KENA
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29
2024
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09
Operating principle of gas welding generators
Author:
1. A gas-powered electric welding unit uses a gasoline engine as its power source, driving a generator in constant motion between the conductors of the rotor, cutting the magnetic lines of force to generate current and provide mobile power for the electric appliance.
2. A gas-powered welding unit differs from a gas generator in its excitation method; it provides the rotor with a more stable excitation source via the excitation coil, so its generator mode does not have a voltage regulator. A gas-powered welding unit mainly consists of a motor rotor, control panel, rectifier, and reactor. Its circuits include a power system, an electric welding system, and an energy receiving system.
(1) Basic principles of generation: excitation power from the excitation coil to the permanent rotor by rotating the gasoline engine, while the 220V generation coil in the permanent rotor generates current to power the electric appliance.
(2) Basic principles of power generation: excitation power from the excitation coil to the permanent rotor by rotating the gasoline engine, while the 45V generation coil (group 6) in the fixed rotor generates current to power the rectifier bridge; electric welding power is supplied via the control panel by pumping the reactor through the 28V DC rectified current.
No output current:
1. The excitation coil is not generating electricity or the excitation coil rectifier bridge is burnt out. Measure the voltage at both ends of the brush (DC18V).
2. Burning of the power generation coils or lack of contact due to carbon wear. Variable processing.
Low output voltage:
1. Electric welding, the generation switch is out of place. Adjust the switch cable.
2. Too low frequency. Adjust the speed adjustment bolt of the engine control lever and adjust the frequency to 53 - 53.5 Hz.
Low welding current:
1. Reduced power or speed of the gasoline engine; observe significant gasoline engine vibration during welding.
2. The rectifier bridge diode is burnt out; check the rectifier bridge diode for burn marks.
3. The rectifier reactor in the control panel is burnt out or the current regulator is damaged; check and repair.