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Copyright: 1996 - 2024
Webmaster:
Kirt Blattenberger,
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while typing up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.
My Hobby Website:
AirplanesAndRockets.com
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Sub-Header - RF Cafe
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Soldering Tip - RF Cafe Forums
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Kirt Blattenberger
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Post subject: Soldering Tip
Posted: Tue Mar 16, 2010 11:27 pm
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Joined: Sun Aug 03, 2003
2:02 pm
Posts: 451
Location: Erie, PA
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Greetings:
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?
Well,
fortunately 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
significant.
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 with it).
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.
_________________ - Kirt Blattenberger
RF Cafe Progenitor & Webmaster
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Posted 11/12/2012
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