MANUFACTURE OF TUBULAR BODY CONTAINING TWO OR MORE LAYERS OF SPIRALLY CURVED STRIPS

摘要

FIELD: machine building.SUBSTANCE: long multilayer tubular body (1) is manufactured; it contains long inner hollow core (5), long tubular inner casing (4) and long tubular outer casing. Inner casing encloses hollow core; outer casing encloses inner casing. Otherwise, hollow core and outer casing includes at least two layers (2, 3). Each layer consists of one or more flat long metal strips pre-formed in longitudinal direction. Pre-forming of strips is performed so that strips are spirally curved and series turns of spiral or spirals touch or almost touch one another. Besides, each strip in one layer is overlapped with other strips in other layers and layers in outer casing are connected to each other by means of glue.EFFECT: reduction of corrosion cracking hazard.10 cl, 7 dwg