公开(公告)号：US20200378420A1

公开(公告)日：2020-12-03

申请号：US16636788

申请日：2018-08-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazuki MATSUDA ,  Shinji KODAMA ,  Kotaro WATANABE ,  Masatoshi TOKUNAGA

IPC: F16B5/08

Abstract: A lap fillet arc welded joint includes: a first steel sheet and a second steel sheet which are overlapped each other, the first steel sheet and the second steel sheet each having a tensile strength of 950 MPa or more; and a weld metal which extends along a corner formed by an upper surface of the first steel sheet and an end surface of the second steel sheet. When: a toe angle of the weld metal is defined as β; the total number of concave portions present on the surface of the weld metal included a range of 0.4 mm or less from a fusion boundary is defined as NA; and the number of concave portions in contact with ferrite grains having a maximum grain size of 10 μm or more is defined as NB, the weld metal satisfies the following conditional expressions (1) and (2) at the same time. 0°

公开(公告)号：US20190329347A1

公开(公告)日：2019-10-31

申请号：US16344766

申请日：2016-11-08

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroki FUJIMOTO ,  Kotaro WATANABE ,  Yasuhito TOTSUKA

IPC: B23K9/173 ,  B23K35/362 ,  B23K35/30 ,  B23K35/02 ,  C22C38/58 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  B23K9/16 ,  B23K9/24

Abstract: A flux-cored wire according to an aspect of the present invention includes: a steel sheath; and a flux filling the inside of the steel sheath, in which the flux contains 0.11% or more in total of a fluoride in terms of F-equivalent value, 4.30% to 7.50% of a Ti oxide in terms of TiO2 equivalent, 0.30% to 2.40% in total of an oxide in terms of mass %, and 0% to 0.60% in total of a carbonate in terms of mass %, the amount of a Ca oxide in terms of CaO is less than 0.20% in terms of mass %, the amount of CaF2 is less than 0.50%, a chemical composition of the flux-cored wire is within a predetermined range, a Z value is 2.00% or less, a V value is 5.0 to 27.0, and Ceq is 0.30% to 1.00% or less.

公开(公告)号：US20200246906A1

公开(公告)日：2020-08-06

申请号：US16758352

申请日：2018-01-22

Applicant: NIPPON STEEL CORPORATION

Inventor： Atsushi SUGIHASHI ,  Kotaro WATANABE ,  Yoshihiro HASHIMOTO

IPC: B23K11/087 ,  B23K31/02 ,  B23K11/00 ,  B23K31/12 ,  G01N33/207 ,  G06T7/00 ,  G06T7/90

Abstract: The welding operation monitoring system includes an image capturing device that is disposed on a side opposite to a side to which the plasma flow is supplied out of a pipe inside and a pipe outside of the strip-shaped steel sheet formed in a tubular shape, and is configured to capture a color image including a plasma flow over the V-shaped region; and a welding operation monitoring device that is configured to generate a specific color component image obtained by extracting a specific color component from the color image, and specifies a V-shaped display region, which is a region corresponding to the V-shaped region within the color image, on the basis of the V-shaped region shown in the specific color component image, thereby analyzing a state of the welding operation.

公开(公告)号：US20220395937A1

公开(公告)日：2022-12-15

申请号：US17775089

申请日：2020-11-09

Applicant: NIPPON STEEL CORPORATION

Inventor： Kotaro WATANABE

IPC: B23K35/368 ,  B23K35/02 ,  B23K9/173

Abstract: A flux-cored wire of the present disclosure has a steel sheath and a flux filled at an inside of the steel sheath, has a total amount of moisture by ratio with respect to a total wire mass of 300 ppm or less, has flux containing fluorides, and has an amount of the fluorides by ratio with respect to the total wire mass of, by total of values converted to F, 0.11 mass % or more and 2.50 mass % or less. If using the flux-cored wire of the present disclosure for welding, a stable weld shape can be obtained and, further, the amount of diffusible hydrogen of the weld metal can be reduced. For this reason, the flux-cored wire of the present disclosure can be suitably used for welding high strength steel such as ferrite steel.

公开(公告)号：US20220281024A1

公开(公告)日：2022-09-08

申请号：US17751039

申请日：2022-05-23

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroki FUJIMOTO ,  Kotaro WATANABE ,  Yasuhito TOTSUKA

IPC: B23K9/173 ,  B23K9/16 ,  B23K9/24 ,  B23K35/02 ,  B23K35/30 ,  B23K35/362 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

Abstract: A flux-cored wire according to an aspect of the present invention includes: a steel sheath; and a flux filling the inside of the steel sheath, in which the flux contains 0.11% or more in total of a fluoride in terms of F-equivalent value, 4.30% to 7.50% of a Ti oxide in terms of TiO2 equivalent, 0.30% to 2.40% in total of an oxide in terms of mass %, and 0% to 0.60% in total of a carbonate in terms of mass %, the amount of a Ca oxide in terms of CaO is less than 0.20% in terms of mass %, the amount of CaF2 is less than 0.50%, a chemical composition of the flux-cored wire is within a predetermined range, a Z value is 2.00% or less, a V value is 5.0 to 27.0, and Ceq is 0.30% to 1.00% or less.