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Flexible-transition high-low-frequency double-pulse MIG welding waveform modulating method and system

A modulation method and high-frequency pulse technology, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve unfavorable double pulse waveform flexible modulation and fine control, unfavorable welding stability and welding quality, strong electromagnetic interference Oscillation peaks and other problems can be achieved to reduce the phenomenon of broken arc and cold plate top wire, enhance the anti-interference ability, and improve the effect of energy transition form

Pending Publication Date: 2020-03-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, SiC power switch tubes are often accompanied by strong electromagnetic interference and oscillation spikes in high-frequency and high-voltage applications, which is not conducive to flexible modulation and fine control of double pulse waveforms.
In addition, the traditional double-pulse MIG welding is limited by analog control or simple digital control, and still adopts the method of vertical transition to achieve the alternation of strong and weak pulse groups. Arc and other defects are not conducive to the further improvement of welding stability and welding quality

Method used

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  • Flexible-transition high-low-frequency double-pulse MIG welding waveform modulating method and system

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Embodiment 1

[0042] This embodiment is a flexible transition high-low frequency double-pulse MIG welding waveform modulation method and modulation system. This embodiment uses a high-low frequency double-pulse MIG welding power supply circuit based on SiC power devices as an example for illustration.

[0043] Such as figure 1 As shown, the working principle of the high-low frequency dual-pulse MIG welding power supply circuit based on SiC power devices is: first, the three-phase AC power is converted into DC bus voltage by the three-phase filter and rectifier circuit; the switching tubes M1~M4 in the full-bridge inverter circuit It is a SiC power switch tube. M1, M3, M2, and M4 are alternately driven and turned on by an independent gate drive circuit. The switching frequency is 200kHz, which realizes the inverse conversion of direct current, and transfers the energy to the secondary through the high-frequency transformer T1. Secondary AC power is output through full-wave rectification and ...

Embodiment 2

[0066] This embodiment is a flexible transition high-low frequency dual-pulse MIG welding waveform modulation method and modulation system. This embodiment is applied to a welding power supply based on Si-based power devices; the output end of the SiC high-frequency drive module is connected to the Si-based welding power supply circuit. Power switch tube. The rest of the structure of this embodiment is the same as that of Embodiment 1.

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Abstract

The invention provides a flexible-transition high-low-frequency double-pulse MIG welding waveform modulating method. The method is characterized by including the steps of setting a high-low-frequencyflexible-transition double-pulse MIG welding waveform into a trapezoidal wave high-low-frequency double-pulse current waveform or a sine wave high-low-frequency double-pulse current waveform, generating feature parameters, generating a high-frequency pulse time sequence and a low-frequency pulse time sequence, establishing a double-pulse waveform control sub-task, updating a current set value according to a current waveform variation rule, obtaining a current feedback value output by a welding power supply in real time, processing the current set value and the current feedback value through aPID algorithm to obtain a regulating variable, and driving the welding power supply according to the regulating variable. By means of the modulating method, precise waveform output control can be realized, the energy transition form of double-pulse strong and wave pulse groups can be improved, the current interruption and jackscrew cold drawing phenomena in the welding process can be effectively reduced, and the welding stability is improved. The invention further provides a modulating system for implementing the modulating method.

Description

technical field [0001] The invention relates to the technical field of welding equipment, more specifically, to a flexible transition high and low frequency double pulse MIG welding waveform modulation method and system. Background technique [0002] Double-pulsed Metal Inert Gas Welding (Double-pulsed Metal Inert Gas Welding, referred to as DPMIG), has the advantages of low spatter, high welding quality, wide welding range, and easy automation. Compared with single-pulse welding, double-pulse welding introduces low-energy pulse groups, which reduces the input of linear energy, and can realize the transition of jet flow from one pulse to one drop, forming a regular fish-scale weld. The dynamic characteristics have higher requirements. [0003] Using the third-generation wide bandgap semiconductor device SiC power switch tube can break through the dynamic performance limit of traditional Si-based devices, increase the inverter frequency to 200kHz, and can output high-frequen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/09B23K9/167
CPCB23K9/091B23K9/167
Inventor 王振民陈浩宇吴健文徐孟嘉张芩
Owner SOUTH CHINA UNIV OF TECH
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