4 characteristics of external heating soldering iron
1. External heating soldering iron
It consists of a soldering iron head, a soldering iron core, a shell, a wooden handle, a power lead, a plug and other parts. The soldering iron head is installed inside the soldering iron core, which is called an externally heated electric soldering iron.
2. Components
The soldering iron core is a key component of the electric soldering iron. The heating wire is wound in parallel on a hollow porcelain tube. The mica sheet in the middle is insulated, and two wires are drawn out to connect to the 220V AC power supply.
3. Product specifications
There are many specifications for externally heated soldering irons. Commonly used specifications include 25W, 45W, 75W, 100W, etc. The higher the power, the higher the temperature of the soldering iron tip.
The power specifications of soldering iron cores are different, and their internal resistances are different. The resistance of a 25W soldering iron is about 2k Ω, the resistance of a 45W soldering iron is about 1 k Ω, the resistance of a 75W soldering iron is about 0.6 k Ω, and the resistance of a 100W soldering iron is about 0.5 k Ω.
4. Use materials
The soldering iron tip is made of copper material. Its function is to store and conduct heat. The temperature must be much higher than the temperature being soldered.
The temperature of the soldering iron is related to the volume, shape, length, etc. of the soldering iron tip. When the volume of the soldering iron tip is relatively large, the holding time will be longer.
In order to adapt to the requirements of different welding objects, the shape of the soldering iron tip is different, generally tapered, chisel-shaped, rounded bevel and other shapes.
