Having the right experience can prevent electric soldering iron welding mistakes.
1. Select the appropriate solder, it is recommended to use low melting point solder wire for welding electronic components.
2. Flux, use 25% rosin dissolved in 75% alcohol (by weight) as flux.
3. The soldering iron should be tinned before use. Method: heat the soldering iron, and when the solder is just melted, apply flux, and then apply solder evenly on the soldering iron tip, so that the soldering iron tip can evenly eat a layer tin.
4. Welding method: Polish the pads and component pins with fine sandpaper, and apply flux. Dip an appropriate amount of solder with the tip of the soldering iron and touch the solder joint. After the solder on the solder joint is completely melted and immersed in the component lead, the soldering iron tip gently picks up along the lead of the component and leaves the solder joint.
5. The welding time should not be too long, otherwise it is easy to burn the components, and the pins can be clamped with tweezers to help dissipate heat.
6. The solder joints should be in the shape of sine wave peaks, the surface should be bright and smooth, without tin thorns, and the amount of tin should be moderate.
7. After the soldering is completed, use alcohol to clean the residual flux on the circuit board to prevent the carbonized flux from affecting the normal operation of the circuit.
8. Finally, solder the integrated circuit to ensure reliable grounding of the electric soldering iron, or use residual heat to solder after power failure. It is also possible to use a dedicated socket for integrated circuits. After the socket is soldered, the integrated circuit is plugged in.
9. When the soldering iron is not in use, it needs to be placed on the soldering iron stand.
The use and maintenance requirements of electric soldering iron
1. Use a multimeter to check whether the power line is short-circuited or open-circuited;
2. Whether the electric soldering iron leaks electricity; whether the power cord is firmly connected;
3. Are the screws loose?
4. Whether the power cord is tightened on the handle;
5. Whether the casing of the power cord is damaged or not.
