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STORY 3: "Essential points"

Hikaru's diary on learning to solderHikaru's diary on learning to solder

STORY 3: Essential points

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Hikaru

Now, let's start soldering. First, I'll connect the plug into an outlet.

Mr. Fusamura

No Hikaru. Make sure everything is prepared before connecting the plug into the outlet.

Hikaru

What should I prepare?

Mr. Fusamura

First, ensure proper ventilation.

Hikaru

Why? Does this room smell?

Mr. Fusamura

No, it doesn't. This resin-containing solder contains flux, or an agent that makes the target metal surface easy to solder. The principal ingredient of the flux is pine resin (rosin), so it is called "resin flux cored solder".

Types of Resin Flux
R type
Does not contain any activator. The R type flux is used for soldering that requires high reliability, because it contains no chemical substance that causes corrosion.
RMA type
To increase solderability of the flux, a small quantity of activator is added. Among the three types described here, the RMA type flux is ranked at an intermediate position, in terms of reliability and solderability.
RA type
The RA type flux contains a larger quantity of activator than the RMA type. The RA type is used for soldering that requires excellent solderability.

* Activator: Chemical substance that contains organic acid and amine. It is added to flux to improve solderability.