Brazing, cast manifold............

  1. lorenzo

    lorenzo Member

    Here was one of my recents projects...... braze a fresh water manifold off a tug boat...

    The problem..... A crack on one of the bolt flanges. The crack does not go all the way through the piece is still attached.
    [​IMG]

    First I sandblast the area and gouge the sides......
    [​IMG]

    By doing the sides first I can now use a cylinder type carbide bur and open up the crack on the inside without having to worry about breaking the flange completely off.... At the same time I open up the backside of the joints I just brazed, gouging into the filler material I just put in. This will ensure that I have 100% penatration. Then I braze it up......
    [​IMG]
    [​IMG]
    [​IMG]

    Looks like hell huh? Wait there's more..... okay time to clean it up...
    [​IMG]

    After cleaning the part I had to braze a layer of filler over the flange ear... when I placed a straight edge across all the flanges the one I brazed was not quite even with the others. Even though there is a gasket enough torque on the flange could cause it to break again. A little bit longer and.......
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]

    Another happy customer......
     
  2. MigTig

    MigTig Maintenance Welder

    Messages:
    302
    East Sussex
    Nice work!
    Always wanted a Die grinder.. my little 2hp compressor would never hack one though.
    I take it this Mig brazing? did you need to pre heat/cool in a specific way to prevent cracking?
     
  3. lorenzo

    lorenzo Member

    Die grinders are a good tool to have... but they do draw a lot of air. Did you know that they are available in eletric? I have a DeWalt and it works great.

    As for the Bazing...... nope conventional oxy/ acet brazing.... back to basics:laughing:

    I am proficient in many different types of welding
     
  4. lexi Member

    Messages:
    1,559
    paisley
    I know guys that have brazed manifolds. The main difference compared to that repair is the expansion and contracting with heat.

    Alex
     
Advertisements