Spot welded joint
US10081073B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2013 |
| Grant date | Sep 25, 2018 |
| Priority date | — |
| Expiry date | Nov 3, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/01015
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In a spot welded joint according to an aspect of the present invention, with respect to a rectangular planar region of 100 μm×100 μm which is perpendicular to a sheet surface of the plurality of the steel sheets and which centers around an inner point spaced away by 100 μm in a direction parallel with the sheet surface from an edge of a nugget, in a case of measuring a P concentration at a pitch of 1 μm to obtain measured values of the P concentration at 100×100 of measurement points, and in a case of repetitively calculating an average value of the measured values of the P concentration at 20 of the measurement points which are adjacent to each other and which are arranged in a row in the direction parallel with the sheet surface among the 100×100 of the measurement points while shifting each one point to obtain 81×100 of the average values, the number of the average values which are more than two times an average P concentration is 0 to 100.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.