Sine wave high-frequency pulse TIG welding power supply

Abstract

The invention relates to the technical field of welding power supplies, in particular to a sine wave high-frequency pulse TIG (tungsten inert gas) welding power supply which comprises an IGBT (insulated gate bipolar transistor) direct-current conversion circuit and an IGBT alternating-current conversion circuit. The IGBT direct current conversion circuit comprises a first inverter circuit, a first transformer and a full-wave rectification circuit; the IGBT alternating current conversion circuit comprises a second inverter circuit and a second transformer; after the direct current is converted by the two inverter circuits, two alternating-current sine-wave voltages are respectively obtained, the two alternating-current sine-wave voltages are subjected to voltage reduction by the two transformers, first reduced voltage and reduced alternating-current sine-wave voltages are respectively obtained, the first reduced voltage is rectified by the full-wave rectification circuit, and direct-current sine-wave voltages are obtained. According to the high-frequency welding TIG power supply, the current waveform finally output by the high-frequency welding TIG power supply is sine waves through the first inverter circuit and the second inverter circuit, electric arcs are compressed through the high-frequency electromagnetic effect, and the stiffness and heat efficiency of the electric arcs are improved.

Description

technical field [0001] The invention relates to the technical field of TIG welding power sources, in particular to a sine wave high-frequency pulse TIG welding power source. Background technique [0002] TIG welding (Tungsten Inert Gas Welding, tungsten inert gas welding) has the characteristics of stable arc, no spatter, good welding quality (pure weld, beautiful shape, small heat affected zone), and can weld almost all alloys or metals. Widely used in various fields of industry. However, TIG welding arc heat dispersion, low energy density, small arc force and the tungsten electrode is affected by the allowable current, which limit the application of this method in medium and thick plates and high efficiency. In order to solve the problems of shallow penetration and low efficiency in traditional TIG welding, a high-frequency DC pulse TIG welding method has been proposed. Thermal efficiency. [0003] Current pulse frequencies in the audio range such as several kHz to 20 k...

AI Technical Summary

Problems solved by technology

The current pulse frequency generally works above 20kHz. When the pulse current is small (30A), with the pulse frequency Due to the increase of the loop inductance (U=L di / dt, where U is the self-induced electromotive force, L is the loop inductance), the amplitude of change and the rate of change di / dt of the pulse current are limited. The wave pulse is actually a sawtooth wave, which limits the improvement of arc temperature and thermal efficiency

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