How to choose a household electric soldering iron
The electric soldering iron is an essential tool for us to carry out circuit welding. A full understanding of the working principle of the electric soldering iron will not only help us to use the electric soldering iron better, but also allow us to know what to do so that there will be no danger. .
A constant temperature soldering iron
The constant temperature electric soldering iron realizes automatic temperature control through the attraction and separation of soft magnetic materials and magnetic steel. The constant temperature electric soldering iron is generally 45W. It is powered on and off intermittently. The actual power consumption is 25W. It uses a transformer for 24V power supply and is dual-purpose.
Working principle: When the temperature of the welding head is below the constant temperature value, the magnetic temperature sensor connected to the welding head end attracts the permanent magnet, so that the contact on the magnetic steel connecting rod is connected, and the power is sent to the heating element, so that the temperature of the welding head rises gradually . When the temperature is higher than the constant temperature, the heating element loses its magnetism, the power supply is cut off, and the heating is stopped. In this way, the power supply is automatically turned on or off, the temperature is raised and lowered repeatedly, and the electric soldering iron is kept at a constant temperature. If the type of heating element is changed, different constant temperature values can be obtained.
Magnetic switch
Constant temperature electric soldering iron has the advantages of energy saving, high efficiency, low consumption, long life, etc. It is an ideal welding tool for electronic product production and electronic repair industry.
How to choose a soldering iron?
(1) When soldering integrated circuits, transistors and components that are vulnerable to heat, consider using a 20W internal heating or 25W external heating electric soldering iron.
(2) When welding thicker wires or coaxial cables, consider using a 50W internal heating type or a 45-75W external heating type electric soldering iron.
(3) When soldering larger components, such as metal chassis grounding pads, an electric soldering iron above 100W should be used.
(4) The shape of the soldering iron tip should adapt to the surface requirements of the weldment and the assembly density of the product.
To put it simply, the power and type of the soldering iron should be reasonably selected according to the welding object. If the weldment is larger, the power of the soldering iron used should be higher. If the power is small, the soldering temperature will be too low and the solder will melt slowly. The flux is not easy to volatilize, and the solder joints are not smooth and firm, which will inevitably lead to unqualified appearance quality and welding strength, and even the solder cannot be melted, and the welding cannot be carried out. However, the power of the electric soldering iron should not be too large. If it is too large, too much heat will be transferred to the workpiece to be welded, and the solder joints of the components will be overheated, which may cause damage to the components, and the copper foil of the printed circuit board will fall off and the solder will be damaged. The flow on the welding surface is too fast and cannot be controlled, etc.
