1. Gripping method of electric soldering iron

The pen grip method is suitable for low-power and straight soldering iron heads, and is suitable for welding soldered parts with low heat dissipation, such as printed circuit boards in welding instruments. The grip technique is the most commonly used method for instrument workers.

The reverse grip method is to hold the handle of an electric soldering iron in the palm with five fingers. This method is suitable for high-power electricity, soldering iron, and welded parts with large heat dissipation.

2. Select electric soldering iron according to its purpose
When soldering conventional components on printed circuit boards, such as diodes, transistors, resistive and capacitive components, and integrated circuits, it is advisable to use a 20-30W internally heated soldering iron. Newcomers are advised to use 20W due to slow welding speed. When welding devices with thick pins or large area grounding points on printed circuit boards or power type connectors, it is advisable to use a 45-75W soldering iron to ensure the firmness between the soldered components and the printed circuit board or wires. It is not possible to use a low-power soldering iron to weld the solder joints of large electronic components. Due to the fast heat dissipation, the temperature of the soldering iron head drops quickly, which will form solder deposits. It appears to be soldered, but in reality, it is a virtual soldering. Welding general electronic components onto printed circuit boards with a high-power soldering iron often burns copper foil lines or electronic components.

3. Mastering the correct welding steps

The time for the operation process in steps ① - ② above should be controlled within 2-3 seconds. Beginners usually have a longer welding time, and a longer heating time may damage the copper foil on the printed circuit board and cannot be repaired. The third step plays a decisive role in the quality of the solder joint, and it is important to practice and understand its essentials.