Arc striking device for DC welding machine

Abstract

The invention relates to an arc striking device of a direct current welder. The arc striking device comprises a boosted circuit for improving output voltage of the direct current welder and a control circuit for controlling the boosted circuit; the boosted circuit comprises an inductor LG1, a switch tube T1, a diode D1 and a capacitor C; the control circuit comprises a voltage judgment unit for judging whether a welding loop is in a short circuit, a single stabilization trigger controlled by the voltage judgment unit and an oscillator controlled by the single stabilization trigger. The inductor LG1, the diode D1, a welding gun and a welding piece form the welding loop, when a welding wire on the welding gun and the welding piece are transited from the short circuit to an open circuit, a string of high-frequency impulses is output by the control circuit, the switch tube T1 is driven to be opened and closed alternatively to enable the boosted circuit to rise the voltage, and it is guaranteed that arc ignition is carried out again; and after arc striking is finished, the boosted circuit will stop working, and safety of a welding worker is guaranteed. The arc striking device is simple in structure and high in arc ignition success rate.

Description

technical field [0001] The invention relates to an arc striking device of a DC welding machine, which is helpful for the ignition of an electric arc, and is composed of electronic components. Background technique [0002] During arc welding, the electrode or wire is heated and melted to form droplets. In the process of entering, short-circuits often occur. After the droplets are separated from the electrode, the arc must be re-ignited immediately. The welding power source must have a high no-load voltage (that is, the voltage output by the arc welding power source when the welding circuit is open), but the no-load voltage is too high for the welder and increases the rated capacity of the arc welding power source. SUMMARY OF THE INVENTION [0003] The technical problem to be solved by the present invention is to provide an arc striking device for a DC welding machine, which can immediately output a higher voltage on the welding circuit to reignite the arc when arc striking ...

AI Technical Summary

Problems solved by technology

[0002] During arc welding, the electrode or welding wire is heated and melted, and a short circuit often occurs during the formation of a droplet entering the process. After the droplet leaves the electrode, the arc must be ignited again immediately. The welding power supply must have a high no-load voltage (that is, the output voltage of the arc welding power supply when the welding circuit is open), but the no-load voltage is too high to be unsafe for welders, and it will increase the rated capacity of the arc welding power supply

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