FIELD: metallurgy.
SUBSTANCE: method includes forming edge portions of a sheet, forming a hollow blank from the sheet, and welding the edges with a longitudinal seam. Elimination of metal pipes damage in areas close to the seams is provided by the fact that when forming the edge portions of the sheet from which a pipe is formed, these sections are provided with larger value of curvature than the nominal curvature of the pipe. In these sections, the curvature equals to 1.04-1.10 of the pipe curvature. The portions of increased curvature are moulded over the length equal to (4.0÷5.0) h, where h is thickness of sheet, and the same length of transition zones is provided from the portions of increased curvature to the sections of nominal curvature of the pipe.
EFFECT: production of welded pipes with longitudinal weld seam.
2 cl, 5 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF WELDED PIPELINES MANUFACTURE | 2016 |
|
RU2653381C1 |
| METHOD OF A LARGE DIAMETER WELDED PIPE EXPANDING, MANUFACTURED BY BENDING FROM A SHEET AND BY LONGITUDINAL WELDING | 2016 |
|
RU2647062C1 |
| PIPELINES MANUFACTURING METHOD | 2017 |
|
RU2683099C1 |
| TUBE PRODUCTION METHOD | 1999 |
|
RU2162758C2 |
| METHOD OF PIPELINE MANUFACTURING BY WELDING OF PIPES | 2016 |
|
RU2647063C1 |
| HEAT-EXCHANGE APPARATUS | 2003 |
|
RU2260159C2 |
| MACHINE FOR STRAIGHTENING CURVED PIECES SHAPED AS CIRCULAR ARC BY REVERSE ELASTOPLASTIC BENDING | 2015 |
|
RU2593545C1 |
| METHOD OF PRODUCING WELDED CYLINDRICAL ARTICLES | 0 |
|
SU910274A1 |
| METHOD OF ROLLING SHEETS | 0 |
|
SU1477486A1 |
| METHOD OF PRODUCING LARGE-DIAMETER LONGITUDINAL WELDED PIPES | 2014 |
|
RU2571298C2 |
