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Metallic surfaces touching in the vacuum can stick to each other and fuse. This is known as the "cold welding" and it seems to be a possible issue in space if it happens where it should not. It was discussed for example in this paper from ESA which summarizes the tests of the cold welding phenomena under various conditions and concludes that it can be a problem in space.

I would like to know whether there are some specific examples how this is prevented in spacecraft design. For example the ISS Solar Array Rotary Joints (SARJ) have fairly large rotating metallic areas exposed to the vacuum. Are there any countermeasures implemented in the SARJ against the cold welding?

There are also other moving devices on the ISS: Canadarm2, Dextre, Mobile Base System, Heat Rejection System Radiators, etc. Was it necessary to take the cold welding into account when some (or all) of these were manufactured?

Other spacecraft also have moving parts: the Space Shuttle had the payload bay doors, space probes carry solar arrays and deployable high-gain antennas, etc.