In recent years the high-power beam deflecting optics developed at IWS have proven to be successful in several areas of industrial manufacturing including precision welding in spatially limited geometries with high path speeds. High-power beam deflecting optics developed at the Fraunhofer Institute for Materials and Beam Technology (IWS) enable a highly dynamic motion of the laser beam on any workpiece contour. Due to the low mass of deflection mirrors moved by means of a galvanometer scanner this beam motion is possible at very high path speeds (up to 600 m min-1) of the beam spot at extremely high precision (accuracy better than 0.05 mm). The accelerations can be as high as several 100 m s-2. The beam deflecting optics are used with laser powers of up to 4 kW for the processing with CO2 lasers and up to 3 kW for Nd:YAG lasers of high beam quality (lasertronic® SAO1.06). The size of the processing field ( 50 x 50 mm2) depends on the used focal length (f 250 mm). Task specific programs for WinNT® are available for control of the galvanometer scanner and the lasers. Their user interface makes it possible to simply program any processing path geometry and path- or time related laser power adjustments for optimized processes. A powerful and modularly expandable PC-board with its own processor enables the calculation and timely synchronized output of the necessary control signals for the galvanometer scanner and the processing laser. The control board as a slave computer communicates with the CNC of the laser machine through digital interfaces. A motion synchronized coupling with a conventional handling system (gantry robot) is possible to expand the processing field of the beam deflecting optics. This combination unites the advantage of highly dynamic beam deflection optics with the large working area of a traditional handling system. Moreover it is possible to integrate sensor systems for position detection and process control. In recent years the high-power beam deflecting optics developed at IWS have proven to be successful in several areas of industrial manufacturing including precision welding in spatially limited geometries with high path speeds.
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