Search Results 1-20 of 435

  • Study of blowhole generation in welded joint under like Mars atmosphere  [in Japanese]

    FUJIWARA Kohei , Harada Yuki , Shobako Shinichiro , Terajima Noboru

    … 火星の構造物建設にはアルミニウム合金が用いられると予想され,交流GTA溶接が適用される可能性が高い.\n火星の主成分であるCO2ガスを用いた低圧の擬似火星大気において,アルミニウム合金に対しArを用いた交流GTAを実施した.\n低圧かつCO2雰囲気において溶接継手内で発生・成長したブローホールを破断面より観察し,その発生機構について考察した. …

    Preprints of the National Meeting of JWS 2018f(0), 370-371, 2018

    J-STAGE

  • Visualization of the weld pool shape by laser ultrasonic technique in arc welding  [in Japanese]

    nomura kazufumi , Ryosuke Kita , Satoshi Otaki , Fumiya Imura , Satoru Asai

    アーク溶接プロセスのシミュレーションはこれまでにも国内外で報告されているが,その妥当性は溶接後の断面マクロの比較によって行われることがほとんどである.我々は,溶融池形状といった溶接中の状態をシミュレーション結果と実験的に照合できるようにするため,レーザ超音波法による溶融池形状のその場計測技術を開発している.本稿では,比較検討のための計測手法や温度補正法,および溶融池形状の可視化について報告する.

    Preprints of the National Meeting of JWS 2018f(0), 144-145, 2018

    J-STAGE

  • Visualization of Metal Vapor Behavior in Arc Plasma during GTA Welding  [in Japanese]

    Tanaka Keigo , Shigeta Masaya , Tanaka Manabu

    GTA溶接におけるヘリウムアークプラズマとステンレス鋼の溶融池から発生する鉄,クロム,マンガン蒸気の動的挙動を分光分析法によって観察した.その結果,鉄蒸気は母材表面近傍,クロム蒸気はアークプラズマ外縁部に分布し,マンガン蒸気は鉄蒸気よりも広範囲に分布するという,元素によって異なる挙動を示すことが観察された. …

    Preprints of the National Meeting of JWS 2017s(0), 6-7, 2017

    J-STAGE

  • Temperature Measurement by Two-Color Thermometry during GTA Welding  [in Japanese]

    yamashita shotaro , Yamamoto Motomichi , Shinozaki Kenji , Takeda Hiroyuki , Oami Shoko

    二色放射温度計測は,近年レーザ溶接中の温度計測に対して,非接触かつ正確な温度計測方法として適用されている.本研究では,従来よりアーク光の影響により溶接部の温度計測法として適用が困難とされてきた二色放射温度計測をTIG溶接中の温度計測へと適用した結果について報告する.

    Preprints of the National Meeting of JWS 2017f(0), 160-161, 2017

    J-STAGE

  • Control system for reducing weld spatter during the welding process by using high-speed visual sensing

    SUGAWARA Mai , KIYOMITSU Kaoru , TAKANO Rui , FUJIWARA Izumi , YAMAUCHI Yu , NAKAYAMA Takayoshi , TSUMURA Norimichi

    … <p>Robotic welding has been the biggest use in many industry. … To prevent flying weld spatter, the precursory phenomenon of weld spatter must be detected, and power source of robotic welding must be controlled to reduce before weld spatter occurs. … This study aimed to propose a control system to prevent the occurrence of flying weld spatter during laser or gas tungsten arc (GTA) welding process in real-time. …

    Mechanical Engineering Letters 3(0), 16-00679-16-00679, 2017

    J-STAGE

  • Elucidation of Grain Refinement Mechanism in Weld Metal of Type 310S Stainless Steel:- Grain Refinement in Weld Metal by Hot-wire GTAW Process -  [in Japanese]

    YAMASHITA Shotaro , SHINOZAKI Kenji , YAMAMOTO Motomichi , KADOI Kota

    … The aim of this study was to elucidate the grain refinement mechanism in weld metal of type 310S stainless steel by hot-wire GTA welding. … Quenched microstructure of weld pool during welding was obtained by liquid-tin and water quenching method. … Therefore, the grain refinement phenomenon in weld metal of type 310S stainless steel seemed to be a phenomenon unique to the hot-wire GTA welding. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 35(1), 36-44, 2017

    J-STAGE

  • Observations of AC-GTA Phenomenar under like Mars Atomosphere  [in Japanese]

    HAMANO Osamu , SHOBAKO Shinichiro , TERAJIMA Noboru , SOUMA Takeshi

    … 火星での構造物の建造技術として交流GTA溶接に注目している.擬似火星大気においてアルミニウム合金に対する交流GTAを高速度カメラで撮影し,放電形状の変化や陰極点挙動を観察した.CO2雰囲気および低圧という条件が, GTAやクリーニング作用に対して及ぼす影響を明らかにする. …

    Preprints of the National Meeting of JWS 2016f(0), 246-247, 2016

    J-STAGE

  • Theoretical Approach to Influence of Nitrogen on Solidification Cracking Susceptibility of Austenitic Stainless Steels:- Computer Simulation of Hot Cracking by Solidification/Segregation Models -  [in Japanese]

    OGURA Tomo , ICHIKAWA Shinya , SAIDA Kazuyoshi

    … The amount of nitrogen in Ar shielding gas during GTA melt-run welding was varied in order to vary the nitrogen content in the weld metals. … Numerical analysis of solidification segregation during welding revealed that the solid-liquid coexistence temperature range of SUS316L was enlarged with an increase in the nitrogen content in the weld metal, whereas that of SUS310S was almost constant regardless of the nitrogen content. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 34(3), 189-196, 2016

    J-STAGE

  • Effect of Welding Conditions on Heat Efficiency of GHTA Welding  [in Japanese]

    Tanaka Keigo , Shobako Shinichiro , Terajima Noboru

    … GHTA溶接法は,中空電極を用いることで真空環境下でのアーク放電を可能とした溶接法であり,GTA溶接法を基礎としている.円柱形のGHTAは,釣鐘形のGTAとは放電メカニズムが異なり,熱効率が高いと予想されている.そこで本研究では,水冷銅板陽極を真空チャンバー内に組込み,GHTAの熱効率を調査した. …

    Preprints of the National Meeting of JWS 2015f(0), 428-429, 2015

    J-STAGE

  • Three Dimensional Spectroscopy of Welding Arc Plasma by Multidirectional Simultaneous Method, 2nd Report  [in Japanese]

    MIMURA Kohei , KATAOKA Kotaro , NOMURA Kazufumi , HIRATA Yoshinori

    アーク溶接プロセスの高度な可視化手法として,本研究では多方向3次元分光計測手法を開発している.本稿では溶接アーク特有の断面発光強度分布を画像再構成法によって得る際に生じる問題に着目し,投影方向数の影響などを理論,実験の両方から評価した.

    Preprints of the National Meeting of JWS 2015s(0), 138-139, 2015

    J-STAGE

  • Evaluation of Solidification Cracking Susceptibility during Hot-wire GTA Welding  [in Japanese]

    Yamashita Shotaro , Iwasaki Ryohei , Shinozaki Kenji , Yamamoto Motomichi , Kadoi Kota , Obana Takeshi

    本報告では,ホットワイヤ法適用時の高温割れ感受性評価を検討した.トランスバレストレイン試験に,添加ワイヤを供給した溶材供給式トランスバレストレイン試験法を検討し,高能率・高品質な溶接プロセスであるホットワイヤTIG溶接時の高温割れ感受性を調査した結果を報告する.

    Preprints of the National Meeting of JWS 2015f(0), 118-119, 2015

    J-STAGE

  • Reliability evaluation of Fowler-Milne method in a temperature measurement of Gas Tungsten Arc  [in Japanese]

    KONISHI Kyohei , SHIGETA Masaya , TANAKA Manabu , MURATA Akihisa , MURATA Tadasuke , MURPHY Anthony B.

    GTA (Gas Tungsten Arc) welding has been used in manufacturing field and studied as a higher level welding process. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 33(1), 42-48, 2015

    J-STAGE

  • Basic Study for Automatic Control in Space GHTA welding : Brightness Characteristics on Various Plate Thickness in GTA Welding  [in Japanese]

    桃井 真 , 正箱 信一郎 , 吹田 義一 [他]

    宇宙科学技術連合講演会講演集 58, 6p, 2014-11-12

  • Numerical simulation of non-equilibrium plasma properties of helium gas tungsten arc  [in Japanese]

    Tashiro Shinichi , Konishi Kyouhei , Tanaka Manabu

    本講演ではヘリウムガスタングステンアークにおける非平衡プラズマ特性の数値シミュレーション結果について報告する。アークプラズマ-材料表面間等のアークプラズマが低温となる領域では、従来の局所熱平衡近似が困難となり非平衡プラズマとしての扱いが必要となる。

    Preprints of the National Meeting of JWS 2014f(0), 202-203, 2014

    J-STAGE

  • Aviation and Space (Materials)  [in Japanese]

    HIRAMATSU Noriyuki

    JOURNAL OF THE JAPAN WELDING SOCIETY 83(2), 117-123, 2014

    J-STAGE

  • Measurement of Martensitic Transformation of 9%Ni Steel during Welding Using ESPI System  [in Japanese]

    Meguro Susumu , Kobayashi Satoru , Nakamura Terumi , Tsuzaki Kaneaki

    … Displacement and strain during welding are important parameters for evaluation of weld joint. … So we applied electronic speckle pattern interferrometry (ESPI) system to measurement of displacement and strain during gas-tungsten-arc (GTA) welding of 9%Ni steel. …

    Tetsu-to-Hagane 100(5), 632-638, 2014

    J-STAGE

  • Characterization of Microstructure and Mechanical Properties of Inconel 625 and AISI 304 Dissimilar Weldments

    Ramkumar Kasinath Devendranath , Mithilesh Parvateneni , Varun Digumarthi , Reddy Ajay Reddy Gopi , Arivazhagan Natarajan , Narayanan Sockalingam , Kumar Kesavan Gokul

    … This investigation has been performed to characterize the microstructure and mechanical properties of the GTA and PCGTA welded dissimilar combinations of Inconel 625 superalloy and AISI 304 austenitic stainless steel. …

    ISIJ International 54(4), 900-908, 2014

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  • Phenomena in GTA and GHTA Welding under like Mars Atmosphere  [in Japanese]

    SUITA Yoshikazu , SHOBAKO Shinichiro , SHIRAI Mizuki , SATOU Ryouta , TERAJIMA Noboru , YAMASHITA Masahiro

    … To realize this, welding technology is expected to be applied. … In this study, welding experiments were carried out in a simulated Mars atmosphere of 99.5% carbon dioxide and a pressure of 700 Pa. … Conventional Gas Tungsten Arc (GTA) welding and Gas Hollow Tungsten Arc (GHTA) welding, in which arc operating gas is allowed only to flow out from the electrode tip of a hollow tungsten electrode, were investigated. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 32(2), 107-113, 2014

    J-STAGE

  • Numerical analysis of nitrogen absorption in GTA molten pool  [in Japanese]

    KODAMA S. , SUGIURAI K. , TSUJIMURA Y. , TANAKA M.

    GTA溶接における溶融池の窒素吸収現象を数値解析により考察した。 …

    Preprints of the National Meeting of JWS 93, 64-65, 2013-08-12

    J-STAGE References (1)

  • Contribution for Heat Transfer and Heat Flux to Anode Affected by Rise Current Transition Time in Pulsed Arc  [in Japanese]

    MOMII Taira , IWAO Toru , YUMOTO Motoshige

    … Gas tungsten arc (GTA) welding is a high-quality joining technology. … However, the TIG welding cannot melt the welding pool deeply. … Therefore, the weld defect sometimes occurs at TIG welding because of this poor heat transfer to the anode and ability of melting deeply. … In addition, the welding speed becomes slow, and the productivity is decreased. …

    IEEJ Transactions on Power and Energy 133(5), 409-416, 2013-05-01

    J-STAGE References (18) Cited by (1)

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