J. Mater. Sci. Technol. ›› 2009, Vol. 25 ›› Issue (03): 415-418.

• Letters • 上一篇    下一篇

Mechanism of Metal Transfer in Double-Electrode GMAW

武传松   

  1. 山东大学
  • 收稿日期:2008-02-25 出版日期:2009-05-28 发布日期:2009-10-10
  • 通讯作者: 武传松
  • 基金资助:

    国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金

Mechanism of Metal Transfer in DE-GMAW

Kehai Li1), Chuansong Wu2)†   

  1. 1) Center for Manufacturing, University of Kentucky, Lexington, Kentucky, 40506, USA
    2) Institute of Materials Joining, Shandong University, Ji'nan, 250061, China
  • Received:2008-02-25 Online:2009-05-28 Published:2009-10-10
  • Contact: Wu Chuansong
  • Supported by:

    the National Science Foundation of USA under grant DMI-0355324
    the National Natural Science Foundation of China under grant No. 50675119

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Abstract:

Modification of conventional gas metal arc welding (GMAW) process is of great potential to achieve high productivity with low cost and strong usability. Double-Electrode GMAW (DE-GMAW) is such a modified arc welding process which is formed by adding a bypass torch (gas tungsten arc welding torch) to a conventional GMAW system. The mechanism of metal transfer in DE-GMAW was proposed and verified in this paper. Experiments show that the critical current is decreased so that spray transfer can be obtained at a lower current level in DE-GMAW. Analysis of this significant change in metal transfer phenomena is conducted, and explanation is given out. It is found that the bypass arc in DE-GMAW lifts the anode point on the droplets such that the electromagnetic force becomes larger and squeezes the droplets so that spray transfer can take
place under welding current lower than that in conventional GMAW.

Key words: Metal transfer, Double-electrode GMAW, Mechanism