| 摘要 |
A casting (2) and feeder (1) between which there is formed a portion (20) having a reduced diameter and a height (H) to allow the end portion of a gas cutting torch to be at least partially introduced into the gap thus formed between them, the said portion (20) being formed by mounting a core, made of a heat insulating material, at the boundary of the cavities of a mould for the feeder head and the casting and pouring a molten metal into the mould. As an alternative, the feeder may be impacted to break it off. <IMAGE> |
