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Electrode are some times broken due to: -
1) Electrodes making contact with a none metallic object as they are being hard pressed and ultimately broken. Electronic instruments are available to find this condition and take corrective measures to avert breakage of electrodes.
2) Scrap falling against the electrode(also known as scrap cave-in or collapse)
Above conditions are applicable for EAF
3) Electrode breaking at joints due to incorrect jointing (Not having the correct torque applied to the sections being jointed)
4) Rough handling prior to being used (While being moved or stored)
5) If thermosetting thead lock are missing due to some reason or other,the same mishap may happen.
6) Thread may have some entrapped external material which in turn damage the thread while torquing.
7) If phase sequence is not correct, electrode will be loosened from the joint and may fall in the molten metal.
vipin@vaibhavfurnaces.com
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