IMPROVED METHODS OF CREATING AN ELECTROFUSION CONNECTION Russian patent published in 2018 - IPC B29C65/34 F16L47/03 B29C65/82 B29L23/00 B29L9/00 

FIELD: machine engineering.

SUBSTANCE: group of inventions relates to methods for creating electrofusion compounds providing continuity and reproducibility of welds between electrofusion fitting and inner coating of a tube (or a separate pipe). The electrofusion fitting for connecting the sections of the tube having the inner coating has heating elements for creating at least one weld connection between the electrofusion fitting and inner coating of a tube, however, prior to the welding stage, the electrofusion fitting is heated and expanded to provide contact with the inner coating of the tube. Preheating of the electrofusion fitting also provides predetermined initial temperature for the fitting and the inner coating.

EFFECT: increased reliability of fusion cycle and elimination of need for clamps or support frames to support the electrofusion fitting at the work area, thereby the duration of cycles is shortened, and level of complexity is decreased.

25 cl, 4 dwg