Process for producing welded joint using GMA welding and CO2 as a shielding gas
US9555496B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2013 |
| Grant date | Jan 31, 2017 |
| Priority date | — |
| Expiry date | Jul 11, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/40
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A process for producing a welded joint, which includes a weld metal having high strength and high toughness, and containing fewer blowholes, includes the steps of: preparing a base material containing, by mass %, not less than 10.5% of Cr; and subjecting the base material to GMA welding using a shielding gas containing 1 to 2 volume % or 35 to 50 volume % of CO2 gas, and the balance being inert gas, thereby forming a weld metal includes, by mass %, C: not more than 0.080%, Si: 0.20 to 1.00%, Mn: not more than 8.00%, P: not more than 0.040%, S: not more than 0.0100%, Cu: not more than 2.0%, Cr: 20.0 to 30.0%, Ni: 7.00 to 12.00%, N: 0.100 to 0.350%, O: 0.02 to 0.11%, sol. Al: not more than 0.040%, at least one of Mo: 1.00 to 4.00% and W: 1.00 to 4.00%, and the balance being Fe and impurities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.