1) Master the heating time well

The method is to complete the welding point in less than 5 seconds, preferably around 3 seconds. This time includes all necessary operations required to generate connections, and the shorter the time, the better, while ensuring that the solder wets the solder.

2) Maintain appropriate temperature

Keep the soldering iron tip in the appropriate temperature range. The general experience is that the temperature of the soldering iron head is 50 degree higher than the melting temperature of the solder, which is more suitable.

3) It is incorrect to apply force to the solder joint with a soldering iron. It will cause damage to the weldment. For example, the welding points of Potentiometer, switch and connector are often fixed on plastic components, and the result of force application is likely to cause component failure.

Many electric soldering irons have three terminals, two of which are connected to the soldering iron core for connecting to a 220V AC power source, and the other is connected to the soldering iron shell as a grounding protection terminal for connecting to a ground wire. For safety reasons, it is best to use a multimeter to identify whether the soldering iron core is disconnected or mixed before use.

The resistance of the iron core for a typical 20-30W electric soldering iron is 1500-2500 ohms.