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Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society最新文献

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Numerical Simulation of Heat Source Characteristics in Arc Spot Welding with Constricted Nozzle 窄喷嘴电弧点焊热源特性的数值模拟
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society Pub Date : 2021-01-01 DOI: 10.2207/qjjws.39.132
Hisaya Komen, Manabu Tanaka, A. Murata, Murata Tadasuke
{"title":"Numerical Simulation of Heat Source Characteristics in Arc Spot Welding with Constricted Nozzle","authors":"Hisaya Komen, Manabu Tanaka, A. Murata, Murata Tadasuke","doi":"10.2207/qjjws.39.132","DOIUrl":"https://doi.org/10.2207/qjjws.39.132","url":null,"abstract":"** , TANAKA Manabu *** , MURATA Akihisa **** and MURATA Tadasuke **** Two-dimensional axisymmetric simulation was carried out to investigate heat source characteristics during an arc spot welding with a constricted nozzle. As a result, it was clarified that a part of the welding current flowed from a cooling nozzle which was an anode to a tungsten cathode directly. The temperature increase of the cathode tip was suppressed by the decrease of the Joule heating at the tip because of this separation of the current path. Comparing temperature and heat input density distributions on a base metal surface with a conventional tungsten inert gas (TIG) welding, there was no difference in the temperature on the central axis of the tungsten cathode, but the peak of the heat input density during the arc spot welding was lower than that in the TIG welding. In addition, the heat input range was narrower than that in the TIG welding by a cooling nozzle contacting the base metal. It was also clarified that the heat input to the base metal surface and the temperature increase of the tungsten electrode were suppressed by the nozzle. Inner gas flowing from the constricted nozzle cooled the outer edge of the arc plasma, suggesting that it contributed to the long lifetime of the tungsten electrode.","PeriodicalId":39980,"journal":{"name":"Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67996166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multi-physics Analysis for Spot Welding 点焊的多物理场分析
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society Pub Date : 2021-01-01 DOI: 10.2207/JJWS.90.176
S. Hirano, S. Fukumoto, Shinji Koyama
{"title":"Multi-physics Analysis for Spot Welding","authors":"S. Hirano, S. Fukumoto, Shinji Koyama","doi":"10.2207/JJWS.90.176","DOIUrl":"https://doi.org/10.2207/JJWS.90.176","url":null,"abstract":"","PeriodicalId":39980,"journal":{"name":"Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society","volume":"90 1","pages":"176-176"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68676091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Participation Report of the ASME Pressure Vessels & Piping 2020 Conference (PVP 2020) ASME压力容器与管道2020年会议(PVP 2020)参会报告
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society Pub Date : 2021-01-01 DOI: 10.2207/JJWS.90.215
Fuminori Iwamatsu
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引用次数: 0
What I Think Back in My 40th Year of Research Work 回顾我40年的科研工作
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society Pub Date : 2021-01-01 DOI: 10.2207/JJWS.90.230
T. Kasuya
{"title":"What I Think Back in My 40th Year of Research Work","authors":"T. Kasuya","doi":"10.2207/JJWS.90.230","DOIUrl":"https://doi.org/10.2207/JJWS.90.230","url":null,"abstract":"","PeriodicalId":39980,"journal":{"name":"Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society","volume":"14 1","pages":"230-233"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68677390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Approaches and Future Developments about Evaluation of Hydrogen Diffusion Behavior in Resistance Spot Welds 电阻点焊中氢扩散行为评价方法及未来发展
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society Pub Date : 2021-01-01 DOI: 10.2207/JJWS.90.257
Nao Kawabe
{"title":"Approaches and Future Developments about Evaluation of Hydrogen Diffusion Behavior in Resistance Spot Welds","authors":"Nao Kawabe","doi":"10.2207/JJWS.90.257","DOIUrl":"https://doi.org/10.2207/JJWS.90.257","url":null,"abstract":"","PeriodicalId":39980,"journal":{"name":"Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society","volume":"90 1","pages":"257-258"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68677663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
R&D of Digital Twin for Ship Structures 船舶结构数字孪生体的研究与开发
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society Pub Date : 2021-01-01 DOI: 10.2207/JJWS.90.36
M. Fujikubo
{"title":"R&D of Digital Twin for Ship Structures","authors":"M. Fujikubo","doi":"10.2207/JJWS.90.36","DOIUrl":"https://doi.org/10.2207/JJWS.90.36","url":null,"abstract":"","PeriodicalId":39980,"journal":{"name":"Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society","volume":"90 1","pages":"36-43"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68678494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Creep Strength and Microstructure of Heat-affected Zone on 9Cr-3W-3Co-Nd-B Heat-resistant Steel 9Cr-3W-3Co-Nd-B耐热钢热影响区的蠕变强度和显微组织
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society Pub Date : 2021-01-01 DOI: 10.2207/JJWS.90.436
Hamaguchi Tomoaki
{"title":"Creep Strength and Microstructure of Heat-affected Zone on 9Cr-3W-3Co-Nd-B Heat-resistant Steel","authors":"Hamaguchi Tomoaki","doi":"10.2207/JJWS.90.436","DOIUrl":"https://doi.org/10.2207/JJWS.90.436","url":null,"abstract":"","PeriodicalId":39980,"journal":{"name":"Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society","volume":"90 1","pages":"436-440"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68678948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on Practical Application for In-process Detection Method of Blowholes 工艺中气孔检测方法的实际应用研究
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society Pub Date : 2021-01-01 DOI: 10.2207/qjjws.39.334
Kazuki Kasano, Y. Ogino, T. Sano, S. Asai
{"title":"Study on Practical Application for In-process Detection Method of Blowholes","authors":"Kazuki Kasano, Y. Ogino, T. Sano, S. Asai","doi":"10.2207/qjjws.39.334","DOIUrl":"https://doi.org/10.2207/qjjws.39.334","url":null,"abstract":"アーク溶接技術は素材同士を接合し製品を製造する上で , 製品品質と製造効率に直結するコア技術である .溶接工程で は溶接継手の品質を保証する為に溶接後検査工程を設ける 事が多いものの,溶接後検査工程において品質上の問題が 生じた場合には,製品は補修工程に流され対処される .こう した補修工程は製造コスト増加および手戻りによる製造効 率の低下の一因となる.その為 ,今後より一層の溶接品質と 溶接効率の両立に向けては,溶接中にインプロセスで異常 検知・予知ができ,異常を検知・予知した瞬間に溶接を停 止し,後工程への異常品の流出を最小限に留める事が要求 される.溶接後検査で手直しとなる要因の一つに溶接部で 発生した溶接欠陥が挙げられる.溶接欠陥の中でも,外観 検査では発見が困難なブローホール (Blow Hole, BH)といっ た内部溶接欠陥は,グラインダーによる研削やガウジング による溶接ビードをはつり後に再度溶接を行う必要があり, 手直し工数の増加および溶接欠陥低減に向けた対策を講じ るのに時間を要する事につながり課題となる. インプロセスでの溶接欠陥が発生したことの検知につな がる技術は従来から種々取り組まれてきている.溶接後の 溶接欠陥検査で用いられる超音波探傷試験 (Ultrasonic Testing, UT)を自動化した自動UT技術,UTに加えてアコー スティック・エミッション試験 (Acoustic Emission Testing, AET)を組み合わせた技術,レーザーを用い母材内部に励 起された超音波を計測用レーザーで捉える非接触式レー ザーUT技術が開発されている.これらの技術では溶接欠 陥が発生したことを検知でき,インプロセスで溶接欠陥発 生の検知が可能であるものの,溶接欠陥が発生した後での 検知に限られる.一方,溶接中に得られる情報を解析する ことによりインプロセスで溶接欠陥が発生したことを検知, もしくは溶接欠陥が発生し易い状態であることを判定し, 溶接欠陥発生を事前に抑止する技術も種々報告されている. 溶接中の電流・電圧波形計測結果から,短絡発生頻度・周 期を分析する技術,短絡移行形態ではないグロビュール・ スプレー移行形態時における電流・電圧波形の変動を分析 する技術,パルス TIGのパルスピーク・ベース波形の変動 周期を分析する技術,といった手法が報告されている. 電流・電圧波形と同様に溶接中に得られる情報として,溶 接時に発せられる音を集音し,正常時と異常時の音波形を 分析する技術も報告されている.また,電流・電圧波形, 溶接音に加えて,溶接速度・ウィービング幅・シールドガ ス流量といった溶接中の種々の情報を統合して収集し,分 析する技術も併せて報告されている.いずれの技術も溶 接中に得られた情報を統計的手法もしくは機械学習を活用 し解析することにより,溶接欠陥が発生したことを検知も しくは溶接欠陥の発生を予測することが可能である.これ らの技術はインプロセスでの溶接欠陥発生検知および発生 予測が可能であるものの,施工条件が変更になった場合に は検知指標に用いているしきい値を再設定する必要がある. 加えて,電流・電圧波形や溶接音に認められる異常は溶接 欠陥だけではなく,種々の外乱によっても引き起こされる インプロセスでのブローホール発生検知手法の実用化に向けた検証","PeriodicalId":39980,"journal":{"name":"Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67996125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Report of the WELNET online group seminar (Evening talking) WELNET在线小组研讨会报告(夜谈)
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society Pub Date : 2021-01-01 DOI: 10.2207/JJWS.90.144
Hiroto Shoji
{"title":"Report of the WELNET online group seminar (Evening talking)","authors":"Hiroto Shoji","doi":"10.2207/JJWS.90.144","DOIUrl":"https://doi.org/10.2207/JJWS.90.144","url":null,"abstract":"","PeriodicalId":39980,"journal":{"name":"Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society","volume":"90 1","pages":"144-144"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68675902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Automation of Laser Welding Process by Cyber-Physical System (CPS) Approach 基于信息物理系统(CPS)方法的激光焊接过程自动化
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society Pub Date : 2021-01-01 DOI: 10.2207/JJWS.90.30
Sakai Tetsuo, Washitani Taisuke, Shin'ya Kudo, Shiomi Yasutomo, Masakazu Kikawada, M. Sasaki, Masatoshi Hirono
{"title":"Automation of Laser Welding Process by Cyber-Physical System (CPS) Approach","authors":"Sakai Tetsuo, Washitani Taisuke, Shin'ya Kudo, Shiomi Yasutomo, Masakazu Kikawada, M. Sasaki, Masatoshi Hirono","doi":"10.2207/JJWS.90.30","DOIUrl":"https://doi.org/10.2207/JJWS.90.30","url":null,"abstract":"","PeriodicalId":39980,"journal":{"name":"Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society","volume":"90 1","pages":"30-35"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68677868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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