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J Mater Sci Technol  2009, Vol. 25 Issue (03): 415-418    DOI:
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Mechanism of Metal Transfer in DE-GMAW
Kehai Li1), Chuansong Wu2)†
1) Center for Manufacturing, University of Kentucky, Lexington, Kentucky, 40506, USA
2) Institute of Materials Joining, Shandong University, Ji'nan, 250061, China
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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     
Received:  25 February 2008     
Fund: 

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

Corresponding Authors:  Wu Chuansong     E-mail:  wucs@sdu.edu.cn

Cite this article: 

Kehai Li,Chuansong Wu. Mechanism of Metal Transfer in DE-GMAW. J Mater Sci Technol, 2009, 25(03): 415-418.

URL: 

https://www.jmst.org/EN/     OR     https://www.jmst.org/EN/Y2009/V25/I03/415

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