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Hikaru's diary on learning to solder Hikaru's diary on learning to solder
STORY 4: "How does the soldering iron work?"
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Hikaru : But the wire is connecting to the terminal.
Mr. Fusamura : It seems to connect to the terminal but it will come off if it is left in this condition.
Hikaru : Really? What causes the failure? Apply solder to the soldering tip before soldering.
Photo 7
Mr. Fusamura : Hikaru, you melted the solder with the soldering iron when soldering the wire, didn't you? (Photo 6)
Hikaru : Sure. I know that the soldering iron is a tool for melting solder.
Mr. Fusamura : The soldering iron is a tool for heating the target metal up to the temperature at which solder melts and spreads over the metal. Hikaru, your method cannot heat up the target metal sufficiently, so the solder does not spread. Good soldering spreads the solder so that it looks similar to the base of Mount Fuji.
Mount Fuji
Hikaru : Really?
Mr. Fusamura : Solder must be wet and spread like a water drop on glass spreads over the glass surface. The GOOD/NG judgment of soldering depends on the wettability and spreadability of the solder.
Hikaru : Does solder become wet and spread?
Mr. Fusamura : Yes. Heat up the target metal and then feed the solder. The wet and spread solder will be absorbed into the target metal and the atoms of the metal will be linked with the atoms of the solder. This is the principle of soldering.
Hikaru : You mean a metal soaks into another metal? You must be kidding!
Mr. Fusamura : When looking at the atomic level, there are many apertures in metal, like a sponge. Solder is soaked into this "sponge" to link metals.
Hikaru : I understand. Soldering is very useful to learn. I should not apply solder to the metal, but make the solder soak into the metal. Mr. Fusamura, could you show me a good example?

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