The electrode holder should be held in the place beyond the security line of the top electrode; otherwise, the electrode would be easily broken the contact surface between the hoider and the electrode should be cleaned up regularly to maintain a good contacting, the cooling jacket of the holder shall be avoided from water leakage.
Avoid of collapsing the furnace lid when rising or dropping the electrodes,which may result in electrode damage.
It is necessary to prevent the steel slag from splashing to the threads of the electrodes or nipple stored in the smelting site,which may damage the precision of the threads.
Identify the reasons it there is gap in the electrode junction, do not use them until the gap is eliminated.
If there is falling off of nipple bolt when connecting electrodes,it is necessary to complete the nipple bolt
The application of electrode should avoid of tilting operation, particularly , the group of connected electrodes should not be put horizontally so as to prevent from breaking.
When charging materials to the furnace,the bulk materials should be charged to the place of the furnace bottom,so as to minimize the impact of the large furnace materials on the electrodes.
The large pieces of insulation materials should be avoided of stacking on the bottom of the electrodes when smelting so as to prevent from affecting the electrode use,or even broken.
1. Wet graphite electrodes must be dried prior to use.
2. The foam protective caps on the electrodes socket shall be removed to verify the integrity of the internal threads of the electrode socket.
3. The surfaces of the electrodes and the internal threads of the socket shall be cleared by compressed air free of any oil and water. No steel wool or metal sand cloth shall be used in such clearance.
4. The nipple must be screwed carefully into the electrode socket of one end of the electrode without collision with the internal threads (it is not suggested to directly put the nipple into the electrode removed from the furnace).
5. The lifting appliance (it's preferred to adopt graphite lifting appliance) should be screwed into the electrode socket of the other end of the electrode.
6. When lifting the electrode,cushion-like materials must be put on the ground under the connecting end of the electrode to avoid and collision. After the lifting hook has been put into the ring of the lifting appliance, the electrode shall be lifted smoothly to prevent it from falling or colliding with any other fixture.
7. The electrode shall be lifted above the head of the working electrode and dropped slowly aiming at the electrode socket, then the electrode will be screwed to make the helical hook and the electrode declining and turning together, when the distance between the end faces of two electrodes is 1020mm, the two end face of the electrodes and the outer part of the nipple must be cleared again by compressed air. Finally, the electrode must be laid gently, or the threads of the electrode socket and nipple will be damaged because of the violent collision.
8. Use torque spanner to screw the electrode until the end faces of the two electrodes contact closely (the gap of correct connection between the electrodes is less than 0.05mm)
Graphite electrodes are high-purity carbon conductive consumables. They conduct electric current to generate high-temperature arc for melting steel and non-ferrous metals in electric arc furnaces.
Mainly RP (Regular Power), HP (High Power), UHP (Ultra-High Power), classified by current-carrying capacity. UHP graphite electrodes are widely used for large-capacity electric arc furnaces.
Moisture inside electrodes will vaporize rapidly under high temperature, which may cause electrode cracking or breakage during furnace operation.
Remove protective foam caps, check whether internal threads and end faces are complete and free of cracks. Clean threads and end faces with oil-free & water-free compressed air. Do NOT use steel wool or metal abrasive cloth.
Screw the nipple carefully without hitting threads. Do not fit nipples into electrodes directly taken out from hot furnace. Apply torque spanner; the connection gap between two electrode end faces shall be less than 0.05 mm.
Common reasons: damp electrode without drying, thread damage from violent collision, improper torque value, mechanical impact, excessive current load.
Store in dry & ventilated warehouse. Keep away from rain and moisture. Place cushion under electrodes to avoid direct contact with wet ground.
Shuangjing Village, Ligezhuang Town, Jiaozhou City, Qingdao City, Shandong Province, China
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