I am working on a pair of commissioned wedding bands that are 12 x 1
mm, sizes 10 and 5.5, in 18KWPd. The 18KPd plumb solder will not
flow. I am using Acetylene with a Prestolite torch, on a charcoal
block, and have tried black (1800 degree) flux, boric acid with
alcohol and proprietary flux from Frei and Borel. I ball up the
solder using flux, heat the metal to cherry, place the solder and
nothing happens. I must admit that I am somewhat uncertain as to
what the metal should look like at the correct temperature
The plumb solder is said to flow at 1840 degrees, and I guess that I
am probably getting about 1800 out of the acetylene. Do I simply not
have enough heat? is the capability of the torch the limiting
factor? Should I just break down and move on to another fuel and
torch? What would be recommended?
Several years ago I did a similar project with difficulty, but I
finally prevailed. Those rings were slightly smaller, but the same
everything else. In the present project I am cleaning the metal with
a scrub pad and Bon-Ami, and rinsing in water with baking soda.
Please, please, please, can someone help me? More than a few hours
in the studio with nothing to show for it but my frustration.