Electric soldering iron is an indispensable tool for electronic production and electrical maintenance. Its main purpose is to weld components and wires. According to the mechanical structure, it can be divided into internal heating type electric iron and external heating type electric iron. According to the function, it can be divided into non-suction soldering iron and suction. Tin type electric irons are divided into high-power electric soldering irons and low-power electric soldering irons according to different purposes.
The soldering iron is divided into two types: external heat type and internal heat type:
The external heating type soldering iron is composed of a soldering iron head, a soldering iron core, a casing, a wooden handle, a power lead, a plug and the like. Since the tip is mounted inside the iron core, it is called an external heating type soldering iron. The iron core is a key component of the soldering iron. It is formed by winding the heating wire in parallel on a hollow ceramic tube. The mica sheet in the middle is insulated, and two wires are connected to the 220V AC power supply. There are many specifications for external thermal soldering irons, such as 25W, 45W, 75W, 100W, etc. The higher the power, the higher the temperature of the soldering iron.
The internal heat type soldering iron is composed of a handle, a connecting rod, a spring clip, a soldering iron core, and a soldering iron tip. Since the iron core is installed inside the soldering iron tip, the heat is fast and the heat utilization rate is high, so it is called an internal heat type soldering iron. The common specifications of the internal heating type soldering iron are 20W and 50W. Due to its high thermal efficiency, the 20W internal thermal soldering iron is equivalent to an external thermal soldering iron of about 40W. The rear end of the inner heating type soldering iron is hollow, and is sleeved on the connecting rod and fixed by the spring clip. When the soldering iron tip needs to be replaced, the spring clip must be first removed, and the front end of the soldering iron head is clamped with the pliers. Pull out slowly, remember not to use too much force to avoid damaging the connecting rod.