Processing procedures for graphite materials
1) Graphite oil immersion. Before machining, graphite materials should be immersed in engine oil for dozens of hours to allow the oil to penetrate the graphite material so that ash powder will not fly during machining and a smoother surface can be obtained.
2) Paint and line drawing. After the electrode is roughly machined on the outer surface, a thin layer of white paint is sprayed on the line drawing surface before line drawing, so that the lines are clear and easy to machine.
3) Perform mechanical processing.
Allowable parameters of graphite electrodes
| Nominal Diameter | Actual Diameter | Nominal Length(mm) | ||
| mm | Inch | Max(mm) | Min(mm) | |
| 75 | 3 | 78 | 73 | 1000 |
| 100 | 4 | 103 | 98 | 1200 |
| 150 | 6 | 154 | 149 | 1500-1800 |
| 200 | 8 | 205 | 200 | 1500-1800 |
| 225 | 9 | 230 | 225 | 1500-2100 |
| 250 | 10 | 256 | 251 | 1500-2100 |
| 300 | 12 | 307 | 302 | 1500-2100 |
| 350 | 14 | 357 | 352 | 1500-2400 |
| 400 | 16 | 409 | 403 | 1500-2400 |
| 450 | 18 | 460 | 454 | 1500-2400 |
| 500 | 20 | 511 | 505 | 1800-2700 |
| 550 | 22 | 562 | 556 | 1800-2700 |
| 600 | 24 | 613 | 607 | 2100-2700 |
| 650 | 26 | 663 | 657 | 2100-2700 |
| 700 | 28 | 714 | 708 | 2100-2700 |
| 750 | 30 | 765 | 759 | 2400-2700 |
| 800 | 32 | 816 | 810 | 2400-2700 |
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