Pulse arc-stabilizing device of inverting alternating-current square-wave argon tungsten-arc welding machine

Abstract

The invention discloses a pulse arc-stabilizing device of an inverting alternating-current square-wave argon tungsten-arc welding machine, comprising a high-frequency power input unit, a double voltage rectification unit, an arc-stabilizing synchronous control unit and an arc-stabilizing pulse output unit, wherein the high-frequency power input unit is connected with the output end of a primary inverting switch tube; the double voltage rectification unit is connected with the output end of the high-frequency power input unit; the arc-stabilizing synchronous control unit is connected with the output end of a secondary inverting driving control circuit; and the arc-stabilizing pulse output unit is connected with the output end of the double voltage rectification unit. The pulse arc-stabilizing device disclosed by the invention has the advantages that the power energy needed by the an arc-stabilizing circuit is provided by adopting a main transformer, a double voltage rectifying circuit rectifies double voltage of a high-frequency alternating-current power supply of the main transformer into a high-voltage direct-current negative power supply with the voltage being 5 times of the no-load voltage of the welding machine, the arc-stabilizing synchronous control unit opens signals by detecting negative half waves of the alternating current and forms an arc-stabilizing pulse control signal with certain width, the arc-stabilizing pulse output unit provides certain arc-stabilizing pulse with fixed voltage, current and time for a welding circuit, the arc-breaking phenomenon of high-low current can be reliably eliminated, and good arc-stabilizing effect and higher cost performance are ensured.

Description

technical field [0001] The invention relates to an electric welding machine control technology, in particular to an arc stabilizing device suitable for a half-bridge topology secondary inverter AC square wave tungsten argon arc welding machine. Background technique [0002] Due to the advantages of corrosion resistance, low density, light weight and good mechanical properties, aluminum, magnesium and their alloy materials are becoming more and more popular, especially in aviation, aerospace, nuclear energy, road and bridge, decoration and other fields. . However, the surface of aluminum, magnesium and their alloy materials is easy to oxidize, forming a dense oxide film. The melting point of the oxide film is higher than that of aluminum and is not easy to break. The welding of aluminum, magnesium and its alloy materials at home and abroad mainly adopts AC tungsten argon arc welding, which can not only meet the cathode cleaning effect of aluminum materials, but also reduce t...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of unstable AC arc and easy arc break with small current, and at the same time, it can effectively overcome the high-frequency interference hazards existing in existing welding machines, complex circuits, difficult material selection, high power consumption and low efficiency, and low working efficiency. Defects such as instability

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