Spot welding method of high-strength steel sheets excellent in joint strength
US-2015174690-A1 · Jun 25, 2015 · US
Joint structure and method for manufacturing joint structure
US2022016725A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2022016725-A1 |
| Application number | US-201917292822-A |
| Country | US |
| Kind code | A1 |
| Filing date | Sep 19, 2019 |
| Priority date | Nov 19, 2018 |
| Publication date | Jan 20, 2022 |
| Grant date | — |
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- Title
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Abstract
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A joint structure, includes: a first member including a high tensile strength steel; and a second member including a high tensile strength steel and superposed on the first member, the first member and the second member being resistance welded to each other, in which a gap between the first member and the second member is between 0 mm and 3 mm, a nugget is not formed at a joint portion between the first member and the second member, or when the nugget is formed at the joint portion between the first member and the second member, a diameter D1 of the nugget satisfies D1<5 mm, and a decarburized layer is provided 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.
First claim
Opening claim text (preview).
1 . A joint structure, comprising: a first member comprising a high tensile strength steel; and a second member comprising a high tensile strength steel and superposed on the first member, the first member and the second member being resistance welded to each other, wherein a gap between the first member and the second member is more than 0 mm and less than 3 mm, a nugget is not formed at a joint portion between the first member and the second member, or when the nugget is formed at the joint portion between the first member and the second member, a diameter D 1 of the nugget satisfies D 1 <5 mm, and a decarburized layer is provided 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. 2 . The joint structure according to claim 1 , wherein a carbon amount of the high tensile strength steel of at least one of the first member and the second member is 0.35 mass % or more. 3 . The joint structure according to claim 1 , wherein a corona bond is formed around the nugget, and a diameter D 2 of the corona bond satisfies D 1 <D 2 and D 2 <7 mm. 4 . A method for manufacturing the joint structure according to claim 1 , comprising: superposing the second member on the first member so that the decarburized 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 resistance welding the first member and the second member by sandwiching and pressurizing the first member and the second member by a pair of electrodes and energizing between the pair of electrodes. 5 . The joint structure according to claim 2 , wherein a corona bond is formed around the nugget, and a diameter D 2 of the corona bond satisfies D 1 <D 2 and D 2 <7 mm. 6 . A method for manufacturing the joint structure according to claim 2 , comprising: superposing the second member on the first member so that the decarburized 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 resistance welding the first member and the second member by sandwiching and pressurizing the first member and the second member by a pair of electrodes and energizing between the pair of electrodes. 7 . A method for manufacturing the joint structure according to claim 3 , comprising: superposing the second member on the first member so that the decarburized 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 resistance welding the first member and the second member by sandwiching and pressurizing the first member and the second member by a pair of electrodes and energizing between the pair of electrodes. 8 . A method for manufacturing the joint structure according to claim 5 , comprising: superposing the second member on the first member so that the decarburized 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 resistance welding the first member and the second member by sandwiching and pressurizing the first member and the second member by a pair of electrodes and energizing between the pair of electrodes.
Assignees
Inventors
Classifications
- B23K11/115Primary
by means of two electrodes placed opposite one another on both sides of the welded parts · CPC title
Welding of coated materials · CPC title
Preliminary treatment · CPC title
of galvanized or tinned materials · CPC title
Steel {or steel} alloys · CPC title
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- What does patent US2022016725A1 cover?
- A joint structure, includes: a first member including a high tensile strength steel; and a second member including a high tensile strength steel and superposed on the first member, the first member and the second member being resistance welded to each other, in which a gap between the first member and the second member is between 0 mm and 3 mm, a nugget is not formed at a joint portion between …
- 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 Thu Jan 20 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).