Soldering irons can be heated in the absence of oxygen. Because oxygen is not involved in the heating process of the soldering iron.
The electric soldering iron is heated by the heating phenomenon when the electric current passes through the alloy resistance wire. Electric soldering irons can be roughly divided into two types: internal heating and external heating.
The external heat type places the tip of the soldering iron in the center of the heating body. Since the heat source comes from outside the tip of the soldering iron, it is called the external heat type. The internal heating type makes the tip of the soldering iron hollow, and the heating element is placed in the cavity, so the volume is relatively small.
Although the oxygen mentioned by the subject does not play any role in the heating process of the soldering iron, it still has a great "contribution" in interfering with welding and shortening the life of the soldering iron.
The heating wire in the high temperature state will be oxidized in the aerobic environment. After a long time, the oxide layer will fall off, which will cause the heating wire to become thinner and damaged, and shorten the service life of the soldering iron. In addition, oxygen will also cause an oxide layer on the surface of the molten tin and the metal to be welded, which will block the welding process. For this reason, the soldering work is inseparable from the flux, and its function is to prevent oxidation.
If you can really create an oxygen-free environment for welding, it will greatly improve the welding efficiency, soldering aluminum will become a breeze, and at the same time prolong the service life of the soldering iron. But people have to wear oxygen masks. Of course this is just a joke.
When actually using an electric soldering iron, pay attention to the following points: ①Choose an electric soldering iron with a suitable wattage, and do not overheat the soldering iron, otherwise it will waste electric energy and accelerate the oxidation process and affect the welding; ②Learn to observe and judge the temperature and fluidity of the 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, the temperature is too high, you need to reduce the wattage or use a constant temperature soldering iron. ③ Prevent violent vibration. Because the high-temperature materials used to make the soldering iron core are made of ceramic or mica, it is easy to break, so handle it with care. ④It is strictly forbidden to use acid flux when soldering 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 acid flux to do the tinning work, then carefully clean it, and finally use rosin flux to completely weld.
