Page 1 of 2 12 LastLast
Results 1 to 10 of 11

Thread: Double pouring a single casting.

  1. #1

    Double pouring a single casting.

    I have just begun casting aluminum and I want to cast some larger pieces that require more material than my largest crucible can hold. My question is whether or not I can double pour a single casting and would there be a separation or weak bond between the two pours. Thanks for any information that can be provided.

  2. #2
    Senior Member Wolfcreek-Steve's Avatar
    Join Date
    Apr 2014
    Location
    Central Wisconsin
    Posts
    1,160
    Absolutely will be a joint with little to no bond.
    What is that squeaking noise?

  3. #3
    Time for a bigger crucible/furnace.
    WWW.TheHomeFoundry.org
    https://www.youtube.com/user/jagboy69
    Visit me: WWW.HandcraftedLanterns.com
    "Sometimes by losing a battle you find a new way to win the war"
    -- Donald Trump --

  4. #4
    Might you be able to strategically separate the design so that you could pour it in two parts, then have them TIG welded together?

    Roger

  5. #5
    Forget about this. Molten metal will not 'weld' automatically to cold metal, unless you preheat it strongly.

    Welding however rails works this way, but the rail butts which have to be welded together are strongly preheated to 1000 C and the liquid steel is much hotter (2500 C) than the melting point of iron (1530 C) due to the immense heat of the thermite reaction, resulting in a strong weld.

    In your case, as other say, order a larger crucible and / or build a larger furnace.

  6. #6
    Thermite welding! Cool process.
    WWW.TheHomeFoundry.org
    https://www.youtube.com/user/jagboy69
    Visit me: WWW.HandcraftedLanterns.com
    "Sometimes by losing a battle you find a new way to win the war"
    -- Donald Trump --

  7. #7
    Senior Member Robert's Avatar
    Join Date
    Sep 2008
    Location
    Charlotte, Nascarolina
    Posts
    3,016
    Are you guys sure? I think I have seen double pours done commercially.
    Robert
    "Whether you think that you can, or that you can't, you are usually right."
    - Henry Ford (1863-1947)

    Forklift Project
    Sand Mixer

  8. #8
    Senior Member Wolfcreek-Steve's Avatar
    Join Date
    Apr 2014
    Location
    Central Wisconsin
    Posts
    1,160
    In industry, pours are often made with multiple ladles, but always simultaneously.
    What is that squeaking noise?

  9. #9
    Quote Originally Posted by Wolfcreek-Steve View Post
    In industry, pours are often made with multiple ladles, but always simultaneously.
    Indeed, more ladles with steel are used at the same time as a source of metal, here a nice example of casting of a steel ring:

    https://www.youtube.com/watch?v=KdO8vuh3QpI

  10. #10
    Senior Member Spelter's Avatar
    Join Date
    Jan 2012
    Location
    Hudson shoreline
    Posts
    647
    There was a video of Nepali casters doing a double crucible pour I came across a few years ago. Two pouring teams, one feeder. As one crucible finished the next started pouring , with a slight overlap. It takes a talented, practiced team.
    The video may be linked from a discussion about ashanti style investment casting some years back.
    "The former lives of objects need not interfere with their current use."

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •