FIELD: mechanical engineering.
SUBSTANCE: invention relates to the field of mechanical engineering, and in particular to methods and devices for the permanent connection of pipes by welding. Corrosion-resistant bushing of the internal protection of pipelines consists of the base of the bushing, flared from the ends. Centering stops are made in the middle part. From the edges of the sleeve to its center, a thermally expanding layer is applied with the possibility of sealing its central part. A thermally insulating layer is applied to the central part of the sleeve to protect the thermally expandable layer from thermal effects during welding.
EFFECT: possibility of increasing the reliability of protection of the welded seam and the near-weld space of the pipeline from corrosion is achieved.
3 cl, 2 dwg
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