A soldering iron can be heated in an oxygen-free environment. Because oxygen does not participate in the heating process of the soldering iron.

If we can create an oxygen-free environment for welding, it will greatly improve the welding efficiency, welding aluminum will become a breeze, and it can also extend the service life of the soldering iron.

When actually using a soldering iron, pay attention to the following points: 1. Choose a soldering iron with appropriate wattage and do not overheat the soldering iron, otherwise it will waste electricity and accelerate the oxidation process and affect the welding. 2. Learn to observe and judge the temperature and fluidity of solder. When the solder temperature is suitable, the surface will be very bright silvery white and have good fluidity. If the surface turns blue quickly, it means the temperature is too high and you need to reduce the wattage or use a constant temperature soldering iron. ③Prevent severe vibration. Because the high-temperature-resistant materials used to make the soldering iron core are made of ceramic or mica, they are easily broken, so handle them with care when using them. ④It is strictly prohibited to use acidic flux when welding electronic components to prevent corrosion and leakage. The best flux is rosin. However, when welding steel parts, if there is difficulty in tinning, you can first use acidic flux to do the tinning work, then clean it carefully, and finally use rosin to flux and solder completely.