Apparatus for processing welded joint parts of pipes
US4491001A · kind A · utility
109Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1982 |
| Grant date | Jan 1, 1985 |
| Priority date | — |
| Expiry date | Dec 21, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D7/04
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Tensile residual stress in an annular welded joint part joining the ends of unit pipes is mechanically removed by applying repeated hammering strokes against the inner surface of the pipes over the entire joint part, thereby to cause such part to undergo local plastic deformation. The repeated hammering strokes, which have a peening effect, are applied by several automatically operating hammering devices mounted radially on a rotary head secured to and unitarily moving with a shaft which is driveable in rotation about its axis and in translation in its axial direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.