Marie - I’ve had a good bit of luck with sweat soldering using
powdered solder. You apply white paste flux, let it dry, then
sprinkle the pieces to be soldered with the powdered solder, tapping
off the excess (do this all over a piece of baking parchment) Have
the flux on your back plate prepared with white flux, dried. Then
simply place the pieces where you want them, heating from under the
back plate. I haven’t had the parts move this way.
Another way is to “tin” the 3 parts with solder using minimal
solder, pickle and dry. Then place them on the back plate where you
want them. Put the whole assembly on an electric griddle, cold. Using
a hypodermic needle enabled yellow flux dispenser, put a small amount
at the edge of each piece just touching the backplate at the point
where the top piece sits.
Capillary action will take the flux under the three parts. Now
slowly, very slowly, bring up the temp of the griddle to about 200F.
Let the metal sit and dry for 10 to 15 minutes. Then use your torch
to heat the backplate and the solder will flow and the pieces will
White flux - Handy Flux Paste - from everybody
Yellow liquid flux - I use My-T-flux - Rio Grande
Liquid flux applicator - 504005 Rio Grande Needle tip flux dispenser
Parchment paper - http://www.ganoksin.com/gnkurl/ep81p9 - also good
for cookies, patterns, copying pictures by hand
I have no connection with any of these suppliers. Rio is close to
where I work so I use them a lot.
Noel’s suggestion about stitches works well, just be sure you can
make the stitches go away after soldering.
Judy Hoch, G.G.