Features of external heat soldering irons
1、External heat type soldering iron
Soldering iron head, iron core, shell, wooden handle, power lead, plug and other parts of the composition of the iron head installed in the iron core inside, known as the external heat type soldering iron.
2、Components
Soldering iron core is the key component of the soldering iron, the electric wire parallel winding in a hollow porcelain tube, the middle of the mica sheet insulation, and lead to two wires and 220V AC power supply connection.
3、Product specification
External thermal soldering iron specifications are many, commonly used specifications are 25W, 45W, 75W, 100W, etc., the greater the power of the soldering iron head temperature is higher.
The different power specifications of the iron core, its internal resistance is different. 25W soldering iron resistance value is about 2k Ω, 45W soldering iron resistance value is about 1 k Ω, 75W soldering iron resistance value is about 0.6 k Ω, 100W soldering iron resistance value is about 0.5 k Ω.
4, the use of materials
Soldering iron head made of copper material, its role is to store heat and conduct heat, the temperature must be much higher than the temperature of the soldering.
The temperature of the soldering iron is related to the volume, shape and length of the iron tip. When the volume of the iron head is relatively large, the holding time is longer.
In order to adapt to the requirements of different welding materials, the shape of the soldering iron head has the same, generally conical, chisel-shaped, round beveled shape and other shapes.
Shape.
3、Precautions for welding operation
(1) lead in the composition of the wire accounted for a certain proportion of lead is harmful to the human body, in the operation of gloves or operation after washing hands, to avoid eating.
(2) the chemical substances volatilized when the flux is heated is harmful to the human body, in the operation of the human nose from the soldering iron head is too close, it is easy to inhale the harmful gases. General nose from the soldering iron distance of not less than 30cm, generally 40cm is appropriate.
(3) the use of soldering iron configuration soldering iron stand, generally placed in front of the right side of the workbench, soldering iron in the use of, must be placed in the iron stand, and pay attention to wires and other things can not touch the head of the soldering iron.
