Can carbon fiber be welded?- Mtbr.com
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  1. #1
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    Can carbon fiber be welded?

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    P.S. This is the official carbon fiber welding thread.
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  2. #2
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    Quote Originally Posted by Sparticus View Post
    Asking for a friend. TIA.
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    P.S. This is the official carbon fiber welding thread.
    No.
    Carbon fiber is basically fiberglass.

  3. #3
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    Well sure.
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  4. #4
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    Epoxy and more carbon fiber? Although I'm not sure I'd want to be the test pilot on DIY carbon fiber repair.
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    Might smell kind of funky

  6. #6
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    Quote Originally Posted by Sparticus View Post
    Asking for a friend. TIA.
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    ftfy.


  7. #7
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    Says who!

    Can carbon fiber be welded?-diamondback-vertex....-1356ec788698.jpg


    OK, ok, I know it's not the carbon that welded... but still the sticker says it, so it must be true.
    All the gear and no idea.

  8. #8
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    OK, WTF? Is there some tricky stuff in here somewhere?
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  9. #9
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    This Tuesday thread needs pics of...

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    Tuesday Weld, who else?
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  10. #10
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    I exclusively ride Hard Enduro and only purchase weld-able carbon frames. I need to know that my bikes can be repaired in a pinch.

  11. #11
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    I think you just need to reverse polarity on your welder and use special gas...real special
    Makes ya feel good do it!

  12. #12
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    LOL

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  13. #13
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    Carbon wire feed and a resin catalyst inert gas?
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  14. #14
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    If you mean welded as in 'using electricity to heat the material and bond a filler to it,' no.

    If you mean welded in the more general sense of 'sticking two bits of shit together' then yes, you can stick two bits of carbon fibre together using epoxies such as JB Weld or Araldite etc etc. As an example if you busted a hole in a sheet of carbon fibre, you could "weld" a plate over the top of it using epoxies, but that's not really "welding." Stuff stuck to carbon fibre is likely to be less strong than traditional welds, as the epoxies are just glues whereas proper welding turns two pieces of metal into one.

    I wonder if there's some sort of glue that actually melts carbon fibre as it sets and effectively 'welds' two pieces together? If there isn't, there should be.. hmm

  15. #15
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    Quote Originally Posted by kameramandan View Post

    I wonder if there's some sort of glue that actually melts carbon fibre
    Then it would no longer be carbon fiber.
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  16. #16
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    Quote Originally Posted by Jayem View Post
    Then it would no longer be carbon fiber.
    So if I weld two pieces of aluminium together, those two pieces are no longer aluminium?

    If you're arguing that the introduction of a filler means the area around the join is no longer carbon, that's a silly pedantic argument and you might as well say my car's chassis is no longer steel because it's had a few welds

  17. #17
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    No.

  18. #18
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    https://en.wikipedia.org/wiki/Cabin_fever

    I believe this answers all the questions being arseked.

  19. #19
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    Quote Originally Posted by kameramandan View Post
    So if I weld two pieces of aluminium together, those two pieces are no longer aluminium?

    If you're arguing that the introduction of a filler means the area around the join is no longer carbon, that's a silly pedantic argument and you might as well say my car's chassis is no longer steel because it's had a few welds
    They way fibers work their magic due to their long aspect ratio. The longitudinal properties of that fiber are where the most attractive engineering properties of strength and stiffness run. Transverse properties are poorer by comparison. And if you cut that fiber, the ends discontinue those properties completely. As such joint design where two parts join is key. The resin matrix holds the fibers together and protects them.

    So if you have a cut or break..... glueing them back together is insufficient by itself and will be a weak failure point.

    You effectively can't weld them together as carbon itself has an extremely high temp range and doesn't liquify. It's not like you could align the thousands of tiny microfibers if you could. The resin matrix also doesn't play nice in the same range of temps.

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  20. #20
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    Can carbon fiber be welded?-61hipwb5exl._ac_sl1000_.jpg
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  21. #21
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    Quote Originally Posted by kameramandan View Post
    So if I weld two pieces of aluminium together, those two pieces are no longer aluminium?

    If you're arguing that the introduction of a filler means the area around the join is no longer carbon, that's a silly pedantic argument and you might as well say my car's chassis is no longer steel because it's had a few welds
    Dude, itís still carbon, but it ainít fiber.


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  22. #22
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    But of course carbon fiber can be wielded.
    Donít frail and blow if youíre going to Braille and Flow.

  23. #23
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    I canít leave you guys for a minute.
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  24. #24
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    What is it about human nature that allows one to seriously try to answer an obvious troll question?

  25. #25
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    I pretty sure you asking if it can be repaired. Yes it can and I have repaired my HED Carbon rims (low pressure/Rock strike) after fracturing the rim.

    Good friend of mine that works with Carbon fiber suggested that I use the attached repair get and it worked perfectly. I've logged a several thousand miles on the rim and never had an issue.

    Can carbon fiber be welded?-2015-09-22-mtb-farley-hed-carbon-repair-1-.jpg

    Can carbon fiber be welded?-2015-09-22-mtb-farley-hed-carbon-repair-2-.jpg
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  26. #26
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    Crazy glue! 1001 uses, now 1002!


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  27. #27
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    Quote Originally Posted by BlueCheesehead View Post
    What is it about human nature that allows one to seriously try to answer an obvious troll question?
    If we weren't in Off Camber, I'd rep you for that one!
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  28. #28
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    Trust the guy with the Camaro; yeah so he probably has a mullet, whatever.
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  29. #29
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    The pole sitter in the Dayton 500 sure looked like he had
    a mullet.

  30. #30
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    Quote Originally Posted by John Kuhl View Post
    The pole sitter in the Dayton 500 sure looked like he had
    a mullet.
    Donít all NASCRAPlians have mullets (except for Ricky Bobby)??? I thought it was part of the game.
    Donít frail and blow if youíre going to Braille and Flow.

  31. #31
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    Hell yeah! You just gotta have the right mask.

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  32. #32
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    It can only be bonded with the proper epoxy.

  33. #33
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    Every time I weld carbon fiber I end up with with diamonds...the pressure is just too much.

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    ..(edit) oops, wrong thread

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