Commonly used tungsten chemical composition and grade

 Pure tungsten electrode W1 W ≥ 99.92 SiO2 ≤ 0.03 Fe2O3Al2 ≤ 0.03 Mo ≤ 0.01 CaO
    Thoriated tungsten electrode WTH-7 W margin other impurities is not more than the total mass fraction of 0.15%
    Cerium tungsten WCe-20 W margin CeO1.8-2.2 SiO2 ≤ 0.06 Fe2O3AI2O3 ≤ 0.02 Mo ≤ 0.01 CaO ≤ 0.01
    Cerium tungsten low electron work function, high chemical stability, allowing current density, non-radioactive, are now widely used in an electrode of pure tungsten high melting and boiling points, easy to melt evaporation, burning, cutting-edge, less pollution, However, poor electron emission, is not conducive to the stability of the arc burning.
    Thorium tungsten electron emission capability, allowing high current density arc burning more stable, but with a certain radioactive elements thorium, promote the application be affected.
Radioactive materials. Electron emission capacity than thorium tungsten carbide plate high arc voltage is low, stable arc. Positive polarity, the allowable current density than thorium tungsten high 5% -8%, AC allowable current density, long life, suitable for DC or AC welding, and uses the same amount of time in the case of longer than thoriated tungsten. Typically used for carbon steel, stainless steel, titanium and other metal welding. Mixing quality grade ingredients Composition oxide CeO2 added impurities% ≤ 0.02% 1.80-2.20% margin Remainder of tungsten
WT20 thorium tungsten electrode WC20 cerium tungsten electrodes WP orchid pure tungsten electrode tungsten electrodes WL15 WL20 (lanthanum tungsten 20 #) WZ8 (zirconium tungsten 8 #)
Cerium Cerium tungsten rod tungsten needle commodity information
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