Working Principles, Welding Methods, and Precautions of High-Frequency Welding Machine
Working principle of high-frequency welding machine
Firstly, there is a unique set of electronic circuits inside the high-frequency welding machine, which converts the low-frequency AC power (50Hz) input from the mains into high-frequency AC power (generally above 20,000Hz).
When the high-frequency current is applied to the inductive coil (i.e., the induction coil), it is converted into a high-frequency magnetic field by the principle of electromagnetic induction, which acts on the metal object located in the magnetic field; using the eddy current effect, a proportional induced current is generated in the metal object, which is affected by the skin effect and is more concentrated on the surface of the metal object when the frequency is higher.
When the eddy current flows in the metal object, it generates heat by utilizing the internal resistance value inherent in the object through the principle of Joule heating. This heat is directly generated inside the object. Therefore, the heating speed is fast, and the efficiency is high. It can instantly melt any metal object. Moreover, the heating speed and temperature are controllable.
Welding method of high-frequency welding machine
First, weld fine wires and small components, then weld transistors and integrated blocks, and finally weld larger and heavier components. Because the large components occupy a large area and are relatively heavy, it is more convenient to weld them later. Transistors and integrated blocks are susceptible to heat, and welding them later can prevent the heat of the soldering iron from being transmitted through the wire and damaging the transistors or integrated blocks.
Precautions for using high-frequency welding machine
Do not use the equipment when the input voltage is too high.
The internal parts of the equipment and the induction coil need to be cooled by the water, and ensure that the water source is clean, blockage of the cooling pipeline can cause equipment overheating and damage.
The water temperature of the cooling water should not be too high, preferably below 45°C.
When installing the induction coil, do not use waterproof tape to prevent electrical connections from being damaged.
Do not change the induction coil to copper welding or silver welding.
When heating materials with poor magnetic conductivity such as copper and aluminum by induction heating, the number of turns of the induction coil will increase.
The gap between the induction coil and the heating part should be 1-3mm (for small heating area).
The operators should keep the daily maintenance records of the equipment.
Use circular purple copper tubes or angle copper tubes with a thickness of 1-1.5mm and above 5 to wind the induction coil.
The equipment should avoid exposure to sunlight, rain, humidity, etc.