Scandium International Mining Corp (SCY)

[TMLonggun]

As far as I know they would use standard aluminum welding techniques only to a much greater effect. The Sc alloy has greater plasticity and weld strength. I would guess that abundant scandium would make welding aluminum a more common practice since I know it is a finicky metal to work with.

http://www.lincolnelectric.com/en-us/support/welding-how-to/Pages/guide-aluminum-welding-detail.aspx

As for rolling out a large amount of scandium aluminum alloy I doubt they (aluminum manufacturers) need large scale modifications since the machinery I've seen looks really heavy duty. The rollers are huge and the material would only get thinner to meet the same strength requirements.