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Cold Welding

  1. Jun 29, 2014 #1
    Can someone explain the process?
     
    Last edited by a moderator: Jun 30, 2014
  2. jcsd
  3. Jun 29, 2014 #2

    UltrafastPED

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    See http://science.nasa.gov/science-news/science-at-nasa/2002/24oct_sunrings/

    It's easy to cold weld stuff together in vacuum chamber at 10^-8 torr; just clean everything well so that the metal is clean, put the parts in contact with some pressure, and leave them under vacuum for a few days.

    If they are made of the same alloy the may cold weld. The cleaner the quicker, and more pressure also helps.

    Too avoid this use aluminum; the surface oxidizes so quickly that you will always have a layer of aluminum oxide. Or use two different metals. Or spread a light coating of molbdenum disulfide between them ... dry moly.

    I've had this happen with my vacuum fixtures ... and learned my lessons! The article above has a good Feynman quote.
     
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