| 摘要 |
PURPOSE:To reduce size of a preheating device of copper by welding mild steel to copper in advance and welding this mild steel to nodular graphite cast iron at the time of welding copper to the nodular graphite cast iron. CONSTITUTION:At the time of welding radiating fins to an external cylinder of a vessel(cask) to store nuclear fuel, for instance, a mild steel plate 5 is welded to an end of a copper flat plate 4 to be the radiating fins with a Cu-Si or Cu-Al alloy as welding materials 6. Continuously, a part of the mild steel plate 5 is welded to a cylinder 1 made of the nodular graphite cast iron with Fe-Ni welding materials 7. In this method, although it is necessary to preheat the copper fins 4 at the time of welding the mild steel plate 5 to the copper fins 4, since dimensions of individual copper fin 4 are not large so much, the preheating device may be of small-size. Further, the preheating is not necessary at the time of welding the fins 4 to the cylinder 1. |
