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  1. #1
    Join Date
    Jun 2007
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    Default braze Tungsten tip

    Hello again Gurus,

    Finally I got the hang with HHS geometries. I just bought some Tungsten tips and wondering what is the best way to weld them into the metal piece? I have oxygen torch and silver rod but I am wondering if this methos is too hot and will it change the carbide properties?

    Also, the tips are triangle, should I weld the pointy bit to the front or the side of the trianle along the side of the metal piece? I don't know if I am making sense on this one or not?

    Thanks in advance
    Jackaroo

  2. #2
    Join Date
    Apr 2005
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    Japan。
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    Default

    The bits are triangle shaped, as in they should be clamped down so you can present a new tip to the work when one wears out?

    That's didn't read so well did it?

    Is the tungsten tip supposed to be brazed or is it supposed to be clamped to a tool bit?

    If clamped, you won't braze it with anything resembling success, unless it's ancient stuff.

    If brazed, then I doubt you will hurt the stuff with a bit of heat. If you try to cook it, you might hurt it, but otherwise I don't think the heat is going to worry tungsten too much.

  3. #3
    Join Date
    May 2005
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    Newcastle
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    Default

    They can be silver soldered without damage, make sure everything is spotless before you start, pointy bit to the front ,
    Better idea though is to buy a tool holder and use the provided screw to clamp them down that way you can quickly go to a new tip where as if you braze or silver solder them you need to go through the whole process to get to the next tip
    Ashore




    The trouble with life is there's no background music.

  4. #4
    Join Date
    Dec 2005
    Location
    South Australia
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    1,656

    Default

    As Ashore said

  5. #5
    Join Date
    Jun 2007
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    Default

    The tips I bought are very big and my toolpost only takes 5/8. These do not have the hole in the middle. I am guessing it is for the bigger tool holder?

    Anyway, I tried with oxygen torch before and it seems a bit hard, I had to heat it until red for the silver bond properly, I am not too sure if I have weaken the tip, I'll try it out on the lathe tomorrow and see if it will even be ok for Aluminum

    Jackaroo

  6. #6
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    May 2005
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    Default

    Mate for aluminium you are better off with a tip with negative rake, needing to get it red hot for silver solder indicates to me that it is a poor quality silver solder, did you use silver solder flux ?
    There are several types of holders a CTGP type is what you need Hare and forbes have them at about $ 70 each for left hand or right hand
    If you are worried about the center height you can have the bottom of the tool holder ground or cut down to suit your lathe at worst if you are good with a hacksaw and file you can do the job yourself and then you will have an easier to use tool holder with replaceable tips always at the correct centre height.

    In an earlier post I said the pointy bit to the front this is for general turning and taking a larger cut, larger surface area in contact with the steel easier on the tip and removing heat
    If you are making shoulder cuts then you need a to put the side to the job , though with most jobs you can turn the tool post to give the correct tool angle to the job
    Ashore




    The trouble with life is there's no background music.

  7. #7
    Join Date
    Nov 2006
    Location
    Heidelberg, Victoria
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    79
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    2,074

    Default

    Hi Jackaroo,

    What size tips do you have, ie, if they are triangular, what is the distance along each side, and how thick are they? You say there is no centre hole, that's ok.

    You are better off making your own tool holder, with a clamp to hold the tip in place.

    At least this way, you will be able to rotate the tip, and extend it's life by a factor of three.

    I made my own tool holder, easy peasy.

    Will submit snaps and a drawing very soon in my next mini lathe/mill project series.

    Ken

  8. #8
    Join Date
    Jun 2007
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    Default

    Thanks for the tips Ashore, I didn't think about cutting the tool holder down for a suitable high I will buy one to modify. Yeah I did use the flux but wasn't sure if I used the right type as my dad has a few bottles around. I'll double check tonight when I get there again.

    Neksmerj: The triangle tip is big, its wider than the 16mm piece I welded on so I am guessing the side on the triangle is 3/4 or so. I'll buy a proper holder for it and will tempt to make one as well just for the experience


    Jackaroo,

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