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Below are all of the forum threads, including all
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Post subject: Soldering Tip
Posted: Tue Mar 16, 2010 11:27 pm
Joined: Sun Aug 03,
2003 2:02 pm Posts: 451 Location: Erie,
This afternoon I was doing
some soldering of copper plumbing (moving the
washing machine connections in the basement) and
ran into an unexpected situation where the
propane torch was not able to deliver enough
heat because of the large amount of copper
fittings in the immediate area. I was using the
standard Pb-Free plumbing solder (SnSb5), which
has a melting temperature of around 235 °C.
It just wasn't going to work. I pulled out
the MAPP/Oxygen torch, but alas the Ox bottle
was empty. What to do?
I have a good stash of the good old 60/40 PbSn
solder, which has a melting temperature of
around 188 °C. That's 45 degrees lower - pretty
It worked. The solder flowed
readily into the joints using the propane torch,
and as a bonus, the comforting signature shiny
finish resulted. Lead-free solders are dull when
cool... the way we used to know to spot a cold
solder joint. Since the downstream flow goes
only to a washing machine, I am not concerned
about the lead content (not that I would be
anyway, since the 1950s vintage house is filled
So, this is a good reminder for
anyone else facing a similar situation whether
with a plumbing project or with an
electrical/electronic project that is difficult
or impossible to solder due to not being able to
transfer enough heat.