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I recall there were cases of mechanisms of spacecraft that failed due to cold-welding, but are there any records of accidental cold-welding on EVA? of e.g. an ill-prepared tool cold-welding to a part of the spacecraft, or two parts astronauts worked on welding together accidentally, or similar mishaps?

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    $\begingroup$ If the contact area of cold weld is very small, a small force will break it. To get a cold weld resisting a large force, the contact area should be large. This would require clean, metallic, well aligned and polished surfaces with small roughness and the same shape. The probability of such surfaces getting contact should be small $\endgroup$ – Uwe Aug 30 '18 at 16:27
  • $\begingroup$ There have been a couple cases of parts being unexpectedly hard to remove but I don't remember it ever being attributed to cold-welding. $\endgroup$ – Organic Marble Aug 30 '18 at 16:28
  • $\begingroup$ @Uwe: or a hit sufficiently strong to make the surfaces aligned and contact area large. Providing they are clean. $\endgroup$ – SF. Aug 30 '18 at 16:28
  • $\begingroup$ This is one of the (many) reasons, for example, that all aluminum parts on orbit are either anodized or conversion-coated. $\endgroup$ – Tristan Aug 30 '18 at 17:48
  • $\begingroup$ Does cold welding work on those timescales? $\endgroup$ – Hobbes Aug 30 '18 at 19:44

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