High precision materials processing using a novel Q-switched CO2 laser |
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| Institution: | 1. State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha, Hunan 410082, China;2. Hunan Provincial Key Laboratory of Intelligent Laser Manufacturing, Hunan University, Changsha, Hunan, 410082, China;1. Photonics Research Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Corrosion and Coating Laboratory, Department of Physics, University of Malaya, 50603 Kuala Lumpur, Malaysia;3. Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia |
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| Abstract: | Holes with diameters of about 400 µm have been laser trepanned in Ti6Al4V and carbon fibre reinforced polymer (CFRP) thin sheets with a thickness of 0.5 mm. A commercial CO2 laser (SM1500E, FEHA LaserTec, Germany) and a novel Q-switched CO2 laser (µ-storm, IAI, Netherlands) were used as radiation sources. Optical microscopy, scanning electron microscopy and replicas of the processed holes were used to investigate the influence of the CO2 laser pulse parameters (e.g. pulse energy, duration and peak power) on the processing quality. It was shown that melt formation and high temperature oxidation reactions of Ti6Al4V during thermal laser processing were reduced significantly by using short and high intense Q-switched CO2 laser pulses. During trepanning of CFRP heat affected zones resulting from the extremely different thermal properties (melting and vaporisation temperature, heat conduction) of the reinforcing carbon fibres and the polymer matrix were reduced significantly by using the Q-switched CO2 laser. The results demonstrate that Ti6Al4V and CFRP can be processed very precisely with CO2 laser radiation and air as processing gas without melt formation and thermal damage. |
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| Keywords: | CFRP |
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