26 June 2017 Tomographical process monitoring of laser transmission welding with OCT
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Abstract
Process control of laser processes still encounters many obstacles. Although these processes are stable, a narrow process parameter window during the process or process deviations have led to an increase on the requirements for the process itself and on monitoring devices.

Laser transmission welding as a contactless and locally limited joining technique is well-established in a variety of demanding production areas. For example, sensitive parts demand a particle-free joining technique which does not affect the inner components.

Inline integrated non-destructive optical measurement systems capable of providing non-invasive tomographical images of the transparent material, the weld seam and its surrounding areas with micron resolution would improve the overall process. Obtained measurement data enable qualitative feedback into the system to adapt parameters for a more robust process.

Within this paper we present the inline monitoring device based on Fourier-domain optical coherence tomography developed within the European-funded research project “Manunet Weldable”. This device, after adaptation to the laser transmission welding process is optically and mechanically integrated into the existing laser system. The main target lies within the inline process control destined to extract tomographical geometrical measurement data from the weld seam forming process. Usage of this technology makes offline destructive testing of produced parts obsolete. 1,2,3,4
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Philippe Ackermann, Philippe Ackermann, Robert Schmitt, Robert Schmitt, } "Tomographical process monitoring of laser transmission welding with OCT", Proc. SPIE 10329, Optical Measurement Systems for Industrial Inspection X, 103290H (26 June 2017); doi: 10.1117/12.2269108; https://doi.org/10.1117/12.2269108
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