1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar

    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


    User Avatar
    Science Advisor
    Homework Helper

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


    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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook