Development of low vacuum laser welding technique using an aerodynamic window
In order to realize deep laser welding, conceptual application of a supersonic jet as an aerodynamic window was investigated. Detailed characteristics of the supersonic jet as the aerodynamic window were studied experimentally. Flow field of the supersonic jet was examined based on the schlieren flo...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2018-11-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/84/868/84_18-00280/_pdf/-char/en |
| _version_ | 1811317684181139456 |
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| author | Tatsuro UCHIDA Takeshi FUKUDA Hisashi MATSUDA |
| author_facet | Tatsuro UCHIDA Takeshi FUKUDA Hisashi MATSUDA |
| author_sort | Tatsuro UCHIDA |
| collection | DOAJ |
| description | In order to realize deep laser welding, conceptual application of a supersonic jet as an aerodynamic window was investigated. Detailed characteristics of the supersonic jet as the aerodynamic window were studied experimentally. Flow field of the supersonic jet was examined based on the schlieren flow visualization technique. As compared to a free-vortex flow design applied to the aerodynamic window nozzle, in the case of supersonic jet, oblique shock waves were captured both at the nozzle exit edge and the shear layer on the aerodynamic window. The velocity field under the condition that the shock - expansion wave was formed in the aerodynamic window was measured by the PIV (Particle Image Velocimetry) system (Koncerto II, Seika Digital Image Corp.) . Both the vorticity magnitude and angular momentum were analyzed. Level of the vorticity magnitude in the core region of the supersonic jet was smaller by one-order than that in the shear layer in the region corresponding to the passage of laser-light (θ = 30 to 40° and r = 23.8 to 27.1 mm). The radial and circumferential velocity product in this region was similar to that observed under the free-vortex condition. In addition to the measurement mentioned above, pressure behavior was investigated using a multi-pressure measuring system (Scanivalve Corp. ZOC33). When the reservoir pressure was set at 800 kPa and diffuser width as 30.0mm, cavity pressure was reduced to 10.0 kPa. Under this reduced pressure environment, penetration depth increased by 2.6 times compared to penetration depth under atmospheric pressure environment. The effectiveness of the supersonic free-vortex aerodynamic window system tested in the high power laser welding manufacturing has been proven by the present study. |
| first_indexed | 2024-04-13T12:12:35Z |
| format | Article |
| id | doaj.art-4829449175aa40f6a35d21655345a8b0 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-13T12:12:35Z |
| publishDate | 2018-11-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-4829449175aa40f6a35d21655345a8b02022-12-22T02:47:26ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612018-11-018486818-0028018-0028010.1299/transjsme.18-00280transjsmeDevelopment of low vacuum laser welding technique using an aerodynamic windowTatsuro UCHIDA0Takeshi FUKUDA1Hisashi MATSUDA2Toshiba Energy Systems and Solutions Corporation, Energy Systems Research and Development CenterToshiba Corporation Research & Development Div., Power and Industrial Systems Research and Development CenterHokkaido University of ScienceIn order to realize deep laser welding, conceptual application of a supersonic jet as an aerodynamic window was investigated. Detailed characteristics of the supersonic jet as the aerodynamic window were studied experimentally. Flow field of the supersonic jet was examined based on the schlieren flow visualization technique. As compared to a free-vortex flow design applied to the aerodynamic window nozzle, in the case of supersonic jet, oblique shock waves were captured both at the nozzle exit edge and the shear layer on the aerodynamic window. The velocity field under the condition that the shock - expansion wave was formed in the aerodynamic window was measured by the PIV (Particle Image Velocimetry) system (Koncerto II, Seika Digital Image Corp.) . Both the vorticity magnitude and angular momentum were analyzed. Level of the vorticity magnitude in the core region of the supersonic jet was smaller by one-order than that in the shear layer in the region corresponding to the passage of laser-light (θ = 30 to 40° and r = 23.8 to 27.1 mm). The radial and circumferential velocity product in this region was similar to that observed under the free-vortex condition. In addition to the measurement mentioned above, pressure behavior was investigated using a multi-pressure measuring system (Scanivalve Corp. ZOC33). When the reservoir pressure was set at 800 kPa and diffuser width as 30.0mm, cavity pressure was reduced to 10.0 kPa. Under this reduced pressure environment, penetration depth increased by 2.6 times compared to penetration depth under atmospheric pressure environment. The effectiveness of the supersonic free-vortex aerodynamic window system tested in the high power laser welding manufacturing has been proven by the present study.https://www.jstage.jst.go.jp/article/transjsme/84/868/84_18-00280/_pdf/-char/ensupersonic flowaerodynamic windowschlierenflow visualizationpivhigh power laser welding |
| spellingShingle | Tatsuro UCHIDA Takeshi FUKUDA Hisashi MATSUDA Development of low vacuum laser welding technique using an aerodynamic window Nihon Kikai Gakkai ronbunshu supersonic flow aerodynamic window schlieren flow visualization piv high power laser welding |
| title | Development of low vacuum laser welding technique using an aerodynamic window |
| title_full | Development of low vacuum laser welding technique using an aerodynamic window |
| title_fullStr | Development of low vacuum laser welding technique using an aerodynamic window |
| title_full_unstemmed | Development of low vacuum laser welding technique using an aerodynamic window |
| title_short | Development of low vacuum laser welding technique using an aerodynamic window |
| title_sort | development of low vacuum laser welding technique using an aerodynamic window |
| topic | supersonic flow aerodynamic window schlieren flow visualization piv high power laser welding |
| url | https://www.jstage.jst.go.jp/article/transjsme/84/868/84_18-00280/_pdf/-char/en |
| work_keys_str_mv | AT tatsurouchida developmentoflowvacuumlaserweldingtechniqueusinganaerodynamicwindow AT takeshifukuda developmentoflowvacuumlaserweldingtechniqueusinganaerodynamicwindow AT hisashimatsuda developmentoflowvacuumlaserweldingtechniqueusinganaerodynamicwindow |