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@Toulouse
Embarrasingly, I've a degree in Materials science. Ha Ha. But hey, it was dual honours. And a long time ago. Somewhere in my basement are my lecture notes. Maybe I should go have a look and see if there are any on camagnolo manufacturing methods..
AlexB is right that heating up a bit of metal changes it's microstructural properties. Which may or may not be a problem depending on the specific manuafacturing methods and what the makers were trying to achieve with the microstructure.
Any alloy "product" (steel, alu, whatever) will have been formed in a through a complex combination of heat treatments and mechanical processes to achieve different results according to the application. So whether it's "ok" to weld is not a simple question to answer, whether it's alu or steel or whatever. But heck, I'm not trying to get Concorde to fly again..
I know, I'll cut the hub in half, polish the surface and photograph the microstructure using a microscope for you. I'm not busy this afternoon. And I'm sure everyone is utterly fascinated.
Or I might just go get a sarnie for lunch instead.