Electronics > Projects, Designs, and Technical Stuff

An alternative method for soldering through-hole components

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tooki:

--- Quote from: GeorgeOfTheJungle on March 15, 2019, 08:52:45 am ---
--- Quote from: MarkF on March 14, 2019, 09:52:48 pm ---

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LOL there are so many things wrong in this video I don't even know where to start. And the biggest problem is that this guy is... a teacher in a faculty? In whose hands do our poor sons end up these days? Just imagine how wet one's got to have the sponge to say "when the tip touches the sponge the temperature drops".

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They're teaching to NASA standards, which were designed for high reliability. So… sorry, gonna believe them more than you.

As for tip temperature dropping when touching the sponge: when lead-free soldering came about, the soldering equipment vendors all studied why it is that their existing tip designs failed so much more quickly when doing lead-free. And one reason (not the only one) is the thermal shock of touching the damp sponge. At the higher lead-free temps, the shock caused micro-cracking in the plating, allowing solder to touch the copper core material, dissolving it away. So this isn't an imagined problem, it's based on actual scientific study. (The solution is the brass wool we now use. That and thicker plating on the tips.)

tooki:

--- Quote from: David Hess on March 15, 2019, 02:57:19 am ---
--- Quote from: tooki on March 15, 2019, 02:18:01 am ---
--- Quote from: David Hess on March 15, 2019, 01:13:17 am ---
--- Quote from: tooki on March 14, 2019, 09:29:18 pm ---Many cheap components use tinned steel leads. Take a magnet to them sometime, you'll be surprised. Similarly, see how some rust...
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Kovar and alloy 42 are also magnetic.
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Sure, but how often is one soldering those to a PCB??
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Ever solder a 1N4148 diode or a film resistor?

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D’oh! Yes, diodes. Totally slipped my mind. When I think of glass, I immediately think of light bulbs and neons and the like. But you’re right of course!!

wraper:
Electrolytic caps often have iron leads.

soldar:

--- Quote from: wraper on March 15, 2019, 02:26:25 pm --- Electrolytic caps often have iron leads.
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I believe they are discussing making them of plastic.  :P

wraper:

--- Quote from: soldar on March 15, 2019, 02:44:02 pm ---
--- Quote from: wraper on March 15, 2019, 02:26:25 pm --- Electrolytic caps often have iron leads.
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I believe they are discussing making them of plastic.  :P

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BGA sometimes have metal plated plastic balls.

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