Deep Drilling of Structural Timber with High Power Ultrashort Pulsed Laser RadiationWednesday (24.06.2020) 15:50 - 16:10 Room 2
We report on a wood deep drilling process applying ultrashort pulsed laser radiation. The target application is the predrilling of screw connections of spruce structural timber up to 400 mm thickness. Main advantage of laser drilling compared with conventional deep drilling is that the boreholes are not displaced by inhomogeneities such as knotholes, cracks and fiber direction within the timber. The misguidance of conventional drills or self-tapping screws itself is an actual challenge in structural engineering which could be overcome by laser drilling. The influence of the laser drilling on the strength of such bolted connections was analysed by pull out tests. The quality of the achieved boreholes is compared to a similar process using a quasi-cw fiber laser. Furthermore, the basic ablation behaviour of wood has been investigated. The results show non-carbonized wood ablation which depends on the texture of the wood.
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