Soldering, basic instructions

Posted on ke 18 heinäkuu 2018 in Articles

Hand soldering is still a thing if one does prototypes, repairs old stuff or intricate small batch production.

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Soldering standard components ( 2 pads in the ends of the component ):

1. Heat the pad in PCB, then add LITTLE solder to it.

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2. Heat the solder in the pad and push/slide the component from side to it's place.

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3. Add solder to the opposite side.

4. Add MORE solder to the first side if needed.

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These were soldered with Sn/Pb solder which is used only in aerospace, medical and other high reliability applications. Solder joint needs to be shiny -otherwise we have so called cold joint which will conduct poorly and is prone to crack. Normal solder does not give as good visual indication of the success of the joint formation.



Note:

If your solder tip starts to look like this == it looses it's lustre:

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It means there is oxide layer which will prevent heat from conducting to where you want. If that happens, add solder to the tip, clean it vigorously, repeat few times untill you have uniformly shiny tip:

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