How do junior electricians use electric soldering iron, tips for using electric soldering iron
1. Select suitable high-quality solder, and low melting point solder wire for welding electronic components should be selected.
2. Appropriate amount of flux, use 25% rosin dissolved in 75% alcohol (weight ratio) as flux, appropriate amount of flux is indispensable, but don't think that the more the better. Excessive rosin not only causes the workload of cleaning around the solder joints after welding.
3. The soldering iron should be tinned before use. The specific method is: heat the 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 evenly coated A layer of tin.
4. Soldering method, clean 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. Solder joints should be in the shape of sine wave peaks, and the surface should be bright and smooth without tin thorns.
7. The amount of solder should be appropriate. Excessive solder not only consumes more expensive tin unnecessarily, but also increases the soldering time and reduces the working speed accordingly. What's more serious is that in high-density circuits, excessive tin can easily cause imperceptible short circuits.
8. 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.
9. The integrated circuit should be soldered last, and the electric soldering iron should be reliably grounded, or soldered with residual heat after power failure. Or use a special socket for integrated circuits, and then plug the integrated circuit after soldering the socket.
10. The soldering iron should be placed on the soldering iron stand.
