Theresa- Welding a sizing seam is a useful skill to have.
We always, when we can, weld a sizing seam rather than using solder.
It works best on 18kt and platinum.
I measure and remove the metal. Then I roll it out on my mill as
thin as it will go. I then use that super thin piece to weld my seam
old with a torch. it makes for an invisible seam that will not break
under the kind of stresses that the bottom of a shank is exposed to.
I take great pride in not thinning my sizing seams. I file the
inside first most of the way. Not all of the way. Then I round up if
ness on a mandrel. Just a couple of hammer strokes with a a rawhide
mallet. This also helps burnish the file marks on the inside of the
sizing seam so little or no emery is needed on the inside. Only then
do I file the out side of the ring. Now here’s the trick. I only file
70-80% of the way to smooth. Then I use emery to finish and then
polish as usual. If you file it smooth and then remove your file
marks with emery you thin the sizing area too much.
14 kt doesn’t weld as easily. For sizing 14 kt I will take 14 kt
hard solder and mix it half and half with 14 kt gold. Roll it out
thin and use that. For silver I use IT solder for sizing.
Have fun and make lots of jewelry.