Product Code: ICAL06_905

The Role of Strong Focusability on the Welding Process
Authors:
Jan Weberpals, Institut für Strahlwerkzeuge; Stuttgart Germany
Friedrich Dausinger, Institut für Strahlwerkzeuge; Stuttgart Germany
Gunther Göbel, Institut für Werkstoff- und Strahltechnik; Dresden Germany
Berndt Brenner, Institut für Werkstoff- und Strahltechnik; Dresden Germany
Presented at ICALEO 2006

Thin disk lasers as well as fibre lasers are distinguished by their strong focusability and high efficiency. With the availability of such laser sources in a high power region, keyhole welding with very small focus diameters down to 50 µm became possible. Typical focus diameter regimes of such laser sources can now be compared in regard to their effect on welding depth and process efficiency. Based on results of thin disk laser experiments it has been shown in earlier publications that the influence of the divergence angle on the achievable welding depth increases dramatically for lower spot diameters. This effect stands in contrast to the behaviour at higher spot diameters, but was now confirmed by additional experiments with a fiber laser which made available smaller divergence values. No influence of focus diameter and divergence angle on the reachable cross sectional area for both laser systems has been observed, on the other hand. That means that in the investigated parameter range the process efficiency of keyhole welding is in fact independent of the focusability of the laser source.

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