Journal of South China University of Technology (Natural Science Edition) ›› 2008, Vol. 36 ›› Issue (4): 14-17,22.

• Mechanical Engineering • Previous Articles     Next Articles

Droplet Transfer Control in PFM-Based Average Pulsed MAG Welding Using Current Modulation

Wu Kai-yuan  Huang Shi-sheng  Li Xing-lin  Wu Shui-feng     

  1. School of Mechanical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2007-04-27 Revised:2007-08-02 Online:2008-04-25 Published:2008-04-25
  • Contact: 吴开源（1978-），男，博士后，主要从事机电一体化技术、弧焊逆变电源及其数字化智能控制的研究． E-mail:wuky@scut．edu．cn
  • About author:吴开源（1978-），男，博士后，主要从事机电一体化技术、弧焊逆变电源及其数字化智能控制的研究．
  • Supported by:

    国家自然科学基金资助项目（50375054）;中国博士后科学基金资助项目（20060400745）

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Abstract:

One droplet per pulse is the most ideal mode of droplet transfer for pulsed metal active gas （MAG） welding. In order to meet the requirements of this transfer mode, this paper adopts constant peak and base phases to implement the current external characteristics, and uses the pulse frequency modulation （PFM） combined with the high-frequency inverter and the DSP digital control to adjust the average current and to further control the melting velocity of the welding wire. Thus, the difficulty in the arc length control is overcome. Experimental results indicate that the PFM-based average current modulation implements the droplet transfer control of pulsed MAG welding with high stability and good welding quality.

Key words: pulsed metal active gas welding, droplet transfer, pulse frequency modulation, current modulation