Types of soldering irons
1. External heating electric soldering iron
It consists of soldering iron tip, soldering iron core, shell, wooden handle, power lead, plug and other parts. Because the soldering iron head is installed inside the soldering iron core, it is called an external heating type electric soldering iron. The soldering iron core is the key component of the electric soldering iron. It is formed by winding the heating wire in parallel on a hollow porcelain tube. The mica sheet in the middle is insulated, and two wires are drawn out to connect with the 220V AC power supply. There are many specifications of external heating electric soldering irons, commonly used are 25W, 45W, 75W, 100W, etc. The higher the power, the higher the temperature of the soldering iron tip.
2. Internal heating electric soldering iron
It consists of a handle, connecting rod, spring clip, soldering iron core, and soldering iron tip. Because the soldering iron core is installed inside the soldering iron head, it heats up quickly and has a high heat utilization rate. Therefore, it is called an internal heating type electric soldering iron. The common specifications of internal heating electric soldering iron are 20W and 50W. Due to its high thermal efficiency, a 20W internal heating soldering iron is equivalent to a 40W external heating soldering iron. The rear end of the internal heating type electric soldering iron is hollow, used to be sleeved on the connecting rod, and fixed with a spring clip. When the soldering iron tip needs to be replaced, the spring clip must be withdrawn first, and the front end of the soldering iron tip should be clamped with pliers. Pull it out slowly, remember not to use too much force, so as not to damage the connecting rod.
3. Constant temperature electric soldering iron
The electric soldering iron is equipped with a temperature controller with a magnet in the head of the constant temperature electric iron to control the temperature control by controlling the power-on time, that is, when the electric soldering iron is energized, the temperature of the soldering iron rises. When the Curie point is reached, the magnetism disappears, so that the magnetic core contact is disconnected, and then the power supply to the electric soldering iron is stopped; when the temperature is lower than the Curie point of the strong magnet sensor, the strong magnet returns to magnetism and attracts the moving magnet. The permanent magnet in the core switch makes the contacts of the control switch close and continues to supply power to the soldering iron. This cycle goes on and on, and the purpose of temperature control is achieved.
4. Tin-absorbing soldering iron
It is a desoldering tool that integrates the piston type tin absorber and the electric soldering iron into one. It has the characteristics of convenient use, flexibility and wide application range. The disadvantage of this soldering iron is that it can only desolder one solder joint at a time.
