I worked with pewter or britania metal quite a bit as an undergrad.
There are several choices for attaching.
Fuse or weld the seam using the pewter itself. Fit your joint as you
wouldfor regular soldering. You will need some liquid flux that is
used for electronics. Make or buy some pewter wire the same gauge as
the metal. Flux the joint and using a small torch tip, melt or
puddle the area, stick feedingthe wire to prevent holes. Afterwards,
you can file, forge and planish theseam until it disappears.
Use a commercial solder called “Stay-Brite”, it can be purchased at
some hardware stores and welding suppliers. This is the best all
around choice. Draw or mill it smaller for more delicate areas. It
comes with it’s own flux “Stay-Clean”.
Bismuth, or Tin based solders are helpful for repairs or really low
Let me know if I can answer other questions.
Adjunct Associate Professor