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@.gaz.
From what I understand (hearsay) they shouldn't be chemically fused, but rather the oxidisation "grows" in the tiny gap between post and tube, thereby creating a similar effect to an expansion bolt in a stem. This locks the post in place, but (in theory) only by the force of the expansion (not to be underestimated), so that cutting it (and thus relieving this pressure) should work.
Correct me if I'm wrong, of course; I think the world could use a definitive answer to this...
...mdcc_tester?