Adequate shield and plasma gas flow rate during plasma arc welding are crucial factors in achieving high quality welds. Too low a shield gas flow rate lets atmosphere enter into the arc and too high a rate wastes weld gas and may cause turbulence and entrain atmosphere. Sufficient plasma gas flow is required for keyhole welding and, as shown in this paper, can reduce hydrogen contamination in the weld. In-situ optical spectroscopy used to detect oxygen and hydrogen in the welding arc during variable polarity plasma arc (VPPA) welding of aluminum 2090 revealed that there is an easily detected critical shield gas flow rate needed to exclude atmosphere and that this critical rate can be used to automatically control gas flow rates during welding.
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August 1993
This article was originally published in
Journal of Engineering for Industry
Research Papers
The Effect of Weld Gas Flow Rate on Al-Li Weldability
L. F. Martinez,
L. F. Martinez
Department of Metallurgical and Materials Engineering, University of Texas at El Paso, El Paso, TX 79968-0520
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J. C. McClure,
J. C. McClure
Department of Metallurgical and Materials Engineering, University of Texas at El Paso, El Paso, TX 79968-0520
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A. C. Nunes, Jr.
A. C. Nunes, Jr.
Materials and Processes Laboratory, National Aeronautics and Space Administration, Marshall Space Flight Center, Huntsville, AL 35805
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L. F. Martinez
Department of Metallurgical and Materials Engineering, University of Texas at El Paso, El Paso, TX 79968-0520
J. C. McClure
Department of Metallurgical and Materials Engineering, University of Texas at El Paso, El Paso, TX 79968-0520
A. C. Nunes, Jr.
Materials and Processes Laboratory, National Aeronautics and Space Administration, Marshall Space Flight Center, Huntsville, AL 35805
J. Eng. Ind. Aug 1993, 115(3): 263-267
Published Online: August 1, 1993
Article history
Received:
January 1, 1992
Revised:
June 1, 1992
Online:
April 8, 2008
Citation
Martinez, L. F., McClure, J. C., and Nunes, A. C., Jr. (August 1, 1993). "The Effect of Weld Gas Flow Rate on Al-Li Weldability." ASME. J. Eng. Ind. August 1993; 115(3): 263–267. https://doi.org/10.1115/1.2901659
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