Tungsten electrode and tungsten-faced electrode
Tungsten /tʌŋstən/, also known as wolfram /wʊlfrəm/, which is a chemical element with the symbol of W and atomic number 74.
Tungsten products feature high melting point(3410°C) , high creep resitance, electron emission,low thermal expansion, high resistivity, low vapor pressure, good thermal conductivity and high density.