Clean lungs thanks to laser process exhaustion

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Mechanical engineering, shipbuilding, aviation – laser remote processing has been increasingly gaining ground in the industry for several years. Whereas in the past it was only possible to laser machine one part after the other, this process now allows parts up to one meter in size to be cut, welded, ablated or structured at different points virtually simultaneously. Nevertheless, although this works well, there is a problem: “The process operates with a high intensity of several kilowatts within a few seconds. This produces harmful emissions such as small particles and gases,” explains Annett Klotzbach from Fraunhofer IWS in Dresden. As part of the IGF research project “CleanRemote”, the Group Manager Bonding and Composite Technology has been working on the topic in recent years. Concrete results are now available.

Suction reduces health risks

With a particular suction device the risk for plant operators will be reduced. They are especially endangered when a production line is reloaded and therefore has to be opened. Particles can then escape and damage the operator’s lungs. The research was initiated by the question in which direction the small particles move, hardly visible to the naked eye. “This can be quite different because some particles are larger than others. The large ones generate more kinetic energy and therefore fly higher,” says Annett Klotzbach. In addition, the laser moves from one position to another within milliseconds by means of tilting mirrors, thereby complicating the calculations. “Our partners from the Chair of Inorganic Chemistry at TU Dresden have therefore developed a flow computer model to enable us to understand the particle trajectory. With this data, we finally optimize the suction devices,” says Annett Klotzbach. In addition to specifically arranged suction hoods, the scientists also installed a so-called transverse jet. “For particles located far from the suction hoods, it is necessary to use such a device. They are blown from one side to the other and then sucked out.” Residual soiling will also be removed by CO2 snow blasting, explains the scientist.

Meet occupational safety and environmental protection requirements

Annett Klotzbach and her team have worked for two and a half years on the project together with the cooperation partner. The results will now benefit those industries, in which laser remote processing is of particular importance, for example in those cases, in which the steel frame of a car seat is welded or a metallic surface has to be cleaned and roughened in order to bond carbon parts. “Laser remote processing with high-performance lasers will continue to find its way into the market, especially among small and medium-sized companies. You can benefit from our research results in order to meet the requirements of occupational health and safety and environmental protection law in the best possible way,” says Annett Klotzbach. In mid-June she will present the process to a specialist audience for the first time at the “LASER World of PHOTONICS” trade fair in Munich.

contact for scientific information:
Annett Klotzbach
Group Manager Bonding and Composite Technology
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS
annett.klotzbach@iws.fraunhofer.de
Phone +49 351 83391-3235
Winterbergstraße 28, 01277 Dresden
www.iws.fraunhofer.de

original publication:
https://www.iws.fraunhofer.de/en/pressandmedia/press_releases/2019/presseinformation_2019-09.html

idw 2019/06
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