Internal resistance pipe butt welder
US4273985A · kind A · utility
Inventors
Key dates
| Filing date | May 4, 1979 |
| Grant date | Jun 16, 1981 |
| Priority date | — |
| Expiry date | May 4, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K11/0935
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A welder arranged inside pipes to be welded comprises a housing with the longitudinal axis thereof matched with the axis of the pipes. On the housing are a welding transformer and two mechanisms clamping the pipes, each having a drive moving the mechanism along the axis of the housing, and each being electrically connected to the transformer. The housing has mounted thereon a pipe flashing and upsetting mechanism with its own hydraulic drive, kinematically coupled to one of the pipe clamping mechanisms, a hydraulic pump supplying fluid to the drives, and a mechanism driving the welder along the pipes' axis. The housing carries two bearing discs secured at opposite ends and three clips mounted on roller supports and movable along the housing's axis. Two clips are incorporated in the first and second clamping mechanisms, respectively, and the third is part of the flashing and upsetting mechanism. The clip incorporated in the first pipe clamping mechanism is interposed between the bearing disc and the clip of the second clamping mechanism and is coupled to the bearing disc by means of its hydraulic drive. Another kinematic coupling is between this clip and the bearing disc. The clip o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.