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  1. #1
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

    Default What makes a stronger brazing joint

    What makes a stronger joint..

    Silver soldering rods or bronze rods?

    I am trying to braze some carbide onto some steel and the silver soldering rods are simply not sticking, even though I have flux and both parts are impeccably clean, straight off the grinder..

    So I tried some Tobin bronze rods I had and it sticks like baby poo to a blanket..

    But which makes the stronger joint if done properly?

  2. #2
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    6,446

    Default

    RC.
    Can it be the surface coating on the carbide that is causing you grief?

    I can remember using 245 blue tip on carbide tool to the the tool holders for fitters in the past with no trouble. Perhaps if its a titanium coating it may not be compatible with silver solder. If its a coated piece consider a light grind to remove the surface coating.

    As far as brazing proper is concerned, I think I recall seeing somewhere on the net that the commercially available brazed carbide unit were induction brazed using maganese bronze. On other applications maganese bronze has a better strength.

    Just some thoughts

    Grahame

  3. #3
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

    Default

    Dunno what the problem was Graham.... The silver solder would either stick to the steel on some parts and the carbide on others...

  4. #4
    Join Date
    Feb 2010
    Location
    New england NSW
    Posts
    10

    Default Bronze or silver solder

    Bronze will give a lot stronger joint than silver solder. You will need quite a bit more heat to form the joint with bronze than silver solder. Get the rod hot and dip it in the flux then bring it over the joint and bring the 2 pieces to cheery red heat the joint should form at this time.
    Rowley.

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