Spectroscopic Measurements of Hydrogen and Oxygen in Shielding Gas During Plasma Arc Welding

[+] Author and Article Information
Q. Pang, T. Pang, J. C. McClure

The Department of Metallurgical and Materials Engineering, University of Texas at El Paso, El Paso, TX 79968

A. C. Nunes

National Aeronautics and Space Administration, Marshall Space Flight Center, Huntsville, AL 35812

J. Eng. Ind 115(1), 145-148 (Feb 01, 1993) (4 pages) doi:10.1115/1.2901628 History: Received September 01, 1991; Revised April 01, 1992; Online April 08, 2008


In Situ optical spectroscopy has been used on plasma arc welded 2219 aluminum to measure both the average temperature of and the amount of hydrogen and oxygen in the welding arc. Hydrogen and oxygen levels of less than 75 ppm can be readily detected. It is shown that below a critical shield gas flow rate, the rapid invasion of atmosphere can be readily detected by this technique, and that this critical flow rate is dependent on the temperature of the arc.

Copyright © 1993 by The American Society of Mechanical Engineers
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