Ultrasonic square wave direct current pulse arc-welding power supply device

Abstract

The present invention discloses a super audio square wave DC pulse power supply equipment used for electric arc welding, which mainly comprises a rectification filter circuit, a peak value current producing circuit, a pulse peak value current switching circuit and a background value current producing circuit. The background value current producing circuit is used for producing the background value current Ib, and is effected on the cathode end of the power diode DP, and the peak value current producing circuit is used for producing the peak value current Ip which outputs the pulse peak value current Ipp through a fifth power switch tube TP and the power diode DP, and then the background value current Ib and the pulse peak value current Ipp are piled, thereby getting the pulse current IF to supply the electrode and workpiece. The super audio square wave DC pulse power supply equipment of the present invention can realize the pulse current frequency not less than 20 kHz, and the pulse current amplitude value is 1 to 300 A, and the ascension rate of the pulse current is not less than 50 A / Mus.

Description

technical field [0001] The invention relates to a super-audio frequency square-wave DC pulse arc welding power supply device, in particular to a super-audio frequency DC pulse power supply topology circuit suitable for arc welding. Background technique [0002] In the field of arc welding, square wave DC pulse current welding is widely used, such as pulse TIG welding, pulse MIG welding and so on. Compared with traditional DC welding, square wave DC pulse welding has remarkable features, such as control of droplet transfer, control of weld shape, control of welding line energy and so on. For DC pulse welding, the pulse frequency is one of the important parameters. For conventional DC pulse TIG and DC pulse MIG welding, the frequency is between a few tenths of a Hz and several hundred Hz. This conventional DC pulsed arc welding power supply is based on the traditional thyristor type, transistor analog type or switching (inverter) power supply, and is realized by controlling t...

AI Technical Summary

Problems solved by technology

As we all know, when arc welding is performed, the welding current is as high as hundreds of amperes, and it is very difficult to realize hundreds of amperes of super-audio frequency square wave DC pulse current technically until today.

At the same time, due to the influence of the distributed inductance of the welding circuit and its parameters, it is difficult to realize the conventional pulse arc welding power supply control technology (see Figure 1).

Even if it can be realized, its current waveform will be greatly distorted

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