Introduction to the composition of electric soldering iron
The typical structure of an electric soldering iron used in electronic industry design mainly includes a soldering iron head, a heating wire, a handle, a terminal post, a power cord, a power plug, and fastening screws.
There are two types of soldering irons: external heating type and internal heating type.
The external heating electric soldering iron consists of a soldering iron head, a soldering iron core, a shell, a wooden handle, a power lead, a plug and other parts. Because the soldering iron tip is installed inside the soldering iron core, it is called an externally heated soldering iron. The soldering iron core is a key component of the electric soldering iron. It consists of a heating wire 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. There are many specifications for external heating soldering irons, commonly used ones are 25W, 45W, 75W, 100W, etc. The higher the power, the higher the temperature of the soldering iron tip.
The internal heating electric soldering iron consists of a handle, a connecting rod, a spring clip, a soldering iron core, and a 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 internally heated soldering iron. The common specifications of internal heating soldering irons are 20W and 50W. Due to its high thermal efficiency, a 20W internal heating soldering iron is equivalent to an external heating soldering iron of about 40W. The rear end of the internal heating soldering iron is hollow and is used to be connected to 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 When the soldering iron tip needs to be replaced, the spring clip must be withdrawn first and the front end of the soldering iron tip must be clamped with pliers. Pull it out slowly and remember not to use too much force to avoid damaging the connecting rod.
Generally, internal heating soldering irons of about 35W are used in electronic production. Of course, a 50W external heating soldering iron can be prepared. Due to its high thermal efficiency, a 20W internal heating soldering iron is equivalent to an external heating soldering iron of about 40W. The common internal heating and lead-free long-life internal heating soldering irons on the market have powers of 20W, 25W, 35W, 50W, etc., of which 35W and 50W are the most commonly used.
