I am considering purchasing a Sparkie II to weld jump rings that
are 10 - 16 gauge thick.
The Sparkie II is designed for fusion findings only. In other words
it will weld only findings such as posts, tie tacks, etc. that are
designed specifically for use with the Sparkie. What you need is a
pulse arc welder such as a PUK III or 2, but keep in mind silver is
a very tricky metal to weld.
Rio Grande Technical Support
505-839-3000 ex 13903