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WANG Zhenmin, JIA Jianjun, HU Jianliang, LIAO Haipeng, WU Jianwen, ZHANG Qin. Research on local dry underwater fast-frequency pulsed MIG welding power supply[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(4): 13-19. DOI: 10.12073/j.hjxb.20230620002
Citation: WANG Zhenmin, JIA Jianjun, HU Jianliang, LIAO Haipeng, WU Jianwen, ZHANG Qin. Research on local dry underwater fast-frequency pulsed MIG welding power supply[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(4): 13-19. DOI: 10.12073/j.hjxb.20230620002
shu

Research on local dry underwater fast-frequency pulsed MIG welding power supply

  • 1.

    School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510641, China

  • 2.

    School of Computer Science & Engineering, South China University of Technology, Guangzhou, 510006, China

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  • Received Date: June 19, 2023
  • Available Online: February 21, 2024
    Graphical Abstract
    • Abstract

  • Aiming at the ultra-high dynamic characteristics and precise control requirements of welding power supply in the extremely complex underwater environment, the main circuit of fast-frequency pulsed welding power supply based on SiC module is designed, an all-digital control system is developed, and the local dry underwater fast-frequency pulsed MIG (LDU-FFPMIG) welding power supply is exploited. The welding power supply has a rated output current of 400 A, which can accurately output fast-frequency pulsed current waveforms with the fast-frequency frequency of 0~30 kHz and the fast-frequency current amplitude of 200 A. A new LDU-FFPMIG process is proposed, and the fast-frequency pulsed is applied to perform 304 stainless steel local dry underwater MIG welding, the influence of fast-frequency pulsed on local dry underwater pulsed MIG welding is revealed. The results show that the self-developed LDU-FFPMIG welding power supply achieves stable local dry underwater MIG welding and good weld formation. The introduction of fast-frequency pulsed current significantly improves arc energy density and arc stability, reduces the melting width (B), increases the penetration depth (H), reduces the weld forming coefficient (B/H) by about 30%, and refines the grain.

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    • References (17)
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