Spot welded joint and spot welding method
US9610648B2 · kind B2 · utility
3Cited by
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14Claims
0Family size
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Key dates
| Filing date | Sep 18, 2014 |
| Grant date | Apr 4, 2017 |
| Priority date | — |
| Expiry date | May 27, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12965
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Provided is a spot welded joint (10) which includes at least one thin steel plate with a tensile strength of 750 MPa to 1850 MPa and a carbon equivalent Ceq of equal to or more than 0.22 mass % to 0.55 mass % and in which a nugget (3) is formed in an interface of the thin steel plates (1A, 1B). In a nugget outer layer zone, a microstructure consists of a dendrite structure in which an average value of arm intervals is equal to or less than 12 μm, an average grain diameter of carbides contained in the microstructure is 5 nm to 100 nm, and a number density of carbides is equal to or more than 2×106/mm2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.