Bill:
Thank you so much!!
Gary K5AMH
On 8/12/2016 14:00, Bill Crowell, N4HPG via BVARC wrote:
All,
Hand soldering is very much an art form. I was pretty good at it, but
have been learning over the years. I have learned a lot from Brian,
KF4VOO as well as watching NASA training videos on YouTube and from
other sources. These topics I’ve discussed on the air, but putting
them in writing for the rest of the class <grin>.
Let me give these out as a series of points:
1. Use Eutectic solder - 63/37. That’s 63% tin and 37%lead. Eutectic
means that both components melt/freeze at the same temperature. This
is extremely important for hand-soldering. 60/40 is easier to
manufacture, but gives poorer results because it was also designed for
flow soldering. None of that lead-free crap. My XYL, Dasha is an
environmental engineer (and a licensed Professional Engineer in the
State of TEXAS). She’s not worried about lead contamination from our
soldering leaching into the ground water and killing kittens and
puppies and that’s good enough for me.
2. The flux should be rosin core. Period.
3. The diameter should be skinny. 0.46mm - the reason is that we don’t
want too much solder in the joint.
And for today’s topic: Flux.
In an ideal solder joint, there should just be the proper fillet of
solder where the junction is formed. Those of you who are welders
understand fillets.
The amount of flux inside even the best solder tends to cause the
operator to apply too much solder to the joint. The internal flux
dissipates before the heat-bridge gets the solder flowed.
The answer - add flux to the joint. I suggest liquid flux where the
rosin is dissolved in alcohol.
I got some good flux from Fry’s and picked up a Weller squeeze bottle
with a needle in it. This dispenser SUCKS. Flux all over the work and
the bench. A waste of money and time in cleaning. Liquid flux is
sticky until completely dried out.
The solution to the problem with the SOLUTION was to get a really good
bottle+cap+dispensing needle. I found a deal on Amazon linked here:
https://www.amazon.com/gp/product/B01G2QZQG8/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
This kit is for “Vape” - whatever that is. It’s an inexpensive kit of
various bottles and dispensing needles. The needles are for syringes,
but not for the pokey kind - just a blunt tip.
In the bottle with yellow cap and yellow needle is the flux. It’s all
happy and drips out just the right amount. The black is even finer and
filled with lubricating oil for my guns. I’ll use the other bottles
and sizes for various glues and such.
Here’s a link to the flux I got at Fry’s, but available on Amazon:
https://www.amazon.com/MG-Chemicals-8351-125ML-Halogen-Bottle/dp/B00S16UAGE/ref=sr_1_4?s=industrial&ie=UTF8&qid=1471028240&sr=1-4&keywords=liquid+flux
Just a drop or 2 makes a big difference. Keeping 100 drops OFF the
bench makes it funner.
73
Bill Crowell, N4HPG
Pearland, TX
n4...@comcast.net <mailto:n4...@comcast.net>
I prefer to live a life of galvanic isolation.
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