On September 19-22nd 2016  Lessmüller Lasertechnik presented its achievements in OCT-technology at LANE 2016 conference in Fürth, Germany. LANE 2016 is the 9th International Conference on Photonic Technologies for an international exchange of ideas, opinions, perspectives, results and solutions concerning photonic technologies in order to enhance the additive manufacturing, the precision processing with ultrashort laser pulses and the fast laser beam manipulation. Dr. Nataliya Deyneka Dupriez shared the successful test results of the OCT-applications for remote laser welding (published online: Industrial contributions LANE 2016) with a broad audience.

Optical Coherence Tomography for Remote Laser Welding

Abstract

Optical coherence tomography (OCT) is an innovative technology in modern industrial laser processing in particular in laser welding.  Performing  coaxially  to  the  processing  laser  and  supplied  with  the  OCT  scanner,  OCT  enables  not  only  the tomographical  keyhole  depth  measurements  but  also  precise  omnidirectional  seam  tracking.  By  acquiring  a  3D  surface topography, the profile of the joint can be recorded with high axial and lateral resolution. Thus the exact welding position can be detected in real-time regardless of the viewing angle, a change of the focusing distance or the welding direction. Frequency analysis of the measurement data makes OCT immune to the intensive process light. Performing with high acquisition rate and accompanied by high processing rate analysis software, OCT can provide “on the fly” tracking and is a promising technique for fast accurate and cost-effective remote laser welding.  Simple maintenance-free solution, robust and small-sized, OCT is easy adaptable to any conventional laser head, it does not require sophisticated alignment and any additional cross jet.

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