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RESEARCH PAPERS

Workpiece Cleaning During Variable Polarity Plasma Arc Welding of Aluminum

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

Metallurgical and Materials Engineering Dept., University of Texas at El Paso, El Paso, TX 79968

A. C. Nunes

NASA, Marshal Space Flight Center, AL 35812

J. Eng. Ind 116(4), 463-466 (Nov 01, 1994) (4 pages) doi:10.1115/1.2902129 History: Received January 01, 1992; Revised September 01, 1993; Online April 08, 2008

Abstract

Variable Polarity Plasma Arc welding has proved to be extremely successful in welding aluminum alloys despite their adherent refractory oxide. This success has been attributed to removal of the oxide during the reverse polarity cycle. In situ optical spectroscopy is used to measure the amount of hydrogen and oxygen in the plasma arc with a minimum detectable limit of less than 100 ppm. It was found that the amount of contamination is independent of surface preparation and torch speed. Using this information, it is proposed that the predominant mechanism for reverse polarity cleaning in aluminum is dielectric breakdown of the surface oxide ahead of the torch rather than by ion sputtering.

Copyright © 1994 by The American Society of Mechanical Engineers
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