Faculty Profiles - KITAMURA Takanori

Papers - KITAMURA Takanori

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Tc and resistivity variation induced by external bending strain in flexible film of strain-sensitive (La,Sr)2⁢Cu⁢O4 Reviewed International journal

Tomoya Horide, Tomoaki Maekawa, Tatsuro Aikawa, Takanori Kitamura, Kazuma Nakamura

PHYSICAL REVIEW MATERIALS ( American Physical Society ) 8 ( 9 ) 094802-1 - 094802-13 2024.09

Effect of Combined Use of Brazing or Soldering around the Nugget on Tensile Shear Strength of Resistance Spot Welded Lap Joint Reviewed International journal

Takanori Kitamura, Tetsuya Akiyama, Atsuro Uemura, Chinatsu Mihara

MATERIALS TRANSACTIONS ( The Japan Institute of Metals and Materials ) 64 ( 10 ) 2489 - 2495 2023.08

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

Resistance spot welding is used in the assembly of automobile bodies. The use of high tensile strength steel plates in automobile bodies is expanding, and there is a need to develop a welding process that improves the joint strength per resistance spot weld point. To improve the joint strength per resistance spot weld, resistance spot welding can be combined with other joining methods, such as the WeldBond method. As an additional joining method around the nugget, other than using adhesives as in the WeldBond method, brazing can be used to obtain a strong joint without melting the base metal. In this paper, it was proposed that the joint strength can be enhanced by using resistance spot welding and brazing or soldering based on the rule of mixture. And, based on this concept, effect of additional joint around a nugget, such as brazing or soldering, on rotational deformation of joint part and tensile shear strength of resistance spot welded lap joint was examined.First, three types of lap joint specimens that were using only resistance spot welding, using only brazing and using both joining methods (called WeldBraze) were prepared. A high-strength steel sheet HT590 with a thickness of 1.0 mm was used. For the brazing filler metal, lead-free solder (composition: Sn–0.3Ag–0.7Cu) was used. Next, tensile shear tests were conducted using all the test specimens. In general, rotational deformation of the joint occurs due to the offset of the load axis for the tensile shear test of the lap joint. It is necessary to investigate the effect of the rotational deformation on joint strength. Therefore, a tensile shear test was performed using a test specimen in which the welded joint part was sandwiched between two steel blocks to suppress rotational deformation.As a result, it was confirmed that the new joining method using both brazing and resistance spot welding increased the joint strength and the amount of displacement up to fracture as compared with the case of brazing or resistance spot welding only.So, it was clarified that the factor of the strengthening of the joint was the rule of mixture, and the increase of displacement up to the fracture was affected by the suppression of rotational deformation.In conclusion, it was found that the joining method using both brazing and resistance spot welding was effective in improving the joint strength. This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. 85 (2021) 345–351.

DOI： 10.2320/matertrans.MT-M2023096

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/matertrans/advpub/0/advpub_MT-M2023096/_article/-char/ja

Effect of plate deformation around the nugget during tensile test on tensile shear strength of resistance spot welded lap joints Reviewed International journal

Takanori Kitamura, Tetsuya Akiyama, Mitsuhiro Imamura, Tomoya Kawabata, Atsuro Uemura, Chinatsu Mihara & Koki Iwatani

WELDING INTERNATIONAL ( Taylor & Francis Group ) 37 ( 9 ) 531 - 538 2023.06

抵抗スポット溶接L字継手の引張強度に及ぼすアーム長さの影響 Reviewed

北村貴典, 秋山哲也, 平山響, 濵﨑真太郎, 近野謙, 河野大輔

溶接学会論文集 ( 一般社団法人溶接学会 ) 41 ( 1 ) 26 - 35 2023.02

抵抗スポット溶接重ね継手の引張せん断強度に及ぼす引張試験時のナゲット周囲の板の変形の影響 Reviewed

北村貴典, 秋山哲也, 今村光宏, 川端智也, 植村篤郎, 三原知夏, 岩谷航希

溶接学会論文集 ( 一般社団法人溶接学会 ) 41 ( 1 ) 11 - 17 2023.02

Effect of Combined Use of Brazing or Soldering around the Nugget on Tensile Shear Strength of Resistance Spot Welded Lap Joint Reviewed

Kitamura Takanori, Akiyama Tetsuya, Uemura Atsuro, Mihara Chinatsu

Journal of the Japan Institute of Metals and Materials ( The Japan Institute of Metals and Materials ) 85 ( 9 ) 345 - 351 2021.09

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

Resistance spot welding is used in the assembly of automobile bodies. The use of high tensile strength steel plates in automobile bodies is expanding, and there is a need to develop a welding process that improves the joint strength per resistance spot weld point. To improve the joint strength per resistance spot weld, resistance spot welding can be combined with other joining methods, such as the WeldBond method. As an additional joining method around the nugget, other than using adhesives as in the WeldBond method, brazing can be used to obtain a strong joint without melting the base metal. In this paper, it was proposed that the joint strength can be enhanced by using resistance spot welding and brazing or soldering based on the rule of mixture. And, based on this concept, effect of additional joint around a nugget, such as brazing or soldering, on rotational deformation of joint part and tensile shear strength of resistance spot welded lap joint was examined.First, three types of lap joint specimens that were using only resistance spot welding, using only brazing and using both joining methods (called WeldBraze) were prepared. A high-strength steel sheet HT590 with a thickness of 1.0 mm was used. For the brazing filler metal, lead-free solder (composition: Sn-0.3Ag-0.7Cu) was used. Next, tensile shear tests were conducted using all the test specimens. In general, rotational deformation of the joint occurs due to the offset of the load axis for the tensile shear test of the lap joint. It is necessary to investigate the effect of the rotational deformation on joint strength. Therefore, a tensile shear test was performed using a test specimen in which the welded joint part was sandwiched between two steel blocks to suppress rotational deformation.As a result, it was confirmed that the new joining method using both brazing and resistance spot welding increased the joint strength and the amount of displacement up to fracture as compared with the case of brazing or resistance spot welding only.So, it was clarified that the factor of the strengthening of the joint was the rule of mixture, and the increase of displacement up to the fracture was affected by the suppression of rotational deformation.In conclusion, it was found that the joining method using both brazing and resistance spot welding was effective in improving the joint strength.

DOI： 10.2320/jinstmet.J2020065

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130008056611

Effect of Heating Order on Interference between Deformations by Curved Line Heating in Laser Forming Reviewed

Akiyama Tetsuya, Kitamura Takanori, Izutsu Ryosuke, Maeda Yuta

Journal of the Japan Institute of Metals and Materials ( The Japan Institute of Metals and Materials ) 85 ( 4 ) 138 - 146 2021.04

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

Laser forming is one of a few processing methods that can form a plate material into a curved surface without contact and without using a mold. A combination of multiple curved heating lines is required to form a practical shape. The relationship between heating conditions and deformation has been studied in detail in the field of welding, etc. when the heating line is straight. However, there are not many reports investigating the effect of interference between heating lines on deformation.Therefore, in this study, we investigated the interference effect of multiple heating lines with different heating order on angular distortion in laser forming under different two conditions, straight heating lines and curved heating lines.Annealed austenitic stainless steel sheet material with 0.75 mm thick was used as the test material for the laser forming with 1500 W YAG laser before deformation measurement by using a non-contact three-dimensional coordinate measuring device.From the relationship between the heating order and the angular distortions of the three heating lines arranged concentrically, the influence of the area inside and outside of the curved heating line on the angular distortion behavior of the other heating lines was investigated. When the heating was repeated inside the curved heating line, the inner heating hardly interfered with the angular deformation of the outer heating line, but the angular distortion on the heating line placed inside was changed.When the heating lines were placed on the outside in order, the amount of angular distortion of the heating lines placed earlier changed depending on the heating lines placed later. When considering the curved heating part by classifying it into the inside and outside of the curve, the ability to interfere with the angular distortion of other heating lines was observed inside, but not outside.When laser forming curved surface using multiple curved heating, it was found that the classification of the inner and outer regions of the curved heating part and the heating order are important for examining the interference between the heating lines.

DOI： 10.2320/jinstmet.J2020033

Scopus

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130008002718

レーザフォーミングにおける平行線状加熱順序が曲面成形に与える影響 Reviewed

秋山哲也, 北村貴典, 東謙吾, 倉本洋彰, 岸大祐

日本金属学会誌 82 ( 9 ) 2018.09

Dependence of Load Angle on Static Strength of Resistance Spot Welded Lap Joint under Combined Load Test Reviewed

Tetsuya Akiyama, Takanori Kitamura, Tetsushi Ono

Materials Transactions 59 ( 8 ) 1275 - 1279 2018.06

複合荷重試験での抵抗スポット溶接重ね継手強度の荷重角度依存性について Reviewed

秋山哲也, 北村貴典, 小野哲士

日本金属学会誌 82 ( 3 ) 59 - 63 2018.03

Structural Evolution Induced by Interfacial Lattice Mismatch in Self-Organized YBa2Cu3O7-δ Nanocomposite Film Reviewed

11 ( 2 ) 1780 - 1788 2017.02

Hybrid artificial pinning centers of elongated-nanorods and segmentednanorods in YBa2Cu3O7 films Reviewed

29 ( 10 ) - 105010 2016.09

Effect of Heating Order on Twisted Curved Surface Forming by Orthogonal Laser Line Heating on Top and Bottom Surfaces Alternately Reviewed

Tetsuya Akiyama, Takanori Kitamura, Hirohiko Kakiuchi, Ryohei Hada, Akira Gotoh

Journal of the Japan Institute of Metals and Materials 79 ( 12 ) 639 - 643 2015.12

Enhancement of Cross-Tension Strength of Resistance Spot-Welded Lap Joints by Laser Heating Reviewed

Takanori Kitamura, Tetsuya Akiyama, Masaru Asada

Journal of the Japan Institute of Metals and Materials 79 ( 10 ) 518 - 522 2015.10

Effect of Heat Input and Initial Curvature Radius on Deformation of Thin Plate Heated on Concave or Convex Surface by Laser Beam Reviewed

Tetsuya Akiyama, Takanori Kitamura, Minoru Kido

Journal of the Japan Institute of Metals and Materials 79 ( 10 ) 523 - 527 2015.10

Strengthening of Cross Tension Strength of Spot Welded Lap Joints by Increasing the Opening Angle on the Nugget Edge Reviewed

Takanori KITAMURA, Tetsuya AKIYAMA, Tomohito TATEISHI

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 32 ( 3 ) 130 - 136 2014.08

Elastic Strain Evolution in Nanocomposite Structure of YBa2Cu3O7+BaZrO3 Superconducting Films"jointly worked" Reviewed

Tomoya Horide, Takanori Kitamura, Ataru Ichinose, Kaname Matsumoto

Japanese Journal of Applied Physics 53 ( 8 ) 83101 2014.07

Strengthening of Spot Welded Lap Joints by New Hardened Zone Reviewed

Takanori KITAMURA, Tetsuya AKIYAMA, Yu MASUDA

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 31 ( 2 ) 89 - 95 2013.05

レーザフォーミングされた薄板椀形実曲面の面内ひずみの推定 Reviewed

秋山哲也,寺崎俊夫,北村貴典

溶接学会論文集 27 ( 2 ) 139 - 144 2009.06

ガス切断により板に与えられる熱量について Reviewed

寺崎俊夫,北村貴典,宮本昌寛,藤井俊英

日本船舶海洋工学論文集 10 197 - 204 2009.03

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Papers - KITAMURA Takanori