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Numerical and Experimental Observation of the melt pool behaviour for laser beam welded thick plates in partial penetration mode

  • The geometry of the melt pool in laser beam welding plays a major role to understand the dynamics of the melt and its solidification behavior. In this study, a butt configuration of 20 mm thick structural steel and transparent quartz glass was used to observe the weld pool geometry in the partial penetration mode by means of a high-speed camera. The observations show that the dimensions of the weld pool vary depending on the depth. The areas close to the weld pool surface take a teardrop-shape. A bulge-region and its temporal evolution were observed approximately in the weld pool root. Additionally, a 3D transient thermal-fluid numerical simulation was performed to obtain the weld pool shape and to understand the formation mechanism of the observed bulging effect. The model considers the local temperature field, the effects of phase transition, thermo-capillary convection, natural convection and temperature-dependent material properties. The numerical results showed good accordance andThe geometry of the melt pool in laser beam welding plays a major role to understand the dynamics of the melt and its solidification behavior. In this study, a butt configuration of 20 mm thick structural steel and transparent quartz glass was used to observe the weld pool geometry in the partial penetration mode by means of a high-speed camera. The observations show that the dimensions of the weld pool vary depending on the depth. The areas close to the weld pool surface take a teardrop-shape. A bulge-region and its temporal evolution were observed approximately in the weld pool root. Additionally, a 3D transient thermal-fluid numerical simulation was performed to obtain the weld pool shape and to understand the formation mechanism of the observed bulging effect. The model considers the local temperature field, the effects of phase transition, thermo-capillary convection, natural convection and temperature-dependent material properties. The numerical results showed good accordance and were furthermore used to improve the understanding of the experimentally observed bulging effect.zeige mehrzeige weniger

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Metadaten
Autor*innen:Nasim BakirORCiD
Koautor*innen:Ömer Üstündag, Andrey Gumenyuk, Michael Rethmeier
Dokumenttyp:Posterpräsentation
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2019
Organisationseinheit der BAM:9 Komponentensicherheit
9 Komponentensicherheit / 9.3 Schweißtechnische Fertigungsverfahren
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Laser beam welding; Melt pool behaviour; Partial penetration
Themenfelder/Aktivitätsfelder der BAM:Material
Veranstaltung:5th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation
Veranstaltungsort:Osaka, Japan
Beginndatum der Veranstaltung:21.11.2019
Enddatum der Veranstaltung:22.11.2019
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:05.12.2019
Referierte Publikation:Nein
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