Abstract
This work was carried out on one standard electrode (W-ThO2,) and other electrodes developed by additions of La2O3, CeO2, and Y2O3,. The effect of rare-earth metal oxides on GTAW electrode phenomena, concerning electrode temperature, emissivity, and work function, was analyzed and compared from the point of view of those oxides' behavior during arcing. The experimental results indicate that the electrode temperature, emissivity, and work (unction .strongly depend on the behavior of the rare-earth metal oxides during arcing. The investigation demonstrates good stability of La2O3 during arcing compared with the other oxides. The temperature distributions along the electrode axis of these electrodes were measured by using infrared pyrometer and grooved electrodes. The W-La2O3 electrode showed the lowest temperature values, followed by W-CeO2 and W-ThO2 electrodes in that order. Also W-La2O3 electrodes have a higher emissivity and lower work Junction, followed by W-CeO2 and W-ThO2 electrodes in that order.
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References
L. P. Winsor and R. R. Turk,Weld. J. 36, 113 (1957).
N. A. Chapin, J. D. Cobine, and C. J. Gallagher,Weld. J. 30, 529 (1951).
M. G. Fey and J. McDonald, A, I.Ch.E. Plasma Processing Symposium, 1976.
A. E. Guile,IEE Rev. 118, 1131 (1971).
A. E. Guile and B. Juttner,IEEE Trans. Plasma Sci. PS8/3, 259 (1980).
J. V. R. Heberlein,Plasma Processing and Synthesis of Materials, J. Szekely and D. Apelian, eds., North-Holland, New York (1984), Vol. 30, p. 101.
E. Pfender,Plasma Processing and Synthesis of Materials, J. Szekely and D. Apelian, eds., North-Holland, New York (1984), Vol. 30, p. 13.
M. Ushio,Pure Appl. Chem.,60, 809 (1988).
M. Ushio, A. A. Sadek, and F. Matsuda, HW Asian Regional Welding Congress, Australia, 1988, Vol. 2, p. 989.
G. V. Samsonov,The Oxide Handbook, 2nd edn., IFI/Plenum, New York (1982).
S. W. H. Yih and C. T. Wang,Tungsten: Sources, Metallurgy, Properties and Applications, Plenum Press, New York (1979).
C. J. Smithelles,Tungsten: A Treatise on Its Metallurgy, Properties and Applications, 3rd edn., Chapman and Hall, London (1952).
G. D. Rieck,Tungsten and Its Compound, 1st edn., Pergamon Press, Oxford (1967).
F. Matsuda, M. Ushio, and H. Fujii,Trans Jpn. Weld. Res. Inst. 15, 7 (1986).
K. Kudo,The Fundamental and Method of Dispersion of Light, Ohm-sha, 1980, (in Japanese).
J. C. Devos,Physica 20, 669 (1954).
A. V. Pustogarov,Variation of Electrode Temperature in the Plasma Torch, Nauka, Novosibirsk (1977).
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Ushio, M., Sadek, A.A. & Matsuda, F. Comparison of temperature and work function measurements obtained with different GTA electrodes. Plasma Chem Plasma Process 11, 81–101 (1991). https://doi.org/10.1007/BF01447035
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DOI: https://doi.org/10.1007/BF01447035