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Thread: Yes I know, overkill...

  1. #11
    KTMTalk Member altaholic's Avatar
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    Default Re: Yes I know, overkill...

    Quote Originally Posted by Caddyman View Post
    From what i been told chromoly should always be tig welded with mild steel , told by guys who build race cars , with full cages , stainless welds will be brittle, for a tab or bracket you may get away with it , but for a structural joint it is a no no to use stainless on chromoly
    clarification: I should have stated for non-structural stuff. Thatís my understanding as well.
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  3. #12
    KTMTalk Member gmoss's Avatar
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    Default Re: Yes I know, overkill...

    Nice. My son is about to get his welding certificate. Need to show him this...and pick up a welder. Haha
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  4. #13

    Default Re: Yes I know, overkill...

    Just to clarify the welding rod controversy. You do not need high strength weld rod just because the base metal like a frame is. Sure that special hard to find and very expensive MG600 is designed for that and much more serious applications. If ya got it use it. But the lowest strength mild steel is not only good enough but also preferred as it is ductile and more crack resistant than any higher grade stainless weld material. Mild steel wire does pick up some of the alloy from the high strength frame metal but just letting it slow cool good enough. I prefer to preheat both metals in place to a above boiling water temp. That flashes off any moisture and makes cool down a bit slower and does a lot of other technical stuff that's all good for the weld. If you feel you need a stronger weld than the one that broke make the new part longer in stead of making the weld bigger. You can even extend the weld farther along its axis beyond the length of the weld joint. Blending to remove any sharp corners helps prevent cracking. I use lincoln L50 for about everything for the last 50 years or as long as i have been welding and as long as it was available.
    Victor

  5. #14

    Default Re: Yes I know, overkill...

    Thanks all. It was a fun way to spend an afternoon!
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  6. #15

    Default Re: Yes I know, overkill...

    Bet that frame is welded with mild steel typical 70,000 psi rod /wire , from the factory

  7. #16
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    Default Re: Yes I know, overkill...

    Quote Originally Posted by Victor View Post
    Just to clarify the welding rod controversy. You do not need high strength weld rod just because the base metal like a frame is. Sure that special hard to find and very expensive MG600 is designed for that and much more serious applications. If ya got it use it. But the lowest strength mild steel is not only good enough but also preferred as it is ductile and more crack resistant than any higher grade stainless weld material. Mild steel wire does pick up some of the alloy from the high strength frame metal but just letting it slow cool good enough. I prefer to preheat both metals in place to a above boiling water temp. That flashes off any moisture and makes cool down a bit slower and does a lot of other technical stuff that's all good for the weld. If you feel you need a stronger weld than the one that broke make the new part longer in stead of making the weld bigger. You can even extend the weld farther along its axis beyond the length of the weld joint. Blending to remove any sharp corners helps prevent cracking. I use lincoln L50 for about everything for the last 50 years or as long as i have been welding and as long as it was available.
    ^^^^^
    Good Info! CJ
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  8. #17

    Default Re: Yes I know, overkill...

    MG600, not that hard to find, I live in NZ, engineeringly a third world and it's stocked on the shelf just in town where I live. I've manufactured Autogyro frames for years and used this MG600, never had a failure. Although as a back up I fully seal weld all components, run air pressure in them, with a small pressure guage keeping an eye on things. Idea being if you see a pressure drop in flight, land as there could well be a crack starting. In 25 years its never happened yet but doesn't hurt to keep an eye on things.
    I like my MG600😆.

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