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LASYS: LASERS IN ACTION Te introduction of aluminium in combination


with short flanges dramatically decreases the weight of car bodies, but welding guidance is more challenging. Hot cracks are just one noticeable drawback. Until now, this issue was addressed by using shielding gas and filler wire with silicon content in a tactile welding process, which is slow. By combining the seam tracking capabilities of


the Precitec WeldMaster with the ScanTracker scanning module and the implemented laser power control, novel processing strategies can be realised. Te ScanTracker is capable of laterally displacing the focused laser beam, but also superimposing lateral beam oscillations at high frequencies. Te optimised strategy results in a controlled seam geometry with respect to width and depth. Te WeldMaster Scan&Track solution, a module to modulate the laser power synchronously, is particularly important in the process. Te talk will present a solution for measuring


seam geometry using the coaxial WeldMaster camera in combination with laser triangulation. www.precitec.de


11.30-12.00


Increasing laser processing efficiency using multibeam and tailored beam profiles


Ulrich Rädel, Topag Lasertechnik


Beam shaping optics help to optimise results in laser material processing. By using diffractive beam splitters, multibeam arrays can be generated, leading to higher process speed and therefore lower cost. Process speed can also be increased with tailored beam profiles – for example top hat profiles, because pulse-to-pulse overlap can be reduced. Furthermore, tailored beam profiles increase the quality of ablation. Rädel will show typical optical setups for beam


shapers and beam splitters, and their integration in existing optical setups. He will also present scribing results of different applications using nano-, pico- and femtosecond lasers. www.topag.de


12.00-12.30


3D laser processing with Optotune’s tunable lens technology


David Stadler, Optotune Switzerland


Optotune developed the tunable lens module EL-10-42-OF, enabling 3D laser processing without any mechanically moving parts.


30 LASER SYSTEMS EUROPE ISSUE 31 • SUMMER 2016


Consequently, the change of focus is very fast, in the range of several milliseconds. Using laser light for material processing has become standard practice and is now spread widely throughout industry. Fixed glass optics in combination with movable galvo mirrors allow lasers to scan the entire working plane. Tis is restricted to one specific working distance (2D), whereas in general objects are three-dimensional. In recent years, laser processing applications have sought to overcome this limitation and access the third dimension (z-axis), typically by using mechanically moving z-stages. In a complementary approach, Optotune offers a solution based on the company’s well-established tunable lens technology, specifically optimised for laser processing applications. www.optotune.com


12.30-13.00


Flexible picosecond lasers and applications


Dr Maik Frede, Neolase


Laser material processing applications require highly flexible, comprehensive laser systems. Neolase has developed a picosecond master oscillator power amplifier (MOPA) platform, NeoMos, whereby the pulse parameters can be varied. Neolase combines innovative pulsed laser sources with well- established and reliable solid state amplifiers. Starting with 500ps pulse duration, the microchip- based MOPA enables a cost efficient solution for laser micromachining. Te flexible pulse technology, based on a laser diode with about a 70ps pulse duration, means the repetition rate and pulse energy can be changed. High precision is enabled by mode-locked based MOPA systems with 2ps pulse durations. www.neolase.com


13.00-13.30


Diode lasers – a modern tool for welding processes; advantages and applications


Michael Nagel, Laserline


While cutting is a major laser application, laser welding is gathering new applications day-by-day. Te current diode laser technology supports ongoing process developments and improves existing welding applications. Tis is driven by low investment and cost of ownership, but now process results show incredible improvements concerning


spatter, homogeneous welds and adaptive in-situ process control. In many applications diode laser technology is


thought of as the legitimate successor of CO2 lasers. Some application results will be shown to demonstrate the above, along with a general update on the current range of welding applications. www.laserline.de


13.30-14.00


Precision manufacturing of ultrahard materials using short and ultrashort laser pulses


Dr Claus Dold, Ewag


Te company Ewag belongs to United Grinding, which is itself part of the Koerber group. Ewag specialises in grinding and laser processing solutions in a wide variety of materials. Te Laser Line series of machines use five highly accurate CNC axes and three high speed optical axes in a compact machining centre. Te system is designed for processing ultrahard materials, as well as carbide and ceramic materials. Ewag’s main application field is the generation of cutting tools and other three dimensional geometries. www.ewag.com


14.00-15.00


VDMA: Future challenges for the photonics industry in Germany and Europe


Speakers: Gerhard Hein, VDMA, Laser and Laser Systems for Material Processing, Forum Photonics


Jürgen Valentin, chief technology officer, NanoFocus


Dr Thomas Rettich, head of research coordination, Trumpf


Daniela Bartscher-Herold, partner, Euro Asia Consulting PartG


@lasersystemsmag | www.lasersystemseurope.com


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