Apparatus for continuous manufacture of butt-welded pipe
US4357512A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1980 |
| Grant date | Nov 2, 1982 |
| Priority date | — |
| Expiry date | Jul 23, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K11/0873
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An apparatus for continuous manufacture of butt-welded pipes is constituted by a heating furnace for heating a skelp continuously passed therethrough up to a predetermined temperature less than the butt-welding temperature for the material of the skelp, heaters adjacent the outlet end of the heating furnace and having spaced opposed induction heating coils on opposite sides of the path along which the skelp is passed through the heaters and adjacent the edge portions of the skelp for heating only the edge portions of the skelp discharged from the heating furnace up to the butt-welding temperature. The induction heating coils are such that the electromagnetic coupling between the induction heating coils and the corresponding edge portions of the skelp can be varied to adjust the temperature to which the edge portions are heated. A bending device adjacent the outlet end of the heaters bends the skelp into a generally tubular form, and butt-welding rolls adjacent the outlet end of the bending apparatus apply a predetermined pressure to the bent up skelp for butt-welding the edges of the skelp to each other. A cooling device along the path of the pipe between pairs of contracting rolls…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.