Difference between internal and external heat of soldering iron
Endothermic soldering iron heating wire around a ceramic rod above, outside and then set on the ceramic tube insulation, the use of the soldering iron head set on the outside of the ceramic tube, the heat from the inside to the outside of the soldering iron head, called the endothermic soldering iron. External heat type soldering iron is just the opposite, the heating wire around a hole in the middle of the iron pipe, inside and outside with mica sheet insulation, the iron head inserted in the middle of the hole, the heat from the outside to the inside of the iron head, called the external heat type.
1,Different appearance
The external heat type soldering iron accumulates large, internal heat type is relatively small.
2, the structure is different
Internal heating element in the copper head inside, and external heating wire in the copper head outside.
3,Iron head is different
The endothermic iron head is hollow, because the heating core is built-in, and the exothermic iron head is solid, and its heating core is external.
The shape of the soldering iron head, endothermic is hollow cylinder, exothermic is solid rod;
4, the heating core is different
Endothermic use of ceramic heating core, heating wire around a ceramic rod above, outside and then set on the ceramic tube insulation, external hot soldering iron using conventional mica heating wire heating, heating wire around a hole in the middle of the iron pipe, inside and outside the mica sheet insulation.
5, different heating efficiency
External heat type soldering iron due to the heating resistance wire in the outside of the iron head, most of the heat emitted to the external space, so the heating efficiency is low, the heating speed is slow, warm-up time is a little long. Endothermic so that the temperature rises faster, high heating efficiency, utilisation rate than the external heat about twice as high, shorter preheating time, but by the temperature is slightly larger, especially small power type;
6, power is not the same
External heat type soldering iron power, there are 25W-300W different specifications; Internal heat type soldering iron is usually small capacity, 30w-100w and other specifications.
7, the use of different
External hot soldering iron commonly used in welding large objects, not suitable for welding small devices.
8, service life is not the same
External heat type soldering iron service life is long; internal heat type soldering iron use life is short.
