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FaBri-QS
Basic research with novel components for high brightness fiber laser – subcontract sensors and process monitoring
In welding with solid state laser sources a fiber optical waveguide is used to transport the beam to the work station where the beam is focused on the work piece by a welding head. The high beam quality of state of the art diode pumped solid state lasers allows concentrating the high output power in a small focus diameter. This adds to the advantage of laser beam welding, the locally concentrated energy input which enables precise processing.
From the system technology point of view, high beam quality leads to new challenging requirements on the welding head: The high energy density in the laser beam path heats up the beam guiding and forming optics. The temperature rise influences the optical properties and thus the position of the focal plane in reference to the work piece. This affects the spot diameter on the work piece and thus the beam intensity for the welding process. In this project an integral welding head which actively compensates this shift of the focal plane was developed. The figure shows an image of the welding head with closed loop focus position control and additional modules for process monitoring and coaxial seam tracking.
Funding by BMBF (13N9096) of the work subcontracted by Jenoptik Automatisierungstechnik GmbH is gratefully acknowledged.
Sponsor
BMBF (13N9096)
Timeframe
2008/05/01 – 2010/02/28
Department Manager
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