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Image acquisition.
| Image library | Classification | Number of experiments | Number of images |
|---|---|---|---|
| Penetration | Full penetration | 15 | 1650 |
| Sag depression | 30 | 1850 | |
| Burn through | 15 | 1400 | |
| Pores | With pores | 25 | 1350 |
| No pore | 15 | 1050 | |
| Arc interference | Strong interference | 100 | 10,000 |
| Weak interference | 10 | 5300 | |
| Slags | With slags | 15 | 2250 |
| Little slag | 25 | 1950 |
