I do like the suggestions on teaching soldering. One item that seems
a question mark in the minds of jewelers might be added. I will
describe this as a “sometimes thing”, when the bench worker says
something like, “this is not a good day to solder.” There is truth
to that. Good days, bad days do happen. In many cases, I believe,
this is weather dependant. “WEATHER DEPENDANT” in not an excuse but
is a reality in torch work done as most of us do it, no cover gases,
no enclosed chamber.simple open air torch work. Besides the effects
of over or under heating solder and knowing the differences in melt
and flow temps., weather does play a part.
When humidity is high, the moisture in the air is simply water to an
excess. This water is nothing more than oxygen and hydrogen. Casters
know that excess humidity can affect castings as the moisture is
broken up and hydrogen is absorbed into the melt, to be released at
solidification causing porosity. Excess oxygen causes oxidation
unless the torch is set to a very reducing flame, causing only
harmless (to the metal melt) carbon monoxide to be produced.
I am convinced that humid days give jewelers more fits that dry days
in attempting to do good soldering work. The moisture works against
good casting in an uncontrolled atmosphere and would seem to do the
same with soldering, a technique also involving molten metal alloys.
The scientific evidence is solid of effects in casting. Is this a
cause of days of good solder joints and days of pitted joins? You
tell me. It is a consideration often overlooked and one with little
prevention when using an open air torch soldering technique. Most of
us must solder in open air, regardless of the ambient air conditions.
Perhaps you solder better than you think and the air is the culprit
in some cases.
Just an off the wall thought. We cannot control the humidity but can
recognize it as a deterrent to good solder work.
Thank for listening to a tiny tip of the iceburg when other issues
are certainly more relevant.
Peace and Blessings. Thomas. @Sp.T So,
there is a post. Thanks. Sorry, cannot make it to Tucson. Would be