Non-contact arc ignition circuit for argon arc welding machine

Abstract

The invention provides a non-contact arc ignition circuit for an argon arc welding machine. The non-contact arc ignition circuit for the argon arc welding machine comprises a high-frequency arc ignition control circuit, a high-frequency arc ignition circuit and an auxiliary arc ignition circuit. When a welding gun is switch on, the high-frequency arc ignition control circuit processes a pulse signal HFc sent out by a control system, an audion Q1 is conducted, and current passes through the primary side of a switch K1 and the primary side of a switch K2; the secondary sides of the switch K1 andthe switch K2 of the high-frequency arc ignition circuit are closed, and alternating current of a main transformer primary side first secondary winding passes through a voltage doubling circuit and ahigh-frequency generating circuit, then passes through an arc ignition inducer and applies to an output negative electrode OUT- of a welding machine; the auxiliary arc ignition circuit processes an arc ignition signal HFc sent out by the control system, an MOS tube Q4 is conducted, and alternating current of a main transformer primary side second secondary winding is rectified through a diode D12and then is applied to an output positive electrode OUT+ of the welding machine through the MOS tube Q4; and consequently, an arc is ignited. With the adoption of the non-contact arc ignition circuitfor the argon arc welding machine, electromagnetic interference and arc ignition noise during arc ignition can be reduced substantially, and the success rate of the arc ignition is increased.

Description

technical field [0001] The invention relates to a circuit in an electric welding machine, in particular to a non-contact arc starting circuit for an argon arc welding machine. Background technique [0002] At present, there are two ways to start the arc of the argon arc welding machine. One is contact arc ignition. This arc ignition method has a simple circuit, but it is easy to cause tungsten in the weld seam when the arc is struck. The loss of the tungsten needle is large and the quality of the weld seam is affected. Another arc starting method is non-contact arc starting, which uses high frequency and high voltage to break down argon gas to achieve the purpose of arc starting. This kind of arc starting method can solve the problem of tungsten inclusion in the weld seam. However, the traditional non-contact arc ignition uses a high-voltage package as the arc ignition circuit, which has the disadvantages of large electromagnetic interference, large arc ignition noise, and ...

AI Technical Summary

Problems solved by technology

However, the traditional non-contact arc ignition uses a high-voltage package as the arc ignition circuit, which has the disadvantages of large electromagnetic interference, large arc ignition noise, and low arc ignition success rate.

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