4 characteristics of external heating electric soldering iron
1. External heating electric soldering iron
Soldering iron tip, soldering iron core, shell, wooden handle, power lead, plug and other parts, the soldering iron tip is installed inside the soldering iron core, called external heating type electric soldering iron.
2. Components
The soldering iron core is the key component of the electric soldering iron. The heating wire is wound in parallel on a hollow porcelain tube, and the mica sheet in the middle is insulated, and two wires are drawn out to connect with the 220V AC power supply.
3. Product specifications
There are many specifications of external heating electric soldering irons, and the commonly used specifications mainly include 25W, 45W, 75W, 100W, etc. The higher the power, the higher the temperature of the soldering iron tip.
The power specification of the soldering iron core is different, and its internal resistance is different. A 25W iron has a resistance of about 2kΩ, a 45W iron has a resistance of about 1kΩ, a 75W iron has a resistance of about 0.6kΩ, and a 100W iron has a resistance of about 0.5kΩ.
4. Materials used
The tip of the soldering iron is made of copper material, and its function is to store heat and conduct heat, and the temperature must be much higher than the temperature to be soldered.
The temperature of the soldering iron is related to the volume, shape and length of the soldering iron tip. When the volume of the soldering iron tip is relatively large, the retention time is longer.
In order to meet the requirements of different soldering materials, the shape of the soldering iron tip is different, generally there are cone, chisel, circular bevel and other shapes.
Precautions for welding operation
1) Lead accounts for a certain proportion in the welding wire composition. Lead is harmful to the human body. You need to wear gloves or wash your hands after operation to avoid ingestion.
2) The chemical substances volatilized when the flux is heated are harmful to the human body. When the human nose is too close to the tip of the soldering iron during operation, it is easy to inhale the harmful gas. Generally, the distance between the nose and the soldering iron is not less than 30cm, and generally 40cm is appropriate.
3) Use a soldering iron to configure a soldering iron stand, which is generally placed on the right front of the workbench. After the electric soldering iron is used, it must be placed on the soldering iron stand safely, and attention should be paid not to touch the soldering iron tip with wires and other objects.
