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  1. #1
    Join Date
    Aug 2010
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    Horsham Victoria
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    Default Thermocouple welder

    Wondering if anyone has a thermocouple welder or a mini spot welder etc that would do the same job

    This is fory brother in law. Not sure what his budget is but said I'd put it out there for him

    Dave TTC
    Turning Wood Into Art

  2. #2
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    Near Bendigo, Victoria, AUS
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    Default

    There are two people in Horsham who can do that for you: their names are Peter Hart and Jayson..... both are on this forum.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  3. #3
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    Horsham Victoria
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    Default

    Thanks Joe,

    My brother in law wants to buy one but if someone could help him out he is actually in Helensburgh, Sydney. Not far from Chris Parkes.

    Sent you a text message the other day. Did you get it?

    Dave TTC
    Turning Wood Into Art

  4. #4
    Join Date
    Nov 2012
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    Sydney
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    Default

    Dave

    If you're looking to join K type, you can just twist the wires and then silver solder

    John

  5. #5
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    Horsham Victoria
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    Default

    Hi John

    This is for my brother-in-law. Not sure exactly what he wants to do but will ask him.

    Thx

    Dave TTC
    Turning Wood Into Art

  6. #6
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    Hinchinbrook
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    Default

    Dont do this
    Quote Originally Posted by jcge View Post
    just twist the wires and then silver solder
    You can generate false readings.
    They arent that difficult to just weld with oxy/acet. In a previous life I used to make large numbers of thermocouples as part of my job. If your B-I-L wants a bit of instruction I am happy to write it up

    Cheers Phil

  7. #7
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    Default

    Quote Originally Posted by 12bolts View Post
    Dont do thisYou can generate false readings.
    They arent that difficult to just weld with oxy/acet. In a previous life I used to make large numbers of thermocouples as part of my job. If your B-I-L wants a bit of instruction I am happy to write it up

    Cheers Phil
    That would be great Phil

    Dave TTC
    Turning Wood Into Art

  8. #8
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    Default

    Dave,
    Ask the B-I-L if he is using plain open wire TC's or sheathed.

    Cheers Phil

  9. #9
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    Default

    Will do

    Dave TTC
    Turning Wood Into Art

  10. #10
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    Default

    This is the two pics he sent





    Hope that helps

    Dave TTC
    Turning Wood Into Art

  11. #11
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    Default

    Those look fusion welded.
    I would think that the ideal tool is a micro torch running a fuel gas (acetylene would best) and oxygen.
    Banggood.com currently offer such a torch and I bought one. It's a ripper.

    Sent from my InFocus M808 using Tapatalk
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  12. #12
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    Default

    Could you post a link for me to send to the BIL

    Dave TTC
    Turning Wood Into Art

  13. #13
    Join Date
    Jan 2012
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    Hinchinbrook
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    Default

    Hi Dave,
    Thats just a plain K type T/C
    Step by step for the B-I-L. Unfortunately I didnt have any similar T/C on hand, but I did have some compensating lead, which is basically the same thing but with different, (lower rated), insulation. He may have teflon or fibreglass insulation but its the same method.
    comp cable.png
    So this is what I used. It still has the same chromel alumel metals as the T/C itself.

    IMG_0276.JPGIMG_0277.JPG
    1 Strip back about 30 mm of the sheath insulation, and if he has a shield wire make sure it gets snipped off and not mixed into the pair of wires. It must not short onto the T/C wires.

    IMG_0278.JPGIMG_0279.JPG
    2 Strip about 20 mm of each individual wire and give them a bit of light going over with emery to remove any oxidation.

    IMG_0280.JPGIMG_0281.JPGIMG_0282.JPGIMG_0283.JPG
    3 Cross the wires at an angle, and with a pair of pointy nose pliers grip them where they cross. Now with a pair of combination pliers grip the 2 ends (in line) and twist the wires tightly.

    IMG_0284.JPGIMG_0288.JPGIMG_0289.JPG
    4 Snip them back to about 10 mm and secure the T/C in a vise vertically. Apply a sprinkle of flux, (just bog standard pink brazing flux is fine) to the cold wires.

    carburizing.JPGneutral.JPG
    You dont want a carburizing or neutral flame.

    oxidizing.JPGIMG_0294.JPG
    5 With the smallest tip he has, (probably a #8, but a #6 is better) set the flame to a soft neutral and then bring it up to slightly oxidizing. (This provides a better pin point to the flame and cools it slightly) It should sort of whistle a bit. Apply a small amount of heat and sprinkle a little more flux onto the joint.

    Unfortunately the camera couldnt cope with the welding step so you only get to see the finished result but hopefully the explanation is clear enough.

    IMG_0295.JPGIMG_0297.JPG
    6 With the torch held horizontally, about 20 mm above the wires, position the torch so the tip of the blue flame will be just touching the weld point when it is lowered into position. Now just smoothly lower your hand, keeping the torch tip horizontal, and the wires should fuse almost instantly into a neat ball. This really only takes less than a second. Dont dwell or you may cut the wires.

    Cheers Phil

  14. #14
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    Default

    Quote Originally Posted by jhovel View Post
    Those look fusion welded.
    T/C are always fusion welded. Any inclusions of other dissimilar metals will generate false readings

    Cheers Phil

  15. #15
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    Default

    Just found out the type my BIL used are T type. Excuse my ignorance as I dont know what that means

    Dave TTC
    Turning Wood Into Art

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