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Vacuum cementing apparently is far more likely in space than on a planetary surface in atmosphere. How long must two surfaces be kept in contact with each other in a vacuum for vacuum weld/cementing to 'take'?

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I came to complain that "vacuum weld" (my preferred form) is more common that "vacuum cement", and Google Fight backs me up, but the difference is not statistically significant. –  dmckee Jul 19 '12 at 17:40
    
tic Were one to equate vacuum weld = vacuum cement ; after simplification the equation would be weld = cement. Google Fight puts the ratio cement:weld = 10600000: 4150000 or approximately more than 250% –  Everyone Jul 19 '12 at 17:52

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