What to do if the soldering iron does not eat 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 and does not stick to the tin because it has been out of use for a long time, what should I do?
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.
