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  • arcdawg
    replied
    this is by no means a bad weld.......... i really doubt that lincoln electric would pass that test piece if the joint wasnt safe.......

    i will be posting more pics....soon

    dawg

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  • KB Fabrications
    replied
    gregj66,
    Looked like a bike type joint to me as well. Before starting my own business, I used to weld bikes for Co-Motion Cycles. I've probably welded over 2000 different frames. We did some unscientific testing and the tubes would always bend or buckle away from the weld, never separate in the HAZ like that.

    Leave a comment:


  • gregj66
    replied
    Kevin,
    That was my concern. It looked like a mountain bike or motorcycle top tube to a head tube style of joint. Failure in that area would be castaustrophic.

    I learned what HAZ is today

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  • arcdawg
    replied
    james, sorry for confusing you..... i myself am kind of confused

    when i did this c.m. bend test they said that if it breaks at the weld or in the weld it would fail........if it breaks outside the weld it is good

    but now i too have questions about the haz

    WE WILL FIGURE IT OUT !

    dawg

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  • KB Fabrications
    replied
    James,
    You are right to be concerned. If the weld fails in the HAZ then it is a bad thing. That being said, maybe they were just trying to get the students to understand the strength of the actual weld.

    At any rate, a weld failing in the HAZ would be considered unacceptable. If you were building a dune buggy frame (that you or a customer would ride in) you would not want a failure in a weld or your corresponding HAZ. If it does fail in the HAZ, the metal was either problematic to begin with or it wasn't welded properly.

    Hope that helps.

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  • fun4now
    replied
    weld looks great

    ummm i dont think that anserd my ???
    i did'nt say yours was bad i get it that it will break eventionaly and i get that the weld should bee the strongest point

    but was i right or rong about the heat thing?

    ummm too much heat is bad right ? rong?

    do you need to find a happy meadeum to inshure a good weld without getting too hot ?

    or do you just have to make shoure it's not too cold to get good fusion?


    sorry i think you just confused me even more LOL

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  • arcdawg
    replied
    james....no offense taken

    the reason why i wanted to post those pics is for feedback and for people to see my skill level

    when i attendened reds class they had a c.m bend test......and what you do is you fishmouth or NOTCH a piece then tack it then weld it all the way around......

    it took me a few times to get it between running to hot or too cold or what ever it was

    know when you are done welding the c.m you weld in a threaded bung and you thread it into the hydrlic bender.....crank up the psi and if it goes past a certain point (i think 5000psi) you pass

    the whole point of this rambling is that the metal it self broke not the weld

    well thats what they told me

    dawg

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  • fun4now
    replied
    i'm new at this so dont take it the rong way cuz i dont know and am asking noy telling
    that being said

    it would seem that you should need to be concerned with what efect your weld dose to the surounding metal.
    ie if you weld too hot and cool to fast you would crack or atleast weeken the surounding metal making a week point so it wouldnt matter how strong your weld was if you just trashed the property's of the steel around it .


    yes
    no
    maybee

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  • arcdawg
    replied
    it is quite possible that it did break on the edge of the h.a.z but the purpose of bend test is to ensure the strenght of the actual weld bead........

    dawg

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  • gregj66
    replied
    That weld looks like it broke right at the heat line visible in the first picture. Is that normal?

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  • HAWK
    replied
    I guess that's what red can do for you?

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  • Paul Seaman
    replied
    Dawg:
    If I get that good I'll post some pics but for now, Nice stuff.
    Keep on keepin on,

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  • fun4now
    replied
    no problem dawg

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  • arcdawg
    replied
    #1 PIC is chrome moly bend test (notice how the metal broke and not the weld)

    #2 pic is the bead on the chrome moly. (er-70s) around 70 amps

    #3 pic stainless steel (fusion)

    #4 pic aluminum lap joint

    dawg

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  • arcdawg
    replied
    thanks a bunch james !!!

    dawg

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