Gas-shielded welding control circuit and gas-shielded welding machine

Abstract

The invention discloses a gas-shielded welding control circuit and a gas-shielded welding machine. The gas-shielded welding control circuit comprises a voltage providing module, a voltage adjusting module, a waveform control module, a current regulator, a pulse width modulation circuit, a driving circuit, a current feedback module and a voltage feedback module, wherein the voltage providing module, the voltage adjusting module, the waveform control module, the current regulator, the pulse width modulation circuit, the driving circuit, the current feedback module and the voltage feedback moduleare connected mutually. The waveform control module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first diode, a second diode, a first anti-reverse-connection unit, a second anti-reverse-connection unit, a first capacitor, a second capacitor, a first operating amplifier, a first power source and a second power source. The first anti-reverse-connection unit, the second anti-reverse-connection unit and the second capacitor are arranged in the waveform control module, firstly, the first capacitor is charged, and when the first capacitor is charged until conduction of the second anti-reverse-connection unit is reached, the first capacitor and the second capacitor are charged; and when conduction of the first anti-reverse-connection unit is reached, the second capacitor also participates in the process of discharging, the capacity of the capacitor is increased, the discharging speed is lowered, the current rising speed is decreased,and in this way, the arc characteristics are optimized.

Description

technical field [0001] The embodiments of the present invention relate to the field of welding technology, in particular to a gas shielded welding control circuit and a gas shielded welding machine. Background technique [0002] Gas shielded arc welding is referred to as gas shielded welding or gas electric welding. It is a fusion welding that uses an arc as a heat source and gas as a protective medium. During the welding process, the shielding gas forms a gas protective layer around the arc, which separates the arc and molten pool from the air, prevents the influence of harmful gases, and ensures the stable combustion of the arc. It is widely used in the welding field. The performance of short-circuit current in gas shielded welding directly affects the arc characteristics. [0003] However, the current performance of the short-circuit current in the gas shielded welding process is not conducive to the stability of the arc. Contents of the invention [0004] Embodiments...

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Problems solved by technology

[0003] However, the current performance of the short-circuit current in the gas shielded welding process is not conducive to the stability of the arc

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