How to improve the welding quality of electric soldering iron
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.
What to do if the soldering iron does not eat tin
What is the reason why the electric soldering iron does not eat tin? What to do when the electric soldering iron does not eat tin? Related technical articles How to deal with the electric soldering iron not eating tin
The tip of the soldering iron I used before was a copper tip, which became shorter as I used it. The parent of a student who ran an electrical business last year gave me a 30W soldering iron with an alloy tip and a coil of welding wire.
Although it is a 30W soldering iron, when soldering the circuit, the tin on the tip of the soldering iron dries up because it has been out of use for a long time, and the soldering iron does not stick to the tin at once.
I have a 30W and a 20W soldering iron, and I use a voltage regulator,
I found several 400Vuf AC capacitors in series, and used the rotary switch to separate them for step-down.
Keep the soldering iron not cold, and it will not be too hot to oxidize and not stick to tin. When you need a large soldering point with high temperature, adjust the voltage to 220V, which is very useful.
Transformer coil tap voltage regulation principle
Those who have the conditions can buy commercial solder wire, the smaller the diameter, the brighter the better.
A soldering iron is a must for people who don’t often engage in radio. When there is no solder wire, you can melt it with rosin on the back of the old circuit board.
Once the soldering iron tip does not stick to tin, if it is more severely oxidized, you can wipe it on the cement floor a few times, and if it is light, you can wipe it on the wood a few times. After heating, first dip it in rosin and then tin. It is convenient and timely to use.
The higher the wattage of the soldering iron tip, the more oxidized it will be when it is connected to the electricity for a long time. The method is to reduce the voltage. You can also use a few rectifier diodes. Turn the knob to adjust the switch, and find a plastic box to assemble a soldering iron voltage regulator by yourself.
