What are the basic principles for the choice of a soldering iron?
Only choose the right soldering iron, in order to ensure the smooth progress of the welding work, here summarizes the general principles of the choice of soldering iron, as well as in the choice of soldering iron to consider the principle of power, together with the following.
Selection of the general principles of the soldering iron
1, the shape of the iron head, can be adapted to the requirements of the surface of the soldered parts and product assembly density.
2, the tip of the soldering iron head temperature, need to be compatible with the melting point of the solder, generally need to be higher than the melting point of the solder 30-80 ℃ (excluding the soldering iron head in contact with the soldering point when the temperature drops).
3, the soldering iron heat capacity to be appropriate, the temperature recovery time of the soldering iron head needs to be adapted to the requirements of the surface of the object being soldered.
Temperature recovery time refers to the welding cycle, the temperature of the tip of the soldering iron head due to heat dissipation and reduced, and then return to the highest temperature required time. It is related to the soldering iron power, heat capacity and the shape and length of the iron head.
Select the power principle of the soldering iron
1, welding integrated circuits, transistors and other heat-sensitive components, consider the choice of 20W endothermic or 25W exothermic soldering iron.
2, welding thicker wires and coaxial cables, consider the choice of 50W endothermic or 45-75W external hot soldering iron.
3, welding larger components, such as metal chassis grounding pads, should choose more than 100W soldering iron.
Summarize:
The larger the soldering iron head, the relatively larger the heat capacity, for continuous welding, the larger the use of the soldering iron head, the smaller the temperature drop.
Large soldering iron head of high heat capacity, welding can be used at lower temperatures, the iron head is not easy to oxidize, can extend the service life of the iron head.
A soldering iron tip and soldering point contact area of the soldering iron tip, large contact area can produce effective heat transfer, soldering iron tip size does not affect the neighboring components as a standard. Selecting a geometry that makes full contact with the soldering joint improves soldering efficiency.
Various shapes of the soldering iron tip, the main points of choice: often maintain a certain amount of solder, fast and effective melting of the solder on the connector, does not produce false soldering, hitching, hanging tin, soldering joints without burrs, do not burn the board and components.
