When machining steel,fundamentally different conditions exit compared with machining hard metal.A much higher rate of removal can be obtained when roughing steel. If one is dealing with high-precision parts,complicated geometrical shapes,slender,fragile patterns and parts,on which great demands are made as regards surface quality,Plansee-ELRO tungsten copper electrodesare more economical than copper and graphite electrodes.

Eroding behaviour
1.Rate of removal
Under roughing conditions the removal rate with copper electrodes is higher.But this situation is reversed as soon as finishing conditions are invol-ved(see table of setting parameters,and example cited from it).

2.Wear
Because of the extremely high melting and vapoursing temperatures (3410℃ and 5930℃)of tungten,the life of tungsten copper electrodes is generally many times that of copper electrodes.For this reason one tungsten-copper electrode suffices instead of several copper or graphite electrodes.

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