Help anyone know a way to fuse aluminum and steel

Discussion in 'General Questions' started by prairie breeze, Aug 14, 2011.

  1. prairie breeze

    prairie breeze New Member

    I really want to build this chop but don't have any ideas for fusing the aluminum piece to the new steal bottom tube any advice?

    Attached Files:

  2. professor

    professor Active Member

    There is no such thing as fusing them together. Besides, you are better off using a steel frame.
  3. motorpsycho

    motorpsycho Active Member

    yes, it can be done by welding, but there are some very special techniques and materials that need to be used to get it done.
    you have to use bimetallic transition inserts or you have to coat the dissimilar materials prior to welding. this can be expensive.
    i would personally not use an aluminum frame for a m.b. and the expense to getting the steel welded to the aluminum would be more than trying to find an all steel frame already done, or 2 steel frames that you can cut up and weld together.

    (i got the following info from the web)

    Bimetallic transition materials are available commercially in combinations of aluminum to such other materials as steel, stainless steel and copper. These inserts are best described as sections of material that are comprised of one part aluminum with another material already bonded to the aluminum. The method used for bonding these dissimilar materials together, and thus forming the bimetallic transition.
    basically you get a peice that is 1/2 steel and 1/2 aluminum. you weld the steel end to the steel part and then weld the aluminum end to the aluminum part.

    A coating can be applied to steel to facilitate its arc welding to aluminum. One method is to coat the steel with aluminum. This is sometimes achieved by dip coating (hot dip aluminizing), or brazing the aluminum to the surface of the steel. Once coated, the steel member can be arc welded to the aluminum member, if care is taken to prevent the arc from impinging on the steel.
    Last edited: Aug 14, 2011
  4. prairie breeze

    prairie breeze New Member

    sounds like it can be done but at the cost i could buy a chop frame from one of the various online sites. lol
  5. wheelbender6

    wheelbender6 Well-Known Member

    KHS used to build a soft tail bike with an alum front triangle and steel rear triangle. The old Raleigh Technums and some of the Univega road bikes had a similar setup. They didn't provide a lot of details in how they did it.
  6. srdavo

    srdavo Active Member

    Hi. I like the lines of your potential frame.

    Tell me.... what part is (parts are) aluminum? All the Next bikes I have seen are steel.
  7. prairie breeze

    prairie breeze New Member

    the red part from the neck down is aluminum i think i figured a way i could bolt it together but i am afraid it will never have the strength.
  8. RedBaronX

    RedBaronX Member

    I have never done any welding or frame fabricating, but I would think that if you are going to do that much fabricating, you would be better off starting with all-steel.
  9. retromike3

    retromike3 Member

    TRaleigh Technium

    Back in the day I used to sell Raleigh Technium mountain bikes and they had some problems. Granted, the frame design was not really good for off road, but the main flaw I noted was that they felt "dead" and unresponsive.

    Something about them that did not work. They were fairly light for the time but they never "Jumped", they just sat there. The steel Mongooses I sold at the same time(back when mongoose was "hot" and not Walmart fair) were a bit heavier but a lot more fun to ride.

    I think you could bond steel and aluminum together, probably with carbon fiber "lugs" like they do with bamboo frames but I don't think it would achieve a bike that has the properties that you are looking for.

  10. Daeouse

    Daeouse Member

    I'd just get the all-steel one, as I personally am paranoid, and hate the thought of something breaking beneath me when placed under stress. But that's just me. . . ;D
  11. IbedaYank

    IbedaYank Member

    can also be done using couple hundred pounds of high explosive under quite a few tons of sand

    normaly used to make things like armor plate tho....
  12. Saddletramp

    Saddletramp Member

    If your not a world class welder don't try it. It can be done tho. For on road use only there is nothing wrong with a GOOD alumium frame. My Point Beach I built three years ago is still going strong. Ride it every single day. My DX-Al Mongoose with a rear mount 4 Stroke Is going strong also. I ride on smooth roads, check my bikes every day!
  13. IbedaYank

    IbedaYank Member

    you motor and a HT style frame shaker are 2 WAY different motors
    also rear mounting a motor takes the vibrations that the motor gives and moves them AWAY from the main tubes of the frame
  14. Saddletramp

    Saddletramp Member

    I build Mb's. I'm saying the frame will hold up if it's a frame mounted 2 stroke, or a rear mounted 4 stroke. Aluminum is stronger in some ways than steel. Steel is stronger than Alumium in some ways. I was giving an example. Your milage may be diffrent :)
  15. IbedaYank

    IbedaYank Member

    Saddle tramp

    seen to many pics of alloy frames on here that have broken in less than 3 months of being used with a china HT motor
    aluminum work hardens then cracks and your frame breaks from the vibrations

    if allow was stronger you could use alloy forks with a hub motor... without a trip to the er and false teeth after you try it

    HT motor... like a 20 pound concrete vibrator
  16. retromike3

    retromike3 Member

    question of fatigue life

    The problem with aluminum is that you can only stress it a certain number of times before it fails. Steel on the other hand under certain conditions as a unlimited fatigue life. If you take a steel tube and stress it a certain amount it it will always come back to the original shape. Aluminum does not share this quality. I was looking at a website called Wheels through Time and on that site was a 1912 Indian. Somehow a steel framed motorcycle seems to have lasted 100 years without failing. This looks like a pretty good testimonial for steel.