Hisaya Komen, Manabu Tanaka, A. Murata, Murata Tadasuke
** , 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.
{"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":null,"pages":null},"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}
{"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":null,"pages":null},"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}
{"title":"Participation Report of the ASME Pressure Vessels & Piping 2020 Conference (PVP 2020)","authors":"Fuminori Iwamatsu","doi":"10.2207/JJWS.90.215","DOIUrl":"https://doi.org/10.2207/JJWS.90.215","url":null,"abstract":"","PeriodicalId":39980,"journal":{"name":"Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68676941","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}
{"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":null,"pages":null},"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}
{"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":null,"pages":null},"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}
{"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":null,"pages":null},"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}
{"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":null,"pages":null},"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}
{"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":null,"pages":null},"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}
{"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":null,"pages":null},"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}
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