Patents by Inventor Kazuaki Hosomi

Kazuaki Hosomi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10975899
    Abstract: A welded member includes a hot dip Zn-based alloy coated steel sheet as a base material and has excellent corrosion resistance and weld bead shear strength. In the welded member in which a lower sheet and an upper sheet, which are hot dip Zn-based alloy coated steel sheets, are stacked and arc-welded together, a weld bead is formed so that a cross-sectional width W satisfies the following formula 2T?W?6T, and a blowhole occupancy Br represented by the following formula becomes not more than 50%: Br=(?di/L)×100, where T represents a thickness of the hot dip Zn-based alloy coated steel sheet, di represents a length of an i-th blowhole observed in X-ray radiography, and L represents a length of the weld bead.
    Type: Grant
    Filed: September 15, 2017
    Date of Patent: April 13, 2021
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Kazuaki Hosomi, Tomokazu Nobutoki, Takefumi Nakako
  • Patent number: 10906113
    Abstract: Hot dip Zn-based alloy coated steel sheets (1, 1?) are arc-weld in such a way that (a) a current waveform is a pulsed current waveform in which (i) a peak current and a base current alternate with each other at a pulse period of 1 ms to 50 ms and (ii) an average welding current is 100 A to 350 A and (b) an average welding voltage is 20 V to 35 V. Each of the hot dip Zn-based alloy coated steel sheets (1, 1?) includes a coating layer that contains Zn as a main component and that contains Al at a concentration of 1.0% by mass to 22.0% by mass, and has a coating weight W of 15 g/m2 to 250 g/m2.
    Type: Grant
    Filed: February 2, 2016
    Date of Patent: February 2, 2021
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Kazuaki Hosomi, Tomokazu Nobutoki, Takefumi Nakako
  • Patent number: 10807177
    Abstract: The present invention provides a method for MIG brazing an Al alloy to a steel sheet so as to manufacture a lap joint member that excels in bonding strength with respect to the Al alloy. With the MIG brazing method, a bonding target sheet, specifically, an Al sheet or an Al alloy sheet is bonded to a hot dip Zn-based alloy coated steel sheet (1) whose coating layer contains Al in an amount of 1.0% by mass to 22.0% by mass. A target location of MIG brazing is a region between (i) an intersection (C) of one end of an end surface (6) of the bonding target sheet and the hot dip Zn-based alloy coated steel sheet and (ii) the other end (U) of the end surface of the bonding target sheet.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: October 20, 2020
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Kazuaki Hosomi, Kouki Tomimura, Takefumi Nakako
  • Patent number: 10792746
    Abstract: The present invention provides a method for laser brazing an Al alloy to a steel sheet so as to produce a lap joint member that excels in bonding strength with respect to the Al alloy. The laser brazing method includes a brazing step of forming a brazed part (9) for bonding an Al alloy (3) to a hot dip Zn-based alloy coated steel sheet (1) in which a coating layer (2) contains 1.0 to 22.0% by mass of Al and a coating weight per surface is 15 to 250 g/m2.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: October 6, 2020
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Kazuaki Hosomi, Kouki Tomimura, Takefumi Nakako
  • Publication number: 20200056643
    Abstract: A welded member includes a hot dip Zn-based alloy coated steel sheet as a base material and has excellent corrosion resistance and weld bead shear strength. In the welded member in which a lower sheet and an upper sheet, which are hot dip Zn-based alloy coated steel sheets, are stacked and arc-welded together, a weld bead is formed so that a cross-sectional width W satisfies the following formula 2T?W?6T, and a blowhole occupancy Br represented by the following formula (2) becomes not more than 50%: Br=(?di/L)×100, where T represents a thickness of the hot dip Zn-based alloy coated steel sheet, di represents a length of an i-th blowhole observed in X-ray radiography, and L represents a length of the weld bead.
    Type: Application
    Filed: September 15, 2017
    Publication date: February 20, 2020
    Inventors: Kazuaki Hosomi, Tomokazu Nobutoki, Takefumi Nakako
  • Publication number: 20200055133
    Abstract: The present invention provides a method for MIG brazing an Al alloy to a steel sheet so as to manufacture a lap joint member that excels in bonding strength with respect to the Al alloy. With the MIG brazing method, a bonding target sheet, specifically, an Al sheet or an Al alloy sheet is bonded to a hot dip Zn-based alloy coated steel sheet (1) whose coating layer contains Al in an amount of 1.0% by mass to 22.0% by mass. A target location of MIG brazing is a region between (i) an intersection (C) of one end of an end surface (6) of the bonding target sheet and the hot dip Zn-based alloy coated steel sheet and (ii) the other end (U) of the end surface of the bonding target sheet.
    Type: Application
    Filed: February 21, 2018
    Publication date: February 20, 2020
    Inventors: Kazuaki Hosomi, Kouki Tomimura, Takefumi Nakako
  • Publication number: 20200023453
    Abstract: The present invention provides a method for laser brazing an Al alloy to a steel sheet so as to produce a lap joint member that excels in bonding strength with respect to the Al alloy. The laser brazing method includes a brazing step of forming a brazed part (9) for bonding an Al alloy (3) to a hot dip Zn-based alloy coated steel sheet (1) in which a coating layer (2) contains 1.0 to 22.0% by mass of Al and a coating weight per surface is 15 to 250 g/m2.
    Type: Application
    Filed: February 21, 2018
    Publication date: January 23, 2020
    Inventors: Kazuaki Hosomi, Kouki Tomimura, Takefumi Nakako
  • Patent number: 10518351
    Abstract: Provided are: an arc welding method that suppresses occurrences of blow holes in initial parts and final parts in a Zn plated steel sheet and reduces the occupancy ratio for blow holes in the welded part as a whole; and a welded joint.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: December 31, 2019
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Tomokazu Nobutoki, Kazuaki Hosomi
  • Publication number: 20180354049
    Abstract: Hot dip Zn-based alloy coated steel sheets (1, 1?) are arc-weld in such a way that (a) a current waveform is a pulsed current waveform in which (i) a peak current and a base current alternate with each other at a pulse period of 1 ms to 50 ms and (ii) an average welding current is 100 A to 350 A and (b) an average welding voltage is 20 V to 35 V. Each of the hot dip Zn-based alloy coated steel sheets (1, 1?) includes a coating layer that contains Zn as a main component and that contains Al at a concentration of 1.0% by mass to 22.0% by mass, and has a coating weight W of 15 g/m2 to 250 g/m2.
    Type: Application
    Filed: February 2, 2016
    Publication date: December 13, 2018
    Applicant: Nisshin Steel Co., Ltd.
    Inventors: Kazuaki Hosomi, Tomokazu Nobutoki, Takefumi Nakako
  • Patent number: 9993896
    Abstract: A laser welding method for welding materials having different thicknesses includes abutting two plates having different thicknesses such that one surface of the thin plate and one surface the thick plate are made flush with each other; and thereafter welding the plates by applying a laser beam to abutting surfaces thereof, wherein the laser beam is directed obliquely relative to an abutting end face of the thick plate, a target position of the laser beam is determined on the abutting end face of the thick plate, and a target position depth D on the abutting end face of the thick plate is determined based on the formula t/3?D?t where t is a thickness of the abutting end face of the thin plate.
    Type: Grant
    Filed: June 1, 2015
    Date of Patent: June 12, 2018
    Assignee: NISSHIN STEEL CO., LTD.
    Inventors: Kazuaki Hosomi, Kenji Ogawa, Takefumi Nakako, Keiji Yamamoto
  • Publication number: 20180071852
    Abstract: Provided is a welded joint that suppresses occurrences of blow holes in initial parts and final parts in a Zn plated steel sheet and reduces the occupancy ratio for blow holes in the welded part as a whole. The arc welded joint is obtained by the method of arc-welding Zn-based plated steel sheets, in which a blowhole occupancy over the entirety of the welding length is less than 30%.
    Type: Application
    Filed: September 18, 2017
    Publication date: March 15, 2018
    Inventors: Tomokazu NOBUTOKI, Kazuaki HOSOMI
  • Publication number: 20170326672
    Abstract: Provided are: an arc welding method that suppresses occurrences of blow holes in initial parts and final parts in a Zn plated steel sheet and reduces the occupancy ratio for blow holes in the welded part as a whole; and a welded joint.
    Type: Application
    Filed: July 31, 2015
    Publication date: November 16, 2017
    Inventors: Tomokazu NOBUTOKI, Kazuaki HOSOMI
  • Publication number: 20170297145
    Abstract: Provided is a laser welding method of materials having different thicknesses that can achieve excellent weld strength regardless of the thickness of a thick plate, and a welded member having different thicknesses.
    Type: Application
    Filed: June 1, 2015
    Publication date: October 19, 2017
    Inventors: Kazuaki HOSOMI, Kenji OGAWA, Takefumi NAKAKO, Keiji YAMAMOTO
  • Patent number: 9592772
    Abstract: [Problem] To provide a steel sheet hot-dip-plated with a Zn—Al—Mg-based alloy coating, which is remarkably improved in point of all the burring workability, the liquid metal embrittlement cracking resistance and the corrosion resistance in the welded part thereof, as a steel material favorable for arc-welded structural members.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: March 14, 2017
    Assignee: NISSHIN STEEL CO., LTD.
    Inventors: Kentaro Hirata, Yukio Katagiri, Susumu Fujiwara, Kazuaki Hosomi, Masaaki Uranaka
  • Publication number: 20150231726
    Abstract: A method for producing an arc-welded Zn—Al—Mg alloy coated steel plate structural member excellent in liquid metal embrittlement cracking resistance is provided. The method contains a step of joining steel members by gas-shielded arc-welding to produce a welded structural member, at least one of the steel members to be used is a hot dip Zn—Al—Mg alloy coated steel plate member, and the shield gas contains an Ar gas, a He gas or an Ar—He mixed gas as a base gas with a CO2 concentration controlled in a range of from 0 to 7% by volume.
    Type: Application
    Filed: February 19, 2014
    Publication date: August 20, 2015
    Applicant: NISSHIN STEEL CO., LTD.
    Inventors: Kazuaki Hosomi, Tomokazu Nobutoki, Hiroshi Asada
  • Publication number: 20150136741
    Abstract: [Problem] To provide excellent liquid metal embrittlement cracking resistance to an arc-welded structural member using a Zn—Al—Mg based alloy coated steel plate member without restriction of the species of steel for a base steel for coating and without much increase in cost. [Solution to Problem] In a method for producing an arc-welded structural member containing a step of joining steel members by gas-shielded arc-welding to manufacture a welded structural member, at least one of the members to be joined is a hot dip Zn—Al—Mg based alloy coated steel plate member, and a shielding gas is a gas that is based on an Ar gas, a He gas or an Ar—He mixed gas and has a CO2 concentration CCO2 (% by volume) satisfying the following expression (2) in relation to a welding heat input Q (J/cm): 0?CCO2?2900Q?0.
    Type: Application
    Filed: May 22, 2013
    Publication date: May 21, 2015
    Applicant: NISSHIN STEEL CO., LTD.
    Inventors: Kazuaki Hosomi, Tomokazu Nobutoki, Hiroshi Asada
  • Publication number: 20130337287
    Abstract: [Problem] To provide a steel sheet hot-dip-plated with a Zn—Al—Mg-based alloy coating, which is remarkably improved in point of all the burring workability, the liquid metal embrittlement cracking resistance and the corrosion resistance in the welded part thereof, as a steel material favorable for arc-welded structural members.
    Type: Application
    Filed: February 28, 2012
    Publication date: December 19, 2013
    Applicant: Nisshin Steel CO. Ltd
    Inventors: Kentaro Hirata, Yukio Katagiri, Susumu Fujiwara, Kazuaki Hosomi, Masaaki Uranaka
  • Patent number: 5325416
    Abstract: The surface of a stainless steel sheet before Fe-coating and the surface of the same stainless steel sheet after Fe-coating are analyzed by X-ray fluorescent analysis to determine the ratio of a fluorescent X-ray intensity I.sub.Cr b ascribable to CF to a fluorescent X-ray intensity I.sub.Fe b ascribable to Fe before Fe-coating, I.sub.Cr b/I.sub.Fe b, and the ratio of a fluorescent X-ray intensity I.sub.Cr a ascribable to Cr to a fluorescent X-ray intensity I.sub.Fe a ascribable to Fe after Fe-coating, I.sub.Cr a/I.sub.Fe a, and the resulting values are substituted in the following equation to calculate an Fe coating weight W (g/m.sup.2).W=(I.sub.Cr b/I.sub.Fe b-I.sub.Cr a/I.sub.Fe a)/Cwherein C represents a proportional constant determined by the type of steel of a stainless steel sheet.
    Type: Grant
    Filed: October 25, 1993
    Date of Patent: June 28, 1994
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Minoru Saito, Kazuaki Hosomi, Toshiharu Kitsutaka