I recommend that you check with your solder supplier as to the
actual melting point of your 18k solder. You might find, as I have,
that the range of solders in 18k has similar temps as the same
company's 14k solders, not too dissimilar, at least.
solidus - liquidus
18ky med 1345 - 1480
14ky med 1345 - 1460
14ky easy 1305 - 1415
14k gold alloy seems to have a melting point of 1550F. That'll be
the liquidus, so remember that the solidus (when the metal starts to
change from partly liquid to fully solid) will be a little lower than
I've made spectacle frames in 14k using (my local brand) 18k
solders. Looks nice.
B r i a n A d a m
e y e g l a s s e s j e w e l l e r y
Auckland NEW ZEALAND