:
    Cambridgeshire
    Don’t waste 309 on that to just use it up. That wire is wonderful stuff keep it for the right application
     
  8. Reabo

    Reabo New Member

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    13
    Location:
    London
    Waste?
    WASTE?
    we are talking custom motorcycle frames here, how could it be a waste?? Lol.
    It does give a luvverly weld and flows good too, which is why it would look good adorning a motorcycle frame.
     
  9. Richard.

    Richard. Member

    Messages:
    18,093
    Location:
    Cambridgeshire
    It’s irrelevant if it’s a custom motorcycle frame or a patch on an Astra wheel arch it’s a total waste to use a consumable like that on carbon steel not to mention the wrong consumable from a composition match POV. It might be fine it might crack.
     
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  10. Reabo

    Reabo New Member

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    13
    Location:
    London
    But the same can be said of any weld surely, it might crack.
    Are we talking hot cracking or cold cracking?
     
  11. Richard.

    Richard. Member

    Messages:
    18,093
    Location:
    Cambridgeshire
    Well no mate. Using a wire matched to the parent material heavily reduces the risks of problems. That’s the whole idea. Using stainless consumables on mild steel only (even over alloyed ones) can run the risk of a joint becoming martensite which is a very hard and brittle structure. If you want your frame to look nice then bronze weld or tig braze it.
     
  12. Liquid Metal

    Liquid Metal Member

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    433
    Location:
    Essex, UK
    Dont forget, the tensile strengths you quoted above are for the filler in its supplied state, not once welded.
    Also, a slightly lower tensile strength will give a little bit of flex. Ie what you want in a frame thats going to be subjected to current state of a lot of roads in this country now lol.

    Tacking carbon parts with 309 let alone welding them (even carbon to stainless ie its intended use), it can be a PITA for cracking.

    Unless your going to be dye pen testing all of the welding to make sure there arent any cracks at least 48hrs after all welding has been finished, id use 70s6 or 70s2. Or as mentioned above, silicon bronze.
     
  13. 123hotchef Member

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    8,125
    Location:
    Kent
    that stainless wire is good it the garden too ;-)
     
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  14. premmington

    premmington Member

    Messages:
    1,240
    Location:
    Norfolk

    I like MIG brazing or TIG brazing on motorbike frames. Plus you have added benefit of things not "walking" or pulling about when they cool.

    I don't think I would use 309 or 312 - I would be scared of cracking in use.

    The big point you made - is for fusion welding - matching the parent metal is the plan.
     
  15. AndersK Member

    Messages:
    619
    Location:
    Sweden
    If you have a load of filler you don't use, try sell it and buy the filler you actually have use for. A lot better option than risking your or someone else's life gambling on a critical part as a bike frame.

    I have watched with my own eyes the effect of a frame breaking under load, ripping of the entire fork. Two persons air lifted to hospital, don't know if they survived.
     
  16. Reabo

    Reabo New Member

    Messages:
    13
    Location:
    London
    Thanks for all your input guys, you have been really helpful.
     
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