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Shielding gas composition and electrode geometry influence on arc properties [electronic resource].

Published
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1981.
Physical Description
Pages: 6 : digital, PDF file
Additional Creators
United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The effects of welding electrode geometry and of shielding gas composition using pure argon, argon-helium mixtures, and an argon-hydrogen mixture on welding arc properties, particularly acr temperature distribution was studied. Plasma diagnostic techniques were used to measure the arc properties presented. A computer-controlled emission spectroscopy system comprised of an Optical Multichannel Analyzer (OMA) interfaced to 0.3-m monochromator was used to make temperature and composition measurements. Electrode tip geometry was found to have a somewhat restricted influence on arc temperature distribution. The addition of significant amounts of helium to argon shielding gas causes a gas tungsten arc to be a broader, more isothermal, heat source than an arc shielded with pure argon. Blunt electrode tip geometries, compared to sharp ones, tend to cause flatter temperature distributions in pure argon but have temperature distributions similar to sharp electrode tips in moderate to high helium environments. Thermophysical properties of the shielding gas constituents appear to have greater influence on fusion zone profile than does arc temperature. However, refined heat transfer models of the future will require arc temperature distributions as a function of essential welding variables since these models will use properties which are strongly temperature dependent.
Report Numbers
E 1.99:conf-810404-1
conf-810404-1
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
01/01/1981.
"conf-810404-1"
American Welding Society conference, Cleveland, OH, USA, 6 Apr 1981.
McIlwain, M.E.; Key, J.F.
EG and G Idaho, Inc., Idaho Falls (USA)
Funding Information
AC07-76ID01570
View MARC record | catkey: 14118394