How to make electric soldering iron more effective at welding
1. When using an electric soldering iron for welding, it is necessary to ensure that each solder joint is firmly welded and in good contact to ensure welding quality.
2. Good solder joints require bright tin spots, smooth and burr-free, and moderate tin content. Tin and solder are firmly fused. There should be no false welding and false welding.
3. Pay attention to prevent the problem of false welding and false welding: virtual welding means that only a small amount of tin is welded at the solder joint, resulting in poor contact, sometimes on and off. False welding means that it seems to be welded on the surface, but in fact it is not welded. Sometimes the lead wire will be pulled out from the solder joint when it is pulled out by hand.
Only after a large number of serious welding practices can these two major problems be avoided.
4. When soldering the circuit board, the time must be controlled. If the time is too long, the circuit board will be burnt, or the copper foil will fall off. When removing components from the circuit board, stick the tip of the electric soldering iron on the solder joint, and pull out the component after the tin on the solder joint melts.
5. Flux (rosin and soldering oil) is the key to welding. Fresh rosin and non-corrosive soldering oil are helpful for high-quality welding, and can make the surface clean and beautiful. Use multi-purpose flux.
Some precautions for using electric soldering iron
1. Select suitable solder, low melting point solder wire for welding electronic components should be selected.
2. Flux, use 25% rosin dissolved in 75% alcohol (by weight) as flux.
3. The electric soldering iron should be tinned before use. The specific method is: heat the electric soldering iron, and when it can melt the solder, apply flux, and then apply solder evenly on the soldering iron tip, so that the soldering iron tip can be eaten evenly A layer of tin.
4. Soldering 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 is gently lifted away from the solder joint along the lead of the component.
5. The welding time should not be too long, otherwise it is easy to burn the components. If necessary, use tweezers to clamp the pins to help heat dissipation.
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. The integrated circuit should be soldered last, and the electric soldering iron should be reliably grounded, or use residual heat for soldering after power failure. Or use a special socket for integrated circuits, and then plug the integrated circuit after soldering the socket.
9. The electric soldering iron should be placed on the soldering iron stand.
