Jet work - taking a microscope to it

Discussion in 'Fettling Forum' started by presscall, Mar 9, 2020.

  1. JP2

    JP2 Subscriber

    Offline
    Joined:
    Jun 26, 2018
    Messages:
    611
    Location:
    Canada
    Always interesting those tests
    Thanks for sharing
     
  2. Rangie

    Rangie Subscriber

    Offline
    Joined:
    Jul 25, 2012
    Messages:
    1,520
    Location:
    Caithness, Far North of Scotland
    @presscall That's so bloody cool John.
    You can see the nice fit and just see the braze.

    If you had the patience of a saint you could polish it up with 1000 or 2000 grit and see the braze wicking into the parent metal. I'm always fascinated seeing these types of interactions. Sections and grain structures are also amazing to see.

    Alec.
     
  3. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

    Offline
    Joined:
    Aug 25, 2009
    Messages:
    9,385
    I’ll give that a go Alec. You’ve got me intrigued with what might appear.

    John
     
  4. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

    Offline
    Joined:
    Aug 25, 2009
    Messages:
    9,385
    @Rangie
    I used polishing compound on a Dremel polishing drum.

    102X magnification.

    BE35AD23-2CE0-49B1-8B59-5D68B9D25516.jpeg


    455X magnification. Evidence of the silbraze ‘wicking’ visible on the lower boundary area, particularly a section in the bottom left area, where the molten braze metal has penetrated micro-pits/troughs in the brass. Predictably, any such pits/troughs in the surface of the surgical steel are too small to see at this magnification. Reassuring if that was to be a hypodermic needle used as intended!

    F3BB1B1C-2109-4291-B015-1EC46B913B7A.jpeg

    John
     
    Last edited: Mar 12, 2020