Advertise on Bikeforums.net



User Tag List

Results 1 to 5 of 5
  1. #1
    Domestic Domestique UnsafeAlpine's Avatar
    Join Date
    Dec 2007
    Location
    Michigan
    My Bikes
    Brand New Old Catamount! Schwinn Homegrown, Specialized FSR, Salsa Vaya, Salsa Chile Con Crosso
    Posts
    1,736
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Welding a tall bike.

    Sorry about the question. I'm sure it's been answered before but there only seems to be 5 threads in this forum.

    I've recently decided to try my hand at frankensteining some bikes and I'm wondering what the best way to attach all this stuff together. I have access to an oxy-acytelene welder but should I be looking into mig or tig welders? Is there a noticeable difference in strength? I'll likely be using bikes with gas bike frames and I don't know if heat treating is a concern or even if I should worry about it.

    Thanks.

  2. #2
    Randomhead
    Join Date
    Aug 2008
    Location
    Happy Valley, Pennsylvania
    Posts
    12,081
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    brazing with oxy/acetylene is a really good way to do things like this. If you were good at torch welding, that is ok, but I find it much harder than brazing. Tig could be considered ideal, but it's expensive and can have problems if the original bike was brazed.

    You have the default forum settings, you can show more threads by increasing the interval to show posts. Search will go back years, as the zombie thread problem demonstrates so well

  3. #3
    On a Mission from God FunkyStickman's Avatar
    Join Date
    Oct 2009
    Location
    Thibodaux, LA
    My Bikes
    Custom chopper, Surly LHT
    Posts
    1,990
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You will definitely want to check out some of the work being done at the Freakbike Nation forums.

    http://www.forum.freakbikenation.com/phpBB3/index.php

  4. #4
    Senior Member
    Join Date
    May 2005
    Location
    IL-USA
    Posts
    1,607
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by UnsafeAlpine View Post
    Sorry about the question. I'm sure it's been answered before but there only seems to be 5 threads in this forum.

    I've recently decided to try my hand at frankensteining some bikes and I'm wondering what the best way to attach all this stuff together. I have access to an oxy-acytelene welder but should I be looking into mig or tig welders?
    No need, a gas torch will do just fine--on steel. You may need to get a smaller heating tip, which only costs $15 or so.

    Aluminum can be torch-welded but it presents particular difficulties, no matter which kind of welder you have. (this is the reason there are far more custom-frame builders working in steel than aluminum)
    Is there a noticeable difference in strength? I'll likely be using bikes with gas bike frames and I don't know if heat treating is a concern or even if I should worry about it.

    Thanks.
    I assume you mean "bikes with gas pipe frames"? For casual-use stuff lots of people do use muffler pipe, electrical conduit or whatever. It is heavier than usual, and not very stiff tho'.

    If you want to build something nice and permanent, it's not much more money to buy the good tube, which is 4130 steel. There's places online to get it but look around for local metals supply places first, as they are probably cheaper. Get .049" wall for kids bikes, or .065" wall for adult-sized bikes if you don't know which to pick. The next-thickness-up is .080", which would make a very strong but rather heavy frame.

    Steel doesn't need to be heat-treated after welding; it re-hardens in a few days to nearly what it was before (-aluminum does require re-heat-treating, which is why I said to avoid it-).

    Also fillet-braze it with brass rod, don't weld. Welding thin steel causes a lot of metal on the back side to burn off. Brazing is at a much lower temperature and won't burn the steel at all.

  5. #5
    el padre
    Join Date
    Mar 2005
    Location
    Central Kansas
    My Bikes
    Linear,
    Posts
    1,444
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My question to you would be...do you know how to use the equipment... the wire feed welders are easier to learn, in my opinion... That is if you do not know much about welding. good luck, whatever you decide.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •