Study on Gas-Tungsten-Arc Electrode (Report 1) : Comparative Study of Characteristics of Oxide-Tungsten Cathode(Welding Physics, Process & Instrument)
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A comparative study has been made of characteristics of gas-tungsten-arc (GTA) cathodes, consisting of tungsten mixed with a small quantity of La-, Y-, Ce-, Th-, Zr- and Mg-oxides respectively and pure-tungsten. Arc starting characteristics, arc pressure, electrode consumption, change in shape due to long term operation and incompleteness of inert gas shielding, and electrode temperature are compared in direct current electronegative polarity, and it is shown the superiority of La-oxide, Y-oxide and Ce-oxide electrodes in those characteristics. Direct observation of cathode tip by microscope during arc burning is carried out and important phenomena concerning the formation of tungsten "rim" at the periphery of cathode area, which governs the durability of electrode and the stability of arc, are studied.
- Transactions of JWRI
Transactions of JWRI 15(1), 13-19, 1986-07