Multiple welding head system for fabricating pipe
US4143801A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 9, 1977 |
| Grant date | Mar 13, 1979 |
| Priority date | — |
| Expiry date | Feb 9, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L1/202
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A pipe is fabricated from rolls of flat metal plate by continuously moving the plate into a pipe-forming station which shapes the flat plate into a pipe having a longitudinal seam therealong. A plate arc welding machine welds consecutive plates to each other thereby maintaining continuity of plate movement. Equal sections of the longitudinal seam are consecutively welded in a leapfrogging manner using two welding units movably positioned on the opposite sides of the moving pipe. The welding units alternatingly weld alternate and overlapping sections of the longitudinal seam. The welding operations are carried out without interference with the continuous movement of the pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.