Laser processing

Laser processing has been involved in a large number of industrial applications, e.g., in automotive, aerospace, electronics, and medical sectors. Even though laser processes have been extensively studied, the mechanisms responsible for process deviation and defects formation, e.g., porosity, have not been successfully established. In this field, our mission is threefold:

  • First, get a fundamental understanding of laser-material interaction.
  • Second, develop/enhance laser processing on any materials.
  • Finally, develop new in situ and real-time monitoring and control systems for the laser industry.

 

Selected projects

  • Laser processing of hard and transparent materials

  • Laser polishing of tool steel

  • Laser processing using a wobbling head

 

Selected publications

  • Mouhamadali F., Equis S., Saeidi F., Best J.P., Cantoni M., Hoffmann P., and Wasmer K., “Nanosecond Pulsed Laser-Processing of CVD Diamond” Optics and Lasers in Engineering, Vol. 126, Issue March 2020, paper ID: 105917, 2020,
    https://doi.org/10.1016/j.optlaseng.2019.105917

  • Meylan B., Calderon I., Le-Quang T., and Wasmer K., "Investigations of Surface Defects during Laser Polishing of Tool Steel " Procedia CIRP, Vol. 94, Issue 2020, pp: 942–946, 2020,
    https://doi.org/10.1016/j.procir.2020.09.092

  • Le-Quang T., Vakili-Farahani F., Faivre N., and Wasmer K., "Energy-Efficient Laser Welding With Beam Oscillating Technique – A Parametric Study" Journal of Cleaner Production, Vol. XX, Issue: X, Paper ID: XX, pp: 1-XX, 2021,
    https://doi.org/10.1016/j.jclepro.2021.127796

  • Le-Quang T., Shevchik S.A., Meylan B., Vakili-Farahani F., Olbinado M.P., Rack A., and Wasmer K., “Why Is In Situ Quality Control of Laser Keyhole Welding a Real Challenge?” Procedia CIRP, Vol. 74, Issue 2018, pp: 649–653, 2018,
    https://doi.org/10.1016/j.procir.2018.08.055

  • Vakili-Farahani F., Lungershausen J., and Wasmer K., "Wavelet Analysis of Light Emission Signals in Laser Beam Welding", Journal of Laser Applications, Vol. 29, Issue 022424, pp: 1-7, 2017,
    http://dx.doi.org/10.2351/1.4983507

  • Vakili-Farahani F., Lungershausen J., and Wasmer K., “Process Parameter Optimization for Wobbling Laser Spot Welding of Ti6Al4V Alloy“, Physics Procedia, Vol. 83, pp: 483-493, 2016,
    http://dx.doi.org/10.1016/j.phpro.2016.08.050