The power principle of choosing a soldering iron
① The shape of the soldering iron tip should adapt to the requirements of the workpiece surface and the assembly density of the product.
② The top temperature of the soldering iron tip should be adapted to the melting point of the solder, generally 30-80 ℃ higher than the melting point of the solder (excluding the temperature drop when the soldering iron tip contacts the soldering point).
③ The heat capacity of an electric soldering iron should be appropriate. The temperature recovery time of the soldering iron tip should be adapted to the requirements of the surface of the workpiece being soldered. The temperature recovery time refers to the time required for the temperature at the tip of the soldering iron to decrease due to heat dissipation during the welding cycle and then recover to the highest temperature. It is related to the power and heat capacity of the soldering iron, as well as the shape and length of the soldering iron tip.
The power principle for selecting an electric soldering iron is as follows:
① When soldering integrated circuits, transistors, and other heat sensitive components, consider using a 20W internal heating or 25W external heating soldering iron.
② When welding thicker wires and coaxial cables, consider using a 50W internal heating or 45-75W external heating soldering iron.
③ When welding larger components, such as metal chassis grounding pads, a soldering iron with a power of over 100W should be selected.
Use of soldering iron
Electric soldering irons should not be left unused for long periods of time, as this can accelerate the oxidation of the soldering iron core and burn it out, shortening its lifespan. At the same time, it can also cause the soldering iron tip to oxidize due to prolonged heating, and even be "burned" and no longer "eat tin".
Precautions for using electric soldering iron
① Reasonably select different types of soldering irons according to the welding object.
② Do not strike the soldering iron tip randomly during use to avoid damage. The wall thickness of the steel pipe connecting rod of the internal heating electric soldering iron is only 0.2mm, and it cannot be clamped with pliers to avoid damage. Regular maintenance should be carried out during use to ensure that a thin layer of tin is hung on the soldering iron tip.,,
