Turn on the electricity and heat for about 3 minutes, the solder can be melted and it can work. The electric soldering iron cannot be fired empty, it can work continuously.

1. Continuous empty burning of ordinary electric soldering iron will cause oxidation of the soldering iron tip and affect the service life.

2. Continuous empty burning, you will find that the copper in the heating part of the soldering iron has been burned red, which will affect the life of the soldering iron.

3. Continuous work, such as welding all the time, this is not empty burning, and long-term work will not damage the soldering iron.

4. The constant temperature soldering iron can be powered on all the time, because the temperature will not be too high.

1. The electric soldering iron is divided into two types: external heating type and internal heating type:
(1) The external heating electric soldering iron is composed of a soldering iron tip, a soldering iron core, a shell, a wooden handle, a power lead, a 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 [1].

(2) The internal heating electric soldering iron is composed 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 internal heating type electric soldering iron. The commonly used 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 When the soldering iron tip needs to be replaced, the spring clip must be withdrawn first, and the front end of the soldering iron tip should be clamped with pliers.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.

2. In the maintenance of mobile phones, the components on the circuit board are often replaced, requiring the use of an electric soldering iron, and the requirements for it are also very high. This is because the components of the mobile phone adopt the surface mount process, the components are small in size, highly integrated, the printed circuit is fine, and the pad is small. If the soldering iron is not selected properly, it is easy to cause human faults during the soldering process, such as false soldering, short circuit or even soldering of the circuit board. Therefore, it is necessary to use a high-end soldering iron as much as possible, such as a constant temperature and anti-static soldering iron. In addition, some large devices such as shielding covers need to use high-power electric soldering irons, so an ordinary 60W or more thick-tip electric soldering iron should be prepared.