| 摘要 |
Arc-control chamber gear for contact electrodes (1, 2), the gear possessing openings (47, 48) in collars (31, 32) of an electrode centering cap (29) so as to break the confinement of the electrodes and allow them to be ventilated by gas convection between the inside volume (57) heated by the flow of current and the cooler outside volume.
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