Steel sheet, hot-dip galvanized steel sheet and galvannealed steel sheet
US-2020325554-A1 · Oct 15, 2020 · US
Joined structure and method for manufacturing joined structure
US12097569B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12097569-B2 |
| Application number | US-201917292141-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 19, 2019 |
| Priority date | Nov 19, 2018 |
| Publication date | Sep 24, 2024 |
| Grant date | Sep 24, 2024 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A joint structure, includes: a first member including a high tensile strength steel; a second member including a high tensile strength steel and superposed on the first member; a surface soft layer formed on at least one of a superposition surface of the first member, on which the second member is superposed, and a superposition surface of the second member, on which the first member is superposed; a molten-solidified portion formed by melting and solidifying the first member and the second member; and a heat affected zone formed around the molten-solidified portion, in which the surface soft layer has a total thickness of 5 μm to 200 μm, and the molten-solidified portion has a carbon amount of 0.21 mass % or more, and a maximum Vickers hardness of the surface soft layer in the heat affected zone is 100 Hv to 500 Hv.
First claim
Opening claim text (preview).
The invention claimed is: 1. A joint structure, comprising: a first member comprising a high tensile strength steel; a second member comprising a high tensile strength steel and superposed on the first member; a surface soft layer formed on at least one of a superposition surface of the first member, on which the second member is superposed, and a superposition surface of the second member, on which the first member is superposed; a molten-solidified portion formed by melting and solidifying the first member and the second member; and a heat affected zone formed around the molten-solidified portion, wherein the surface soft layer has a total thickness of 5 μm or more and 200 μm or less, and the molten-solidified portion has a carbon amount of 0.21 mass % or more, and a maximum Vickers hardness of the surface soft layer in the heat affected zone is 100 Hv or more and 500 Hv or less. 2. The joint structure according to claim 1 , wherein the surface soft layer is a decarburized layer. 3. The joint structure according to claim 2 , wherein a diameter D of the molten-solidified portion and a sheet thickness t min of a thinner one of a sheet thickness of the first member and a sheet thickness of the second member satisfy the following formula (1): D≥ 3.5√ t min (1). 4. The joint structure according to claim 3 , wherein a total thickness of the surface soft layer is 30 μm or more. 5. A method for manufacturing the joint structure according to claim 4 , the method comprising: superposing the second member on the first member so that the surface soft layer formed on a surface of at least one of the first member and the second member is interposed between the first member and the second member, and then forming the molten-solidified portion by welding. 6. A method for manufacturing the joint structure according to claim 3 , the method comprising: superposing the second member on the first member so that the surface soft layer formed on a surface of at least one of the first member and the second member is interposed between the first member and the second member, and then forming the molten-solidified portion by welding. 7. The joint structure according to claim 2 , wherein a total thickness of the surface soft layer is 30 μm or more. 8. A method for manufacturing the joint structure according to claim 2 , the method comprising: superposing the second member on the first member so that the surface soft layer formed on a surface of at least one of the first member and the second member is interposed between the first member and the second member, and then forming the molten-solidified portion by welding. 9. A method for manufacturing the joint structure according to claim 7 , the method comprising: superposing the second member on the first member so that the surface soft layer formed on a surface of at least one of the first member and the second member is interposed between the first member and the second member, and then forming the molten-solidified portion by welding. 10. The joint structure according to claim 1 , wherein a diameter D of the molten-solidified portion and a sheet thickness t min of a thinner one of a sheet thickness of the first member and a sheet thickness of the second member satisfy the following formula (1): D≥ 3.5√ t min (1). 11. The joint structure according to claim 10 , wherein a total thickness of the surface soft layer is 30 μm or more. 12. A method for manufacturing the joint structure according to claim 11 , the method comprising: superposing the second member on the first member so that the surface soft layer formed on a surface of at least one of the first member and the second member is interposed between the first member and the second member, and then forming the molten-solidified portion by welding. 13. A method for manufacturing the joint structure according to claim 10 , the method comprising: superposing the second member on the first member so that the surface soft layer formed on a surface of at least one of the first member and the second member is interposed between the first member and the second member, and then forming the molten-solidified portion by welding. 14. The joint structure according to claim 1 , wherein a total thickness of the surface soft layer is 30 μm or more. 15. A method for manufacturing the joint structure according to claim 14 , the method comprising: superposing the second member on the first member so that the surface soft layer formed on a surface of at least one of the first member and the second member is interposed between the first member and the second member, and then forming the molten-solidified portion by welding. 16. A method for manufacturing the joint structure according to claim 1 , the method comprising: superposing the second member on the first member so that the surface soft layer formed on a surface of at least one of the first member and the second member is interposed between the first member and the second member, and then forming the molten-solidified portion by welding.
Assignees
Inventors
Classifications
containing aluminium · CPC title
containing manganese · CPC title
containing silicon · CPC title
containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title
Decarburising · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US12097569B2 cover?
- A joint structure, includes: a first member including a high tensile strength steel; a second member including a high tensile strength steel and superposed on the first member; a surface soft layer formed on at least one of a superposition surface of the first member, on which the second member is superposed, and a superposition surface of the second member, on which the first member is superpo…
- Who is the assignee on this patent?
- Kobe Steel Ltd
- What technology area does this patent fall under?
- Primary CPC classification B23K11/115. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Sep 24 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).