Okay, I'm a little nervous about answering a technique question
here, since I'm not nearly as advanced in metalsmithing as most of
Fusing Argentium works really well - in fact, whenever I can use a
fused join instead of a soldered join, that's how I do it now.
In my experience, a tiny bit of Batterns flux at the join helps the
Argentium flow together. Fusing jump rings is really easy - I just
set up a bunch of them on a soldering block, spray some flux on the
block, and start fusing. I probably end up using more flux than is
really necessary that way, but it's easier than having to dab it on
each join individually if you are doing a whole bunch of rings. Any
flux residue left on the rings will pickle off.