| 摘要 |
For internally supporting two tubular elements (1a, 1b) during welding by means of a heatable welding device (2), arranged on the outer circumference, a destructible, heat-resistant ring (3) is arranged on the inside at the welding point. This ring (3) consists either of a brittle material which can be destroyed from the outside by a blow, such as for example glass or ceramic, or of a water-soluble material, such as for example, salt or urea, which is dissolved and thus removed when the pipeline is flushed with water. <IMAGE> |
