WT20 thorium tungsten electrode tungsten needle commonly used chemical composition and grade

Pure tungsten carbide plate 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.
Zirconium tungsten electrode must be protected from contamination on the base metal under special conditions, you can use this tungsten. This easy to maintain the hemispherical tip of the electrode, suitable for AC welding strip, welcomed the consultationThorium tungsten electron emission capability, allowing high current density arc burning more stable, but with a certain radioactive elements thorium, promote the application be affected.
    Zirconium tungsten electrode must be protected from contamination on the base metal under special conditions, you can use this tungsten. This easy to maintain the hemispherical tip of the electrode, suitable for AC welding pieces, quality assurance, welcome to consult the discussion