| 摘要 |
PURPOSE:To realize titled oxidation prevention without reducing the work efficiency, by providing external and internal oxidation preventing devices which are adjacent to a weld zone between external and internal electrode rolls and blow out an inert gas along a weld zone advancing path of a weld can barrel of its downstream. CONSTITUTION:An inert gas blown out of a lower opening part 14C2 of an external oxidation preventing device 7 covers the outside face of a weld point 9 and its adjacent weld zone 3a, and the inert gas blown out of a small hole covers the outside face of the weld zone 3a existing in a downstream a little from the weld point 9 and cuts off air completely. Also, leakage of the inert gas is prevented by a seal member 17 provided between a side wall part 15 being adjacent to the tip part of a leading path 14 for leading the inert gas and the circumferential edge part of an external electrode roll 1. An internal oxidation preventing device 8 is firmly fixed with a bolt 39 to an end part 6a of a mandrel 6 of a downstream of an internal electrode roll 2, and has the same structure and operation effect as the device 7. |
