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Is it true that if two pieces of metal touch in space

  1. Aug 20, 2014 #1
    they are permanently stuck?
     
  2. jcsd
  3. Aug 20, 2014 #2

    Nugatory

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    Staff: Mentor

    Yes, if the vacuum is hard enough and the surfaces are clean and smooth enough and we bring them together in the right way. Google for "cold welding"
     
    Last edited: Aug 20, 2014
  4. Aug 20, 2014 #3

    AlephZero

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    If the right situation you don't need a vacuum or even special cleaning for cold welding.

    https://www.youtube.com/watch?v=8SSOKppwpAE

    This was a standard method for assembling electronic circuits, until surface-mount components killed it. Some pictures here: http://en.wikipedia.org/wiki/Wire_wrap
     
  5. Aug 21, 2014 #4
    http://en.wikipedia.org/wiki/Cold_welding
     
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