US12337408B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12337408-B2 |
| Application number | US-202218704917-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 1, 2022 |
| Priority date | Nov 30, 2021 |
| Publication date | Jun 24, 2025 |
| Grant date | Jun 24, 2025 |
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
What the patent document calls the invention.
A short plain-language summary of the technical disclosure.
Who owns or filed the patent and who is credited as inventor.
Filing, priority, publication, and grant dates set the timeline.
The legal scope of protection — read this for what is actually claimed.
Technology tags used to group this patent with similar filings.
Prior art links and similar publications in this corpus.
Official abstract text for this publication.
Provided is an electrical steel strip friction stir welding method that is able to inhibit the occurrence of coil joint fractures on a production line caused by deterioration of mechanical properties and shape of the coil joint while maintaining high work efficiency and that is also advantageous in terms of rotating tool durability. In the method, preheated double-sided friction stir welding is performed, diameter D (mm) of shoulders of rotating tools satisfies the relationship of the following Expression (7), and rotation speed RS (r/min) of the rotating tools, the diameter D (mm) of shoulders of the rotating tools, and joining speed JS (mm/min), expressed as RS×D 3 /JS, satisfy the relationship of the following Expression (8), 4×TJ≤D≤10×TJ . . . (7), and 180×TJ≤RS×D 3 /JS≤1500×TJ . . . (8).
Opening claim text (preview).
The invention claimed is: 1. An electrical steel strip friction stir welding method for joining a first electrical steel strip and a second electrical steel strip as a material to be joined by a pair of rotating tools facing each other, comprising: a preheating process of preheating an unjoined portion of the material to be joined by a heating device disposed in front of the rotating tools in a joining direction on at least one side of the material to be joined; and a joining process of pressing the rotating tools into the unjoined portion of the material to be joined from both sides while rotating the rotating tools in opposite directions, and joining the first electrical steel strip and the second electrical steel strip by moving the rotating tools in the joining direction, wherein the unjoined portion of the material to be joined is a butted portion or an overlapped portion between an end of the first electrical steel strip and an end of the second electrical steel strip following the first electrical steel strip, the preheating process and the joining process are performed continuously by moving the heating device in the joining direction in conjunction with the rotating tools, the diameter D (mm) of shoulders of the rotating tools satisfies the relationship of the following Expression (7), and a rotation speed RS (r/min) of the rotating tools, the diameter D (mm) of the shoulders of the rotating tools, and a joining speed JS (mm/min), expressed as RS×D 3 /JS, satisfy the relationship of the following Expression (8), 4 × TJ ≤ D ≤ 10 × TJ ( 7 ) 180 × TJ ≤ RS × D 3 / JS ≤ 1500 × TJ ( 8 ) where TJ is defined such that, when the unjoined portion is the butted portion, TJ is an average value (mm) of the thickness of the first electrical steel strip and the thickness of the second electrical steel strip, and when the unjoined portion is the overlapped portion, TJ is the thickness (mm) of the overlapped portion. 2. The electrical steel strip friction stir welding method according to claim 1 , wherein in the joining process, joining is performed under conditions that steel microstructures of a joined portion and a thermo-mechanically affected zone formed by joining of the first electrical steel strip and the second electrical steel strip become mainly ferrite phase, respectively, and the relationships of the following Expressions (1) to (4) are satisfied, Dsz ≤ 200 μm ( 1 ) Dhaz 1 ≤ Dbm 1 ( 2 ) Dhaz 2 ≤ Dbm 2 ( 3 ) 0.9 × ( Hbm 1 + Hbm 2 ) / 2 ≤ Hsz ≤ 1.2 × ( Hbm 1 + Hbm 2 ) / 2 ( 4 ) wherein Dsz is an average value (μm) of ferrite grain size of the joined portion, Dhaz1 is an average value (μm) of ferrite grain size of a thermo-mechanically affected zone on a first electrical steel strip side, Dhaz2 is an average value (μm) of ferrite grain size of a thermo-mechanically affected zone on a second electrical steel strip side, Dbm1 is an average value (μm) of ferrite grain size of a base metal portion of the first electrical steel strip, Dbm2 is an average value (μm) of ferrite grain size o
involving metallurgical change · CPC title
Bands or sheets of indefinite length · CPC title
Steel {or steel} alloys · CPC title
by melting · CPC title
by induction heating · CPC title
Related publications grouped by family.
Answers are generated from the same data shown on this page.