I solder 16g 1/2 round using quick heat directed alongside the joint
rather than directly on the metal. The half round is 14/20 Kt G/F and
I place a snippet of 14KY gold medium solder just under the joint.
You might need to experiment to determine the right size of
flame, the grade and how much solder to use.
HTH Pam Chott Song of the Phoenix