Fast frequency-variable polarity TIG welding power source and system based on SiC module

A welding power supply and polarity-changing technology, which is applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of long tailing off time, no more than 20kHz, and irregular output current waveform, etc., and achieve dynamic response speed Ideal, guaranteed cathode cleaning effect, stable and undistorted waveform
CN114654049AActive Publication Date: 2022-06-24SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2022-06-24

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Abstract

The invention provides a fast frequency variable polarity TIG welding power source and system based on a SiC module. The welding power source comprises a double-path parallel power main circuit, a control circuit and a man-machine interaction system. The double-path parallel power main circuit comprises a three-phase rectification filter circuit, a fast frequency pulse current main circuit and a variable polarity current main circuit; each of the fast frequency pulse current main circuit and the variable polarity current main circuit comprises a primary inverter circuit, a high-frequency transformer and an ultrafast recovery rectification smoothing circuit which are connected in sequence; the fast-frequency pulse current main circuit further comprises a filter inductor and a high-frequency switching circuit which are sequentially connected behind the ultra-fast recovery rectifying and smoothing circuit. The variable polarity current main circuit further comprises a coupling inductor and a secondary inverse current conversion circuit which are sequentially connected behind the ultrafast recovery rectification smoothing circuit. The welding power source can reduce the size, is high in dynamic response speed, low in switching loss, high in energy efficiency and stable and distortionless in output waveform, and can improve the welding quality.
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Description

technical field

[0001] The invention relates to the technical field of welding equipment, and more particularly, to a fast-frequency variable-polarity TIG welding power source and system based on a SiC module. Background technique

[0002] The variable polarity welding power source plays an important role in the welding process of magnesium and aluminum alloys. Due to the high thermal conductivity and high thermal expansion coefficient of magnesium alloy, aluminum alloy and other alloys, and the surface layer is prone to oxidation to form an oxide film, DCEN (direct current connection) or DCEP (direct current reverse connection) DC tungsten inert gas shielded welding (Tungsten Inert Gas , TIG) are prone to defects such as coarse grains, slag inclusions, tungsten electrode burning, and thermal cracks. The variable polarity tungsten inert gas welding (Variable Polarity TIG, VPTIG) process has the function of cathode cleaning, which can break and clean the oxide film on the me...

Claims

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