special

STORY 2: "Heat value is like a water"

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

STORY 2: Heat value is like a water

12|3
Mr. Fusamura

To make it easier to understand, we will classify soldering irons into two types: "Temperature saturation type" and "Temperature control type".

Hikaru

This seems to difficult to understand. What is the difference between these two types?

Mr. Fusamura

First, I'll talk about the "Temperature saturation type". The maximum amount of current flows through this type of soldering iron; In other words, it is always "ON".

Hikaru

I see! Then, the iron temperature must increase without limit. I don't want such hazardous soldering iron.

Mr. Fusamura

Ha-ha-ha (Laughing). Now, look at this graph.

Rising time graph

When the temperature saturation type soldering iron is energized, the iron temperature will increase to a certain temperature and then will not increase any more. This temperature is called the "saturation temperature", which is the specified operating temperature of the soldering iron.

Hikaru

You mean the iron temperature will not increase without limit. Why?

Hikaru