Are foreign metals a welding issue?

Discussion in 'Motorized Bicycle Welding, Fabrication and Paintin' started by sofasurferlinux, Aug 2, 2009.

  1. sofasurferlinux

    sofasurferlinux New Member

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    When I was a youngster I would do some gas welding to replace rotted panels on my car. I got my sheet metal from old panels off other cars. At one time I used metal from an old English Ford (I think). Anyway, I found that you cannot weld unlike metals.
    Is this an issue when welding frames on bikes that come from who knows where?
     
  2. joewlms3

    joewlms3 New Member

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    steel should be steel
    its more likely an issue of the filler material (welding rods) being correct for the application or correct process

    you need a particular rod to weld stainless to carbon steel 309L

    there is no filler to put aluminum to steel with any kind of arc welding that i know of

    most "steel" bike frames are 4130 chrome moly
     
  3. joewlms3

    joewlms3 New Member

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    im pretty sure the 4130 alloy is used because its needed to be able to make the steel into tubing
     
  4. Maxvision

    Maxvision New Member

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    Silver flux coated brazing rods are da shnitz. Can braze stainless to steel if you like. Very strong stuff and flows like regular brass brazing rods.
     
  5. machiasmort

    machiasmort New Member

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    What are the numbers on those rods and where can I get them???

    Aluminum and steel differ in that there are ferrious and non ferrious metals. Ferrious are magnetic!!! Took a while for me to find the answer to that. They just don't mix well, even when moulten. Tin I believe is aluminum and steel, not sure of process to get them to bind?

    Your flame on your gas set up has allot to do with the carbon content your welding. A more actylene rich flame will put more carbon into your steel.
     
  6. spad4me

    spad4me New Member

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    FYI TIN
    Tin - Wikipedia, the free encyclopedia

    I have several wall mart bicycles that they claim are made of tensteel.
    Or other Chinese cheap steel.
    When they break I throw them away.

    When I build a recumbent I want an old schwinn , for a donor frame.
    The steel is American made from a time when that meant something.
    I will find a schwinn ( at a yard sale) with rotted tires, rusty chain, bent rims, torn seat .
    For the right one I ask "HOW MUCH."
    Seventy Five Dollars they say.
    I ll take it a say.
    SHHHH !!! sometimes it is Five dollars. Not seventy five dollars.
    TYhe local vender's don't understand why I will pay top dollar for some American made bicycles, and PASS on Wallmart junk.
     
    #6 spad4me, Aug 3, 2009
    Last edited: Aug 3, 2009
  7. Maxvision

    Maxvision New Member

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    Were you asking me?

    If you were, you can buy silver flux coated brazing rods at most hardware stores or Home Depot. They are the ones with the blue flux on them.
     
  8. 2door

    2door Moderator
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    The Schwinn Jaguar is a Chinese made bike. I've welded on them using both TIG and MIG. I've actually been impressed with the purity of the steel used in these bikes. If the steel is bad, or dirty, believe me, you'll know it when you try to use TIG. My experience is limited to the Schwinn bikes so I can't speak for the others. As for welding aluminum either with gas or electric, it is a process that requires some practice and not for the beginner. If the weld is at a structural point, let a professional do it unless you have mastered the art of aluminum welding.
    Tom
     
  9. Maxvision

    Maxvision New Member

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    You can weld aluminum with gas? Did you mean oxyacetylene or electric w/ gas atmosphere?
     
  10. 2door

    2door Moderator
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    Maxvision,
    Yes you can weld aluminum with oxy-acet. They did it long before heli-arc was around and I've seen some beautiful work done by people who know the process. As I said before, it's an art and takes practice to be proficient.
    Tom
     
  11. Maxvision

    Maxvision New Member

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    Well bust my britches! Have always heard it was impossible with gas set up.

    Just did a Bing.com search on welding aluminum. Found this EXCELLENT link: Welding Aluminum, with video demonstration how to do it. He made it look so easy, nothing fancy needed, tig welding rod, jar of flux and youre ready to go.

    Woohoo! I will go to bed smarter than when I woke up!
     
    #11 Maxvision, Aug 3, 2009
    Last edited: Aug 3, 2009
  12. Dcrac3r

    Dcrac3r New Member

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    my bikes fork snapped at 30mph yesterday, so I say screw china metal.:(
     

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