Method of welding for exfoliation prevention of stainless steel weld-overlay
US4224360A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1979 |
| Grant date | Sep 23, 1980 |
| Priority date | — |
| Expiry date | Feb 9, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12979
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A welding method for stainless steel overlays is disclosed wherein a welded stainless steel overlay is prevented from exfoliating out of an inner surface of a high pressure vessel. Hydrogen exists at a partial pressure of less than 150 kg/cm.sup.2 and a temperature less then 450.degree. C. in the pressure vessel. At least one low alloy steel weld-overlay is preliminarily welded over the inner surface of the pressure vessel. The preliminarily low alloy steel weld-overlay is composed of similar composition to the base metal of the vessel, containing niobium and/or nickel. Thereafter, at least one customary ferritic steel or austenitic steel weld-overlay is welded thereon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.