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Melting
Melting is caused by overheating. Mostly, the electrode surface is rather lustrous and
uneven. The melting point of nickel alloy is 1200 to 1300 °C (2200 to 2400 °F).
Erosion, Corrosion and Oxidation
The material of the electrodes has oxidised, and when the oxidation is heavy, it will be
green on the surface. The surface of the electrodes will also be fretted and rough.
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