Having difficult time soldering 3 1/2" x 5" pieces of 24 guage
copper. Taking silversmithing lessons and with the instructor we
sweat soldered the first piece and the solder flowed. Fluxed the
second piece of copper and tried to solder the pieces together. Used
two acetylene/air (not acetylene/oxygen) torches with #3 tips and
thought we had the pieces soldered together. Noticed a small space
between the two pieces of metal and when sticking an xacto blade into
the opening it kept getting larger and larger until the two pieces
came apart. The only thing holding the pieces together.
Then tried Propane/Ogygen with A fittings with the Smith AT615
rosebud orfice tip but again was not able to generate enough heat to
meld the pieces together.
I found that I can solder the eyes and mouth and appendages after
the first two pieces are bonded without affecting the first
soldering. Again my silver solder is extra hard with melt point of
about 1450. Need that as I enamel my pieces with glass in an oven at
1365 degrees and any softer solder would just remelt.
Totally confused with the various I have been trying to
ferret out. Not sure what gasses I should use, what size tips, size
tanks if that makes a difference. Just do not want to buy any more
equipment until I am sure what I am doing. It has been recommended
that I use something like the rosebud tip (3/4" tips with multiple
orfices) and using B type hoses and fittings for the propane/oxygen
which would give me 286,350 BTU’s as opposed to the 39,840 BTU’s I
would get with the A hoses and tips. I don’t know how much heat I can
get with Acetylene/Oxygen but I will look it up. But again I need to
try before buying more stuff. Possibly my cheapest way for the time
being is getting adapters from A to B fittings and getting the larger
tip for the Propane/Oxygen. Or do I need to go to Oxygen Acetylene?
Attached is a jpg of what I am trying to solder together.
Would appreciate any feedback.