It is simple to operate the electric soldering iron with both internal and external heat.
Definition of internal heat soldering iron
The heating element is inside the soldering copper tip", or interpreted as "the soldering iron tip is covered outside the heating element", so that the heat is transferred from the inside to the soldering iron tip, which has the advantages of fast heating, high heating efficiency, small size, light weight, and low power consumption. Economical, easy to use, etc. It is suitable for soldering small components. However, due to the high temperature of the soldering iron tip, it is easy to oxidize and turn black, and the soldering iron core is easy to break, and the power is small, only 20W, 35W, 50W and other specifications.
Definition of external heat soldering iron
External heat refers to the heating outside, named after the heating resistor on the outside of the soldering iron tip. It is suitable for welding both large components and small components. There are 25W, 30W, 50W, 75W, 100W, 150W, 300W, etc.
The difference between internal heat soldering iron and external heat soldering iron
Structural aspects
First of all, there is a big difference in the structure of the soldering iron tip. The internal heating type soldering iron tip is hollow, because the heating core is built-in, and the external heating type soldering iron tip is solid core, and its heating core is external.
The external heating electric soldering iron is composed of a soldering iron tip, a soldering iron core, a shell, a wooden handle, a power lead, a plug and other parts. Because the soldering iron head is installed inside the soldering iron core, it is called an external heating type electric soldering iron. The soldering iron core is the key component of the electric soldering iron. It is formed by winding the heating wire in parallel on a hollow porcelain tube. The mica sheet in the middle is insulated, and two wires are drawn out to connect with the 220V AC power supply. There are many specifications of external heating electric soldering irons, commonly used are 25W, 45W, 75W, 100W, etc. The higher the power, the higher the temperature of the soldering iron tip.
The internal heating electric soldering iron is composed of a handle, a connecting rod, a spring clip, a soldering iron core, and a soldering iron tip. Because the soldering iron core is installed inside the soldering iron head, it heats up quickly and has a high heat utilization rate. Therefore, it is called an internal heating type electric soldering iron. The commonly used specifications of internal heating electric soldering iron are 20W and 50W. Due to its high thermal efficiency, a 20W internal heating soldering iron is equivalent to a 40W external heating soldering iron. The rear end of the internal heating type electric soldering iron is hollow, used to be sleeved on the connecting rod, and fixed with a spring clip. When the soldering iron tip needs to be replaced, the spring clip must be withdrawn first, and the front end of the soldering iron tip should be clamped with pliers. Pull it out slowly, remember not to use too much force, so as not to damage the connecting rod.
You can see it clearly from the structure diagram of the electric soldering iron. The heating core of the external heating type is separated from the tip of the soldering iron with a heating tube in the middle.
Use
The soldering iron head of the external heating type electric soldering iron is inside the heating core, which is also called an ordinary electric soldering iron. Soldering ordinary products, there is no requirement for temperature, use an external heating type electric soldering iron. Since the heating resistance wire is outside the tip of the soldering iron, most of the heat is dissipated to the external space, so the heating efficiency is low and the heating speed is slow. Generally, it takes 6 to 7 minutes to preheat before welding. Its volume is large, and it is inconvenient when soldering small devices. But it has the advantage that the soldering iron head can be used for a longer time and has a higher power.
Internal heating type electric soldering iron, the shape of the soldering iron tip used in the internal heating type electric soldering iron is hollow cylindrical, and the heating element is covered by the soldering iron tip, so that its heat is not easily dissipated into the air, so the heat utilization efficiency is higher and the warm-up time is shorter. Short, and the power generally does not need to be too large to meet the requirements. Generally, the internal heating power is below 50W, and the internal heating electric soldering iron of about 20W~30W is common. There are single handles and soldering stations. The 936 soldering station is a typical internal heat soldering iron, but it is also constant temperature. Now they are all lead-free soldering irons (lead-free soldering stations), which are better than the previous two.
