This is the fusing process I use for Argentium Sterling granules.
The steel sheet is from the hardware store and in the thinnest gauge
I could buy so that it could be cut with shears. The sheet is
approximately 12" X 24" and is about 1.5mm thick, if I recall
correctly about 22-gauge in steel sheet measurements. This steel
sheet is called "welding sheet" because it is not galvanized.
Cut 1 1/2" X 1 1/2" squares of steel sheet. Glue one granule unit
design to each square. As each design unit is done, place it on an
old (level) solderite pad until you have 4-6 squares. Allow to dry.
Darken the room so you can see the fusing. Use a small torch flame.
Fire each square until the granules are red hot (the steel sheet
also will be red hot) and you can see a small amount of liquid silver
on the tops of the granules. Move the flame across the granules. Hold
the heat for a second or two at this high heat (this might vary
depending on the torch). After firing, move the square to a cold
steel block. When the steel sheet cools, the granule unit releases
from the sheet. When all are fired and cooled, check each design
unit to make sure the fuse is solid. With magnification, you want to
see a small bridge of metal fuse between each touching granule (and
the wire, if any). If you cannot see this bridge, wet with the glue
mixture and re-fire the design right away. Try to avoid over-firing
because you will lose granule definition. Do not pickle until after
all the design units have been fused to a back piece. Just before
final placement, lightly sand the underside of the granule unit with
600-grit sandpaper and more aggressively sand the surface of the back
piece with 400-grit paper. If the back piece is thicker than
26-gauge, cut a steel sheet back piece for the back piece to prevent
slumping or overheating. For example, on the 18-gauge (1/4" wide)
bracelet, I cut a 1" strip of steel sheet to conform to the inside of
After each use, clean the steel sheet squares with a steel wire
brush on the flex-shaft and store in a plastic bag to prevent rust.
I hope this answers your questions.