Gas- Und Magnetofluiddynamische Maßnahmen Zur Beeinflussung Der Nahtqualität Beim Laserstrahlschweißen
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Das Laserstrahlschwei en zählt heute zu den modernsten Verfahren der Fügetechnik. Mit der Realisierung des ersten Laborlasers [I] fiel 1960 der Startschu zur Entwicklung der zum Schwei en benötigten Laserstrahlquellen. Seit damals wurden immer leistungsflihigere und zuverlässigere Strahlquellen entwickelt, so da heute fi1r den industriellen Einsatz Laser mit Strahlleistungen bis zu 40 kW (C0-Laser) verrugbar sind. Inzwischen werden per annum 2 weltweit etwa 8000 neue Lasersysteme fiir die Materialbearbeitung installiert [2]. Diese Nachfrage nach Laseranlagen und der Nutzen dieser Anlagen ist aber nicht nur das Verdienst der Entwicklung besserer Strahlquellen, sondern vor allem der seit den 70er Jahren parallel dazu entwickelten und verfeinerten Verfahren der Lasermaterialbearbeitung. Das La- serstrahlschwei en ist nur eine von vielen innovativen Einsatzmöglichkeiten des Strahlwerk- zeugs Laser. Trennen (Schneiden), Bohren, Beschichten, Abtragen und Härten etc. mit Laser- strahlung sind Fertigungsverfahren, die längst in der industriellen Serienproduktion fest eta- bliert sind [3]. Kennzeichnend fiir das Laserstrahlschwei en sind die damit zu erzielenden Einschwei tiefen bei gleichzeitig geringen Schwei nahtbreiten (Tiefe/Breite bis ca. 6: 1). Das Laserstrahl- schwei en steht damit in direkter Konkurrenz zum Elektronenstrahlschwei en, bei dem dieser "Tiefschwei effekt" schon 1958 entdeckt wurde und das angefangen von der Feinwerktech- nik bis hin zum Maschinenbau mit tonnenschweren Werkstücken Anwendung fmdet [4]. Es ist auch gerade das Elektronenstrahlschwei en, das zunehmend durch das Laserstrahlschweis- sen substituiert und zur Nischenanwendung verdrängt wird.
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