Faculty Profiles - YAMAGUCHI Tomiko

Papers - YAMAGUCHI Tomiko

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X-ray Study on Plastic Strain Distribution in Soft Zone of A5052-H Weld Metal Reviewed

Mitsuaki Katoh,Kazumasa Nishio,Tomiko Yamaguchi

11th International Symposium on NDCM 2002.04

Influence of several factors on liquation cracking in 6082 aluminum alloy GTA spot welds Reviewed

KATOH Mitsuaki, NISHIO Kazumasa, YAMAGUCHI Tomiko, OKANO Hirofumi

52 ( 2 ) 76 - 81 2002.02

6082系アルミニウム合金のティグアークスポット溶接部の液化割れに及ぼす諸因子の影響 Reviewed

加藤光昭,西尾一政,山口富子,岡野洋文

軽金属学会 52 ( 2 ) 76 - 81 2002.02

Influence of several factors on liquation cracking in 6082 aluminum alloy GTA spot welds. Reviewed

KATOH Mitsuaki, NISHIO Kazumasa, YAMAGUCHI Tomiko, OKANO Hirofumi

Journal of Japan Institute of Light Metals ( The Japan Institute of Light Metals ) 52 ( 2 ) 76 - 81 2002.02

Language：English Publishing type：Research paper (scientific journal)

Influences of chemical compositions of base metal, temperature difference ΔT between liquidus and solidus, and arc time on the susceptibility of liquation cracking were studied using the Varestraint test on 6082 aluminum alloy which was GTA spot welded. A commercial 6082 alloy and seven kinds of experimental 6082 alloy whose magnesium, silicon and manganese contents were changed were used. The susceptibility of liquation cracking was evaluated from the maximum crack length observed in heat affected zone after the Varestraint test. Liquation cracking was observed along grain boudaries on which low melting point compounds (mainly Mg2Si) were melted. The maximum crack length increased with arc time and ΔT. The addition of Si and Mg which increased ΔT promoted the liquation cracking, whereas the Mn addition suppressed the cracking by grain refining.

DOI： 10.2464/jilm.52.76

Scopus

CiNii Article

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0036475703&origin=inward

Materials evalution of diffusion bonded steel bar and its compact characteristics Reviewed

Katoh M., Nishio K., Yamaguchi T.

Welding in the World 45 ( 7-8 ) 24 - 30 2001.12

Change of Dissolved Amount of Magnesium and its Influence on Impact Energy of A5083 Welded with High Energy Density Welding Reviewed

YAMAGUCHI Tomiko, KATOH Mitsuaki, NISHIO Kazumasa

Quarterly journal of the Japan Welding Society. ( Japan Welding Society ) 19 ( 4 ) 656 - 663 2001.11

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

In the weld metal of A5083 welded with high energy density such as electron beam and laser beam, the amount of solute (mainly magnesium) of the primary crystals tends to increase with the increase in the welding speed. The solute concentration of solid phase tends to increase generally with the increase in the solid fraction and increases rapidly near the last stage of solidification, that is, the dendrite boundary. Though the dissolved amount of magnesium in the weld metal estimated with X-ray diffraction technique becomes lower than that of the base metal, this tends to approach to that of the base metal after the weld metal was homogenized. In this paper, we examined these phenomena more precisely. First, we calculated the distributions of magnesium by applying the rapid solidificatio theory when the dendrite arm spacings (DAS) were changed to several steps. Then, the dissolved amount of magnesium in the dendrite was calculated by considering the distributions of magnesium and we made clear the influence of DAS on the dissolved amount of magnesium. Next, we also calculated the distributions of magnesium when the weld metal was homogenized and made clear the influence of DAS on the dissolved amount of magnesium after the homogenization. Moreover, the actual weld metals, in which DAS were changed, were obtained by changing the welding conditions with electron beam and we could experimentally confirm the same tendency as mentioned above which were simulated by the calculation. It was made clear that the Charpy impact energy of the weld metals linearly increased with the increase in the dissolved amount of magnesium.

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/110003422131

高エネルギー密度溶接をしたA5083における固溶Mg量の変化と衝撃値に及ぼす影響 Reviewed

山口富子,加藤光昭,西尾一政

溶接学会論文集 19 ( 4 ) 656 - 663 2001.11

Change of Dissolved Amount of Magnesium and its Influence on Impact Energy of A5083 Welded with High Energy Density Welding. Reviewed

YAMAGUCHI Tomiko, KATOH Mitsuaki, NISHIO Kazumasa

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY ( JAPAN WELDING SOCIETY ) 19 ( 4 ) 656 - 663 2001.11

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

In the weld metal of A5083 welded with high energy density such as electron beam and laser beam, the amount of solute (mainly magnesium) of the primary crystals tends to increase with the increase in the welding speed. The solute concentration of solid phase tends to increase generally with the increase in the solid fraction and increases rapidly near the last stage of solidification, that is, the dendrite boundary. Though the dissolved amount of magnesium in the weld metal estimated with Xray diffraction technique becomes lower than that of the base metal, this tends to approach to that of the base metal after the weld metal was homogenized. In this paper, we examined these phenomena more precisely. First, we calculated the distributions of magnesium by applying the rapid solidification theory when the dendrite arm spacings (DAS) were changed to several steps. Then, the dissolved amount of magnesium in the dendrite was calculated by considering the distributions of magnesium and we made clear the influence of DAS on the dissolved amount of magnesium. Next, we also calculated the distributions of magnesium when the weld metal was homogenized and made clear the influence of DAS on the dissolved amount of magnesium after the homogenization. Moreover, the actual weld metals, in which DAS were changed, were obtained by changing the welding conditions with electron beam and we could experimentally confirm the same tendency as mentioned above which were simulated by the calculation. It was made clear that the Charpy impact energy of the weld metals linearly increased with the increase in the dissolved amount of magnesium.

DOI： 10.2207/qjjws.19.656

Scopus

CiNii Article

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0035520773&origin=inward

Study on Plastic Strain Distribution in Soft Zone of A5052-H Weld Metal using X-ray Diffraction

2001 ( 2 ) 273 - 274 2001.10

Estimation of Magnetizing Situation in Yoke Method

2001 ( 2 ) 11 - 12 2001.10

Study on Magnetic Testing using Magnetic Sheets

2001 ( 2 ) 15 - 16 2001.10

Influence of B-H Curves on Leakage Flux Density from a Defect in Yoke Method

2001 ( 2 ) 13 - 14 2001.10

Microbially Influenced Corrosion of Stainless Steel Welds and its Nondestructive Detection

2001 ( 2 ) 219 - 220 2001.10

Transmission Electron Microscopy of Aluminum Clad Titanium Bonded Zone Produced by Vacuum Roll Bonding

SAKAMOTO K., NISHIO K., KATOH M., YAMAGUCHI T., ERA H.

69 360 - 361 2001.09

TEMPER EMBRITTLEMENT OF DUPLEX STAINLESS STEEL AND ITS NON-DESTRUCTIVE EVALUATION Reviewed

M. Katoh,K. Nishio,T. Yamaguchi,Y.matsumoto,H.Ikeda

Nondestructive Characterization of Materials X, Elsevier Science 387 - 394 2001.03

YAGレーザ溶接したアルミニウム合金A5052溶接部の硬さ分布 Reviewed

山口富子,加藤光昭,西尾一政,深海健一

溶接学会論文集 19 ( 1 ) 114 - 121 2001.02

Growth features of crystals in laser-welded aluminium and aluminium alloys Reviewed

Yamaguchi T., Kato M., Nishio K., Sawai N.

Welding International 15 ( 7 ) 518 - 525 2001.01

Hardness distribution of YAG laser-welded A5052 aluminium alloy Reviewed

Yamaguchi T., Kato M., Nishio K., Fukami K.

Welding International 15 ( 11 ) 863 - 870 2001.01

FEM study on the influence of air gap and specimen thickness on the detectability of flaw in yoke method Reviewed

Katoh M., Nishio K., Yamaguchi T.

Welding in the World 44 ( 1 ) 25 - 29 2000.12

Growth feature of crystals in aluminum and aluminum alloy welded with laser Reviewed

Yamaguchi T., Katoh M., Nishio K., Sawai N.

Welding Research Abroad 46 ( 12 ) 2000.12

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Papers - YAMAGUCHI Tomiko