Narrow groove welding method, and welding apparatus for practicing the method
US4035605A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1975 |
| Grant date | Jul 12, 1977 |
| Priority date | — |
| Expiry date | Aug 19, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/038
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The front and rear surfaces of plates to be butt-welded are slidably held by front and rear backing shoes, respectively, for defining a welding space in a narrow groove formed by the edges of the plates, and the edges are melted by a plasma arc generating torch, while a plurality of consumable electrodes are fed into the welding space are molten by arcs generated therebetween. The backing shoes, the torch, and the consumable electrodes are moved along the groove to obtain a butt-weld of high quality at high efficiency. In addition, the electrode of the torch has an elongated configuration in section at its end portion, and its restraining nozzle surrounding the electrode has a nozzle opening which also has an elongated configuration in correspondence to the end portion of the electrode. The longitudinal axes of these configurations are aligned with each other to effectively utilize the energy of a plasma arc generated by the torch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.