What is the difference between internal heat and external heat in a soldering iron?
The externally heated soldering iron uses an electric heating tube on the outside, and the copper electric soldering iron head is heated inside the tube. The internally heated soldering iron uses an electric heating core heated inside the copper soldering iron. The thermal efficiency of the internally heated soldering iron is higher than that of the externally heated soldering iron.
The heating element of the internal heating type is inside the copper head, and its thermal efficiency is relatively high. The heating wire of the external heating type is outside the copper head, and the power of the soldering iron is related to the area of the metal being welded. A low-power soldering iron is suitable for soldering small parts. For example, the power for welding semiconductor devices and integrated circuits should not exceed 30W. Use a high-power soldering iron to solder larger pieces.
The larger the metal area, the greater the power of the soldering iron used. The internal heating type heats quickly, has a large head, and has a short lifespan, and is usually of small capacity; the external heating type heats more slowly, has a small head, and has a long lifespan, and can be used for larger capacities, such as 300W1.
The difference between internal heating and external heating soldering irons:
1. The main difference is in the heating method.
2. The shape of the soldering iron tips they use, the former is hollow cylindrical; the latter is solid rod-shaped.
3. The former has a shorter preheating time, but is slightly more affected by temperature, especially the low-power type; in contrast, the latter has a slightly longer preheating time.
4. The former has slightly smaller leakage than the latter.
First, we cannot definitely say which one is better. It depends on what your use is: for welding small parts, such as electronic components, internal heat is better; for welding large parts, external heat is better.
Second, the structures are different: the internal heating heating element is inside the copper head, and its thermal efficiency is relatively high; the external heating heating wire is outside the copper head, and the power of the soldering iron is related to the area of the metal being welded.
Third, in terms of power: low-power soldering irons are generally internally heated and suitable for welding small parts. For example, the power for welding semiconductor devices and integrated circuits should not exceed 30W. High-power soldering irons are generally externally heated and are used to weld larger parts. The larger the metal area, the greater the power of the soldering iron used.
Fourth, the heating speeds are different: the internal heating type heats quickly, has a large head, and has a short lifespan, and is usually of small capacity; the external heating type heats slower, has a small head, and has a long lifespan, and can be used for larger capacities.
Personally, I think internal-heating soldering irons are easier to use, because the soldering iron tips of external-heating soldering irons on the market are not easy to tin and are inconvenient for welding. In addition, if the things you are welding need to be placed for leakage and the temperature cannot be too high, then choose this one. Thermostatic soldering iron with leakage protection
