Cerium Tungsten Electrode Formation And Characteristics

Cerium tungsten electrodes in tungsten adding rare earth cerium oxide powder metallurgy and rolling through grinding and polishing process made of tungsten electrode products, is the earliest production of non-radioactive tungsten electrodes product that is characterized by the low current conditions has excellent arc performance , dimensional arc current is small . Therefore, it is commonly used in pipes, stainless steel products and welding of small precision parts . Conditions at low current DC electrode diameter 2.0mm or less , cerium tungsten electrodes thorium tungsten electrode is preferred alternatives.

Grade , Composition, Color , Work Function

Model grades Added Impurity Impurity quantity% doping doping % Other Impurities% of its

He miscellaneous mass % Tungsten% tungsten % Electric discharged power Color sign electron work function color

WC20 CeO2 1.80-2.20 <0.20 margin The rest 2.7-2.8 Ash Grey

The advantage is cerium tungsten X- ray dose and antioxidant properties than thorium tungsten have been greatly improved ; electronic thorium tungsten electrode work function than about 10 %, the arc easier and better arc stability . Also cerium tungsten chemical stability, cathode spot is small, low pressure drop, burning and less , so is the most widely used TIG welding a tungsten electrode . Commonly used tungsten chemical composition and grade of pure tungsten W1 W ≥ 99.92 SiO2 ≤ 0.03 Fe2O3Al2 ≤ 0.03 Mo ≤ 0.01 CaO thorium tungsten 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 , is currently a commonly used electrodes of pure tungsten high melting and boiling points , easy to melt volatile , burning, cutting-edge , less pollution, but the electron emission is poor, is not conducive to the stability of 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 on the need to prevent contamination of the base metal under special conditions , you can use this tungsten . This is easy to maintain the hemispherical tip of the electrode , suitable for AC welding .


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