Search Results 1-20 of 1913

  • Numerical Simulation on Effect of Microstructure on Hydrogen-induced Cracking Behavior in Duplex Stainless Steel Weld Metal

    Ogita Gen , Matsumoto Koki , Mochizuki Masahito , Mikami Yoshiki , Ito Kazuhiro

    … <p>Duplex stainless steels and their deposited weld metal have ferrite and austenite microstructures with different material properties. … In addition, the microstructure of the base metal and weld metal clearly differs, affecting hydrogen diffusion and accumulation, and hydrogen-induced cracking behavior at the microstructural scale. …

    ISIJ International, 2020

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  • A STUDY ON WELDABILITY OF HIGH STRENGTH REINFORCING BARS (PART 2): EVALUATION BY HEAT-AFFECTED ZONE FRACTURE  [in Japanese]

    YABE Yoshitaka , NARIHARA Hiroyuki , NAKAGOMI Tadao

    … <p> In the previous paper (Part 1) of this study, the weldability of high-strength reinforcing bars was evaluated from the viewpoint of the occurrence of weld cracks, and the effect of changes in the chemical compositions on weld cracks was experimentally investigated. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) 85(776), 1245-1253, 2020

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  • Study of Shieldability of the Low Hydrogen Welding Process by Numerical Simulation  [in Japanese]

    MUKAI Naoki , TASHIRO Shinichi , MURPHY Anthony B. , INOUE Yoshihide , SUGA Tetsuo , TANAKA Manabu

    … Cold cracking sensibility is severe problem in the welding fabrication of large-scale steel structures. … The calculated results ofthe model were in good agreement with the observed results by the Shadowgraph method and the nitrogen content of weld metal. …

    Journal of Smart Processing 9(4), 199-207, 2020

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  • Influence of Microstructure Evolution on Reheat Cracking Behavior of T23 Steel Weld Joint

    Xu Mengjia , Liu Bosheng , Dong Zhibo , Wang Zhenmin

    … <p>In this work, T23 steel was treated by two thermal cycles, to simulate the second heating process in coarse grained heated affected zone (CGHAZ) of weld. … Meantime, the effect of microstructure evolution on reheat cracking sensitivity was investigated by using strain-to-fracture (STF) tests. … The relevancy between the grain boundary character and reheat cracking sensitivity were analyzed quantitatively using fractal analysis. …

    ISIJ International 60(6), 1291-1300, 2020

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  • A STUDY ON WELDABILITY OF HIGH STRENGTH REINFORCING BARS (PART 1): EVALUATION BY WELD CRACKING  [in Japanese]

    YABE Yoshitaka , NARIHARA Hiroyuki , NAKAGOMI Tadao

    weld cracks in welds do not occur and the heat-affected zone fractures which lead to decline the joint performance do not occur.</p><p> In this study (part1), at first, focusing on weld cracking, we investigated experimentally the effect of changes of indices such as the carbon content, the carbon equivalent, and the weld cracking susceptibility composition of high strength reinforcing bars on occurrence of weld

    Journal of Structural and Construction Engineering (Transactions of AIJ) 85(770), 455-461, 2020

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  • Evaluation of Crack Sensitivity of Aluminum Alloy Welds by Various Cracking Tests  [in Japanese]

    Okubo Michinori , Nagai Kaori , Shinoda Kiyoshi

    … The weld crack sensitivity of aluminum alloys is influenced by factors such as the welding process, base metal, filler metal, welding conditions, stress, and restraint. … Consequently, the relationship between sensitivity to cracking and the tensile stress added to the base metal could be determined. … The TIG and MIG spot weld crack tests used a plate thickness of 6.0 mm and the filler metal for MIG welding was A5025-WY (Al-Mg-Si-Sc). …

    Journal of Light Metal Welding 58(Supplement), 24s-28s, 2020

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  • Low cycle fatigue evaluation of cruciform welded joints containing incomplete penetration  [in Japanese]

    Hanji Takeshi , Ohashi Yuko , Tateishi Kazuo , Shimizu Masaru

    … Six types of specimens with different sizes of weld penetrations and weld leg lengths were tested under cyclic plastic strains. … The test results revealed that the fatigue strength and cracking patterns depend on the ratio of the weld penetration to the main plate thickness and the ratio of the weld leg length to the main plate thickness, respectively. …

    Journal of Structural Engineering, A 66A(0), 253-263, 2020

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  • Numerical Simulation on Effect of Microstructure on Hydrogen-induced Cracking Behavior in Duplex Stainless Steel Weld Metal  [in Japanese]

    Ogita Gen , Matsumoto Koki , Mochizuki Masahito , Mikami Yoshiki , Ito Kazuhiro

    … <p>Duplex stainless steels and their deposited weld metal have ferrite and austenite microstructure, which have material properties that are different. … In addition, the microstructure of the base metal and weld metal are clearly different; … therefore, it affects the hydrogen diffusion and accumulation, and hydrogen-induced cracking behavior at the microstructural scale. …

    Tetsu-to-Hagane 106(4), 224-234, 2020

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  • Prevention of Cold Cracking by the Welding Process for Reducing Diffusible Hydrogen in High-Tensile Thick Plate Welding  [in Japanese]

    MUKAI Naoki , INOUE Yoshihide , SASAKURA Shuji , KINOSHITA Yuta

    … Cold cracking sensibility is severe problem in the welding fabrication of large-scale steel structures. … It is well-known that diffusible hydrogen content in the weld metal strongly influences this cracking. … By using this process, amount of hydrogen content in the weld metal can be highly reduced than the conventional process. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(1), 41-51, 2020

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  • Hot Cracking Susceptibility of Commercial Filler Metals for Alloy 617 by Varestraint Test:-Study of Hot Cracking of Alloy 617 in Multipass Welds-  [in Japanese]

    YAMASHITA Shotaro , KAMIMURA Kenji , NIKI Takahiro , OGURA Tomo , SAIDA Kazuyoshi

    … Solidification cracking and liquation cracking susceptibility of four kinds of alloy 617 commercial filler metals were evaluated by Varestraint test, in order to clarify a fundamental effect of each solute element in the alloy. … Fracture surface of cracking in alloy 617 multipass welds by GTA welding exhibited a possibility of occurrence of both solidification cracking and liquation cracking. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(1), 1-10, 2020

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  • Humid Gas Stress Corrosion Cracking in MIG-Welded 5083 Aluminum Alloy Plate

    Ghorani Alireza , Itoh Goroh , Ohbuchi Tomoyuki , Kiuchi Tomoya

    … The local Mg content will become higher than 5% due to solidification segregation in the weld joint of 5083 alloy. … In this study, resistance to HE of MIG-welded 5083 aluminum alloy at three areas (weld center, weld corner and HAZ) was investigated by newly developed humid gas stress corrosion cracking (HG-SCC) test. …

    MATERIALS TRANSACTIONS 61(2), 330-338, 2020

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  • Evaluation of Reheat Cracking Susceptibility in High Strength Austenitic Stainless Steels  [in Japanese]

    NOMURA Kyohei , KUBUSHIRO Keiji

    … <p>In order to assess the susceptibility to reheat cracking of high-strength austenitic stainless steels of KA-SUS304J1HTB and KA-SUS310J1TB, we established a reheat cracking reproduction test method by using stress relaxation test. … These findings were in close accordance with the previously reported characteristics of the reheat cracking cases. …

    Journal of the Society of Materials Science, Japan 69(1), 105-110, 2020

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  • Effect of Adjacent Weld-Bead on Cold Cracking and Fatigue Strength  [in Japanese]

    米澤 隆行 , 大川 鉄平 , 橋場 裕治 , 堤 駿 , 内野 一成

    日本船舶海洋工学会講演会論文集 Conference proceedings, the Japan Society of Naval Architects and Ocean Engineers (29), 355-357, 2019-11

  • FUNDAMENTAL STUDY ON LIQUID METAL ASSISTED CRACKING OCCURRED AT VENT AND DRAIN HOLES DURING HOT-DIP GALVANIZING  [in Japanese]

    ASADA Hayato , TANAKA Tsuyoshi , YAMASHITA Tatsuo , FUJIWARA Yuki

    … In this process, liquid metal assisted cracking (LMAC) has sometimes occurred at vent and drain holes which were located at the corner of welded beam-to-column connection during hot-dip galvanizing. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (762), 1033-1042, 2019-08

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  • SCC Growth Behavior of Welds and Cast of Stainless Steels in Oxygenated High-Temperature Water : Influence of Water Chemistry and Test Temperature  [in Japanese]

    山田 卓陽 , 寺地 巧 , 岡本 マキエ , 有岡 孝司

    INSS journal : Journal of the Institute of Nuclear Safety System 26, 136-144, 2019

  • SCC Potential Assessment in Butt Welded Zone of Medium-Diameter Pipe  [in Japanese]

    NAKANO Yosuke , TOYOSHIMA Yoshiteru , ISHII Yuya , MIYATA Yuka , YANAGIDA Nobuyoshi

    … <p>The purpose of this study is to evaluate the risk of Stress Corrosion Cracking (SCC) initiation to medium-diameter 200A and 250A low-carbon stainless steel piping. …

    The Proceedings of the Materials and Mechanics Conference 2019(0), OS1304, 2019

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  • The Effect of Cold Cracking Prevention of FCAW by the Welding Process for Reducing Diffusible Hydrogen  [in Japanese]

    MUKAI Naoki , INOUE Yoshihide , TASHIRO Shinichi , SUGA Tetsuo , TANAKA Manabu

    … Cold cracking sensibility is severe problem in the welding fabrication of large-scale steel structures. … It is well-known that diffusiblehydrogen content in the weld metal strongly influences this cracking. … Byusing this process, amount of hydrogen content in the weld metal can be highly reduced than the conventional process. … In this study,the effect of cold cracking prevention in FCAW by new low hydrogen process was confirmed. …

    Journal of Smart Processing 9(1), 33-37, 2019

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  • INFLUENCE EVALUATION OF SAMPLING METHODS OF THE NON-DESTRUCTIVE EXAMINATION ON FAILURE PROBABILITY OF PIPING BASED ON PROBABILISTIC FRACTURE MECHANICS ANALYSES

    Mano Akihiro , Katsuyama Jinya , Li Yinsheng

    … For the welds where stress corrosion cracking is not postulated based on their service environment and countermeasures for the degradation mechanism, a set of NDEs is performed in each 10-year interval, and the extent of examination for each interval is specified in the rules. … Probabilistic fracture mechanics (PFM) analysis which is one of the structural integrity assessment methods can quantitatively evaluate failure probability of a weld considering NDE through probability of crack detection. …

    The Proceedings of the International Conference on Nuclear Engineering (ICONE) 2019.27(0), 2334, 2019

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  • Relationship between Reheat Cracking and Carbide Formation in Weld Metal of Heat-Resisting Alloy  [in Japanese]

    MAGOMOTO Yoshiki , YAMASHITA Shotaro , OGURA Tomo , SAIDA Kazuyoshi , OSUKI Takahiro , KURIHARA Shinnosuke , JOTOKU Kana

    石炭焚き火力発電において従来より高効率化を図るため,蒸気温度約700 度 での運用が期待されるA-USC 発電プラントへの転換が進められている.700 oC 環境下における十分なクリープ強度を持つ耐熱合金が適用材料として検討されているが,運用中の時効脆化割れの発生が懸念されている.本研究では,割れの要因のうち炭化物の生成挙動に注目し,A-USC 用耐熱合金溶接部の時効脆化割れとの関係について調査し …

    Preprints of the National Meeting of JWS 2019f(0), 20-21, 2019

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  • Investigation of Standardizing for Evaluation Method of Transverse Varestraint Test  [in Japanese]

    KADOI Kota , OKANO Shigetaka , YAMASHITA Shotaro , ABE Daisuke , TAKEMORI Akira , YAMADA Shinnosuke , TAKADA Atsushi , KAWATA Junichi

    … Varestraint test is one of the most-used methods to evaluate weld solidification cracking susceptibility. … Maximum crack length must be appropriate evaluation index for solidification cracking susceptibility compared to the total crack length and the crack number. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 37(4), 200-207, 2019

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