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user137289
user137289

There is vacuum welding: https://en.wikipedia.org/wiki/Vacuum_cementing

That happens when really clean iron surfaces touch. But it cannot happen in air. Then surfaces are covered with a layer of oxides, hydroxides, adsorbed water, carbon dioxide, carbohydrates and other organics and other crud.

There is vacuum welding: https://en.wikipedia.org/wiki/Vacuum_cementing

That happens when really clean iron surfaces touch. But it cannot happen in air. Then surfaces are covered with a layer of adsorbed water, carbon dioxide, carbohydrates and other organics and other crud.

There is vacuum welding: https://en.wikipedia.org/wiki/Vacuum_cementing

That happens when really clean iron surfaces touch. But it cannot happen in air. Then surfaces are covered with a layer of oxides, hydroxides, adsorbed water, carbon dioxide, carbohydrates and other organics and other crud.

Source Link
user137289
user137289

There is vacuum welding: https://en.wikipedia.org/wiki/Vacuum_cementing

That happens when really clean iron surfaces touch. But it cannot happen in air. Then surfaces are covered with a layer of adsorbed water, carbon dioxide, carbohydrates and other organics and other crud.