Although there is no obvious limit to the change process of the electrode during sintering, it can be roughly divided into three stages according to the firing temperature and location.
(1) Softening stage. The temperature rises from 25°C to 120°C—200°C, about 500 mm above the conductive jaw.
(2) The volatilization stage. The temperature rises from 120°C to 200°C to 650 to 750°C, roughly in the half-ring position.
(3) Sintering stage. The temperature rises from 650-750°C to 900-1000°C. 3. Judgment of quality
Determine whether the electrode sintering is normal. If the surface of the electrode is found to be gray or dark but not red, it is baked well, if it is red, it is too dry, if it is black or smokes a lot, it is too soft. Within 10-20 minutes after the electrode is discharged, especially when the electrode is sintered and cannot keep up with the consumption, you must pay attention to the degree of redness of the electrode, whether there is oil leakage, smoke or the electrode itself “stinging” phenomenon. If you find the above phenomenon, you need to reduce the load of the electric furnace or deal with the power outage. In order to make the electrode sintering quality good, the following requirements must be met:
(1) The electrode paste that meets the quality standard and meets the requirements of lumpiness should maintain a certain height when filling.
(2) Electrode production and welding must meet the requirements, and the cooling condition of the conductive jaw plate and the contact of the electrode must be good.
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