Is it preferable to heat the soldering iron from the inside or the outside?
First, we can’t absolutely say which one is better, it depends on what your application is: for welding small parts, such as electronic components, internal heat is good; for large parts, external heat is easy to use.
Second, the structure is different: 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 to be welded.
Third, in terms of power: low-power electric soldering irons are generally internally heated, suitable for welding small parts. For example, the power of welding semiconductor devices and integrated circuits is not more than 30W. High-power soldering irons are generally heated externally, and are used for welding larger pieces. The larger the metal area, the greater the power of the soldering iron used.
Fourth, the heating speed is different: the internal heating type heats up quickly, has a large head, and has a short lifespan, and is usually a small capacity; the external heating type heats slowly, has a small head, and a long lifespan, and can be used for a larger capacity.
