Study of the influence of focal position on back-reflected radiation during deep penetration laser welding and its simulation

0522282 - ÚPT 2020 RIV US eng C - Conference Paper (international conference)
Horník, Petr - Šarbort, Martin - Šebestová, Hana - Mrňa, Libor
Study of the influence of focal position on back-reflected radiation during deep penetration laser welding and its simulation.
Optics and Measurement International Conference 2019. Proceedings of SPIE. Vol. 11385. Bellingham: SPIE, 2019, č. článku 1138505. ISBN 9781510635470. ISSN 0277-786X. E-ISSN 1996-756X.
[Optics and Measurement International Conference 2019. Liberec (CZ), 08.10.2019-10.10.2019]
R&D Projects: GA TA ČR TG03010046; GA TA ČR(CZ) TH04010366
Institutional support: RVO:68081731
Keywords : laser welding * back-reflection * optical process monitoring * ray tracing simulation
OECD category: Optics (including laser optics and quantum optics)
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11385.toc#FrontMatterVolume11385

penetration laser welding mode characterized by formation of keyhole is often used. A small portion of the laser beam is reflected back from the keyhole and returned to the laser through the optical system of the welding head and optical fiber. The reflected radiation is monitored in the laser for the safety of the optical resonator and its signal can be read and used for process monitoring. The experiment was conducted to relate the intensity of the back-reflected radiation with depth and width of the weld for the variable focal position. The experiments were performed for two variants of the optical focusing system and materials with different thermo-physical properties - carbon steel and stainless steel. Furthermore, a mathematical model for back-reflected radiation was created using ray tracing. The shape of the keyhole was approximated as an inclined conical cavity. The results of the simulation were compared with experimentally measured data and it was found that the proposed model is most suitable for the description of stainless steel.
Permanent Link: http://hdl.handle.net/11104/0306878