Search Results 1-20 of 748

  • Numerical simulation for behavior of porosity in weld pool during laser welding of aluminum and optimization of welding condition  [in Japanese]

    Nitta Hiroyuki , Shibayanagi Toshiya , Yamane Takeshi , Tanaka Manabu

    … <p>The present paper deals with the behavior of porosity under an influence of convection in the weld pool during laser welding of aluminum by means of a numerical simulation developed by the authors. …

    Journal of Japan Institute of Light Metals 71(3), 137-143, 2021

    J-STAGE 

  • Numerical Simulation of Wire+arc Additive Manufacturing Process by GMAW Weld Pool Model  [in Japanese]

    OGINO Yosuke

    JOURNAL OF THE JAPAN WELDING SOCIETY 90(2), 98-101, 2021

    J-STAGE 

  • Visualization of weld pool using CMOS camera and adaptive control  [in Japanese]

    山根 敏

    画像ラボ 31(9), 39-47, 2020-09

  • Process map of Laser Beam Powder Bed Fusion for Nickel-Based Superalloy Created by Numerical Analysis Considering Melting and Solidification  [in Japanese]

    IKESHOJI Toshi-Taka , YONEHARA Makiko , KYOGOKU Hideki

    … For Inconel 718 alloy, the melting and solidification phenomenon around the laser track was numerically calculated using the physical properties of the powder, solid, and liquid in the range of laser scanning speed 750-1500mm/s and laser output 150-300W, and the weld pool size was calculated.</p> …

    The Proceedings of Mechanical Engineering Congress, Japan 2020(0), S04109, 2020

    J-STAGE 

  • The automated horizontal-penetration welding technique using U-Net based image recognition of the weld pool  [in Japanese]

    OZAKI Keita , OKAMOTO Akira , KOIKE Takeshi , KIMURA yuji , ISHIZAKI Keito , FURUKAWA Naohide

    自動化できていない溶接施工法の一つに、横向き姿勢におけるギャップ有りV型開先ワークの片面初層CO2溶接がある。裏当て材なしでギャップ3~7mmを対象に、画像センサを活用した自動溶接技術の開発に取組んでおり、本報では、U-Net構造の畳み込みニューラルネットワークによる溶融池画像認識手法および運棒制御による溶接自動化技術について報告する。

    Preprints of the National Meeting of JWS 2020f(0), 236-237, 2020

    J-STAGE 

  • Application of Deep Learning to Image Processing of Weld Pool  [in Japanese]

    ChuanZhi Wang , GeWei Zhang , Ning Li , YAMANE Satoshi

    本研究において、機械的に画像の特徴を捉えるために、新しい技術の可能性についてを検討した。構築したネットワークを用いて、パソコンが自動的にノイズを除去し、特徴点を識別できるようにする。具体的は、深層学習を活用して、溶接池の特徴点を自動的に抽出できるような画像識別技術を構築する。

    Preprints of the National Meeting of JWS 2020f(0), 230-231, 2020

    J-STAGE 

  • Study on estimation of the weld penetration by deep leaming model in weld pool monitoring (2nd Report)  [in Japanese]

    NOMURA Kazufumi , FUKUSHIMA Koki , MATSUMURA Takumi , SANO Tomokazu , ASAI Satoru

    本研究は溶接中の溶融池をカメラによりモニタリングし,その視覚情報のみを元にして溶込み深さを推定するものである.入力として溶融池画像を,出力として数断面から得た溶込み深さを用いてCNNによる深層学習モデルを作成し,未知データであるギャップ変動を含むレ型開先マグ溶接における溶込み深さを推定した.その結果,約85%が誤差0.5mm以下という精度で溶込みを推定できた.また,訓練データの質,画質の影響なども …

    Preprints of the National Meeting of JWS 2020f(0), 232-233, 2020

    J-STAGE 

  • Development of monitoring method of welding phenomena based on arc and weld pool emission property:-Part 3 Discussion by spectroscopy and numerical simulation-  [in Japanese]

    OGINO Yosuke , FUKUMOTO Satoshi , ASAI Satoru , SANO Tomokazu , KASANO Kazuki

    アーク溶接における溶接品質および異常検知技術のひとつとして画像センシングによるインプロセスモニタリング技術の開発を行っている.本報告においては,非常に強い発光を伴うアークプラズマ直下およびその後方領域における溶融池表面を広範囲に明瞭にとらえるための手法,ならびにそれに対してアークプラズマ・溶融池の発光特性が及ぼす影響について分光分析や数値シミュレーションを活用し検討を行った結果について示す.

    Preprints of the National Meeting of JWS 2020f(0), 222-223, 2020

    J-STAGE 

  • Spectroscopic Measurement of the Arc and the Weld Pool in Robotic Welding

    KOMAYA Daiki , YAMANE Satoshi

    … In an automatic welding system using a visual sensor, it is necessary to clearly observe the weld pool to control the welding phenomenon with a visual sensor. … However, since the arc light is too strong, it is difficult to take clear weld pool images. … Therefore, the spectral distribution of the weld pool and arc light in plasma arc welding and pulse MAG welding was measured changing the current. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(2), 59s-63s, 2020

    J-STAGE 

  • A unique CEL numerical method on material flow in a molten pool of workpiece vibration assisted welding

    Habib Hamed Zargari , Ito Kazuhiro , Mikami Yoshiki , Abhay Sharma

    … Workpiece vibration has been applied during arc welding to make weld metal microstructure fine and reduce weld defects such as the blow holes. … The velocity ofmolten materials through the designated zone of the weld pool was investigated with and without the workpiece vibration. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(2), 54s-58s, 2020

    J-STAGE 

  • Numerical study of keyhole behaviors and thermal fluid flow in high current plasma arc welding

    WU Dongsheng , TASHIRO Shinichi , HUA Xueming , TANAKA manabu

    … A fully coupled plasma arc-keyhole-weld pool model was developed to investigate the keyhole behaviors and thermal fluid flow in high current plasma arc welding. … The dominant downward plasma shear stress and negative arc pressure in the z direction cause a dominant anti-clockwise eddy in the weld pool. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(2), 40s-43s, 2020

    J-STAGE 

  • Imaging Spectroscopy for Transient Transport of Chromium Vapor During Helium TIG Welding

    TANAKA Keigo , SHIGETA Masaya , TANAKA Manabu , MURPHY Anthony B.

    … During TIG welding, the metal vapor generated from the weld pool surface is transported to the arc plasma. … In contrast, the Cr I and Cr II spectral intensities gradually increased near the weld pool, near the electrode and the intermediate region. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(2), 21s-24s, 2020

    J-STAGE 

  • Three-Dimensional Simulation of Gas Metal Arc Welding Process Using Particle-Grid Hybrid Method  [in Japanese]

    KOMEN Hisaya , TANAKA Manabu , TERASAKI Hidenori

    … A gas metal arc welding phenomena simulator was developed, which simultaneously computed an arc plasma behavior and a weld pool formation process with the time evolution by alternately conducting the particle method and the grid method calculations. … As a result, a weld pool was swelled up by the transportation of molten metal droplets with the time evolution and it was solidified after the heat source passed. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(2), 25s-29s, 2020

    J-STAGE 

  • Comparative study of solidification behaviors of weld pool through modelling of heat transfer and fluid flow during single- and multiplelayer deposits of 2319-aluminum alloy based on variable polarity gas tungsten arc welding

    DU Jun , GENG Ruwei , WEI Zhengying , Ninshu Ma

    … It was found that under the same process parameters, the cooling rate and the solidification rate of the molten pool for the single-layer deposition process are always greater than that for the multiplelayer deposition process. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(2), 112s-115s, 2020

    J-STAGE 

  • Numerical study of the effects of short-circuiting current on a controlled short-circuit transfer process  [in Japanese]

    EDA Satoshi , OGINO Yosuke , ASAI Satoru

    … In this study, a controlled short-circuit transfer process is modeled in two-dimensions to clarify the metal transfer and weld pool phenomena during the process. … We revealed that the electromagnetic force induced by short-circuiting current has a large effect on the weld formation process. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(4), 392-402, 2020

    J-STAGE 

  • Numerical simulation of weld pool formation in submerged arc welding process  [in Japanese]

    OGINO Yosuke , IIDA Masahiro , ASAI Satoru , KOZUKI Shohei , HAYAKAWA Naoya , IKEDA Rinsei

    … In this study, a numerical simulation model of the weld pool formation in the submerged arc welding process is constructed to visualize the phenomena. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(4), 355-362, 2020

    J-STAGE 

  • Numerical Modeling of the Inclusion Behavior during AC Flash Butt Welding

    Siddiqui Md Irfanul Haque , Geleta Dereje Degefa , Bae Gyuyeol , Lee Joonho

    … <p>The entrapment of inclusions in the solidified weld zone is detrimental to its mechanical properties. … In an AC flash welding process, the upsetting rate, the initial temperature of the weld pool, and the size of inclusions may affect the final distribution of the inclusions. …

    ISIJ International 60(11), 2503-2511, 2020

    J-STAGE 

  • High-Efficiency and Low-Heat-Input CO2 Arc-Welding Technology for Butt Joint of Thick Steel Plate Using Hot Wire

    Somchai WONTHAISONG , SHINOHARA Shinichiro , SHINOZAKI Kenji , Rittichai PHAONIAM , YAMAMOTO Motomichi

    … Stable welding phenomena, such as molten pool formation and hot-wire feeding during welding, were observed for all tested conditions. … Use of a higher hot-wire feeding speed with a lower welding current enabled a lower dilution ratio, narrower width of the heat-affected zone, and higher weld metal hardness owing to the resultant lower molten pool temperature and higher cooling speed. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(3), 164-170, 2020

    J-STAGE 

  • Tracking the Welding Line in Lap Welding Using Pattern Matching

    Yamane Satoshi

    … An arc sensor was employed by oscillating the welding torch in a thick weld. … To trace the welding line, the weld pool in pulsed metal active gas (MAG) welding under the shielding gas of Ar 80% and CO<sub>2</sub> … The weld pool was observed in the rear to the welding direction. … The features of the weld pool were investigated to recognize the welding line. …

    ISIJ International 60(8), 1752-1757, 2020

    J-STAGE 

  • In-process monitoring of weld quality in thin plate lap welding by using image sensing  [in Japanese]

    NITTA Seiya , OGINO Yosuke , ASAI Satoru

    … The weld pool shape during the welding process is obtained by a compact CMOS camera and the relationship between the weld pool shape and weld quality is discussed. … The weld quality depends on the target position, the gap conditions. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(2), 114-124, 2020

    J-STAGE 

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