| 摘要 |
The steel core (1) consisting of a non-rust-resistant steel bar inside a tubular casing (2) made of stainless steel. The bar thereby formed is cut off into the required lengths. The core is partially ejected from the casing, and the ejected part cut off. The core is then pushed back by half the distance of the ejected and cut off part. The open casing ends (6) are closed by inserting stainless steel round discs (9) which are welded in, alternatively, the open casing ends are closed by a plastics plug (7). |
