Principles for choosing the power of a soldering iron
① The shape of the soldering iron tip must adapt to the surface requirements of the parts to be welded and the product assembly density.
② The temperature of the tip of the soldering iron tip should be compatible with the melting point of the solder, which is generally 30-80°C 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 the soldering iron must be appropriate. The temperature recovery time of the soldering iron tip must be adapted to the requirements of the surface of the welded part. Temperature recovery time refers to the time required for the temperature of the tip tip to return to the maximum temperature after it decreases due to heat loss during the welding cycle. It is related to the power and heat capacity of the electric soldering iron and the shape and length of the soldering iron tip.
The power principles for choosing a soldering iron are as follows:
① When soldering integrated circuits, transistors and other components that are easily damaged by heat, 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 lug, you should choose a soldering iron with a power of 100W or above.
Use of soldering iron
The electric soldering iron should not be powered on for a long time without being used. This will easily cause the soldering iron core to accelerate oxidation and burn out, shortening its life. At the same time, the soldering iron tip will be oxidized due to long-term heating, and may even be "burned to death" and no longer "eat tin". .
Precautions for using soldering iron
① Choose different types of soldering irons appropriately according to the welding objects.
② Do not hit the soldering iron tip arbitrarily during use to avoid damage. The wall thickness of the steel pipe of the connecting rod of the internal heating soldering iron is only 0.2mm, so it cannot be clamped with pliers to avoid damage. It should be maintained regularly during use to ensure that the soldering iron tip is covered with a thin layer of tin.
