Introduction to experience and skills in preventing poor soldering of electric soldering irons
1. Choose appropriate soldering wire, and it is recommended to use low melting spot welding wire for welding electronic components.
2. Flux, dissolve 25% rosin in 75% alcohol by weight as the flux.
3. Before using an electric soldering iron, tin should be applied. Method: Heat the soldering iron and when it can just melt the solder, apply flux. Then, evenly apply the solder to the soldering iron head, so that the soldering iron head can eat a layer of tin evenly.
4. Welding method: Grind the solder pads and component pins clean with fine sandpaper and apply soldering flux. Dip an appropriate amount of solder with a soldering iron tip, touch the solder joint, and wait for all the solder on the solder joint to melt and immerse the component lead head. Gently lift the soldering iron tip up along the component pin to leave the solder joint.
5. The welding time should not be too long, otherwise it is easy to burn the components. Forceps can be used to clamp the pins to help dissipate heat.
6. The solder joint should have a sinusoidal peak shape, and the surface should be bright and smooth, with Wuxi burrs and moderate tin content.
7. After welding, clean the residual soldering flux on the circuit board with alcohol 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 soldering iron, or use residual heat for welding after power outage. You can also use a dedicated socket for integrated circuits. After soldering the socket, plug the integrated circuit in.
9. The electric soldering iron needs to be placed on the soldering iron holder when not in use.
Ways to improve the welding quality of electric soldering irons
1. When using an electric soldering iron for welding, it is necessary to ensure that each welding point is firmly welded and in good contact to ensure welding quality.
2. Good solder joints require bright, smooth, and free from burrs, with a moderate amount of tin. Tin and the solder are firmly fused. There should be no false soldering or false soldering.
3. Pay attention to preventing the problem of false soldering and false soldering: False soldering refers to only a small amount of solder stuck at the solder joint, resulting in poor contact and intermittent disconnection. False soldering refers to a situation where it appears to be soldered on the surface, but in reality it is not soldered on. Sometimes, with a single hand pull, the lead will be pulled out of the solder joint.
Only through extensive and careful welding practice can these two major problems be avoided.
4. When welding circuit boards, it is necessary to control the time. If the time is too long, the circuit board will be burnt or the copper foil will fall off. When disassembling components from the circuit board, the electric soldering iron tip can be attached to the solder joint, and after the tin on the solder joint melts, the component can be pulled out.
5. Fluxes (rosin and soldering oil) are crucial during welding. Fresh rosin and non corrosive soldering oil help to achieve high-quality welding and make the surface smooth and beautiful. Use a versatile flux.
