Process for assembling piping or components by TIG welding
US5396039A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1993 |
| Grant date | Mar 7, 1995 |
| Priority date | — |
| Expiry date | Nov 24, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/0286
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A process to avoid or limit corrosion at the junction of two piping comprising devices welded together, said piping comprising devices being adapted to flow corrosive gases through them, said process comprising the steps of: PA1 a) providing a first piping comprising device and connecting it to an inert gas source; PA1 b) purging it with an inert gas comprising substantially not more than 10 ppb of an oxidizing gas selected from the group consisting of oxygen, carbon dioxide, water vapor or mixtures thereof, said inert gas flowing from a first opening to a second opening of said piping comprising device; PA1 c) providing a second pipe comprising device in flow communication with the first one, while continuing to purge the first piping comprising device; PA1 d) welding the two piping comprising devices, said welding being carried out under an inert gas atmosphere; and PA1 e) repeating steps c and d if necessary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.