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Publications


Laser beam absorption depending on the angle of incidence on ground surfaces

General Proceeding of WLT LASERS IN MANUFACTURING CONFERENCE (LIM 2019), Munich

Absorption of the laser beam energy on material surfaces depends on certain conditions, such as incident angle or
surface roughness. During laser processing complex parts with machined surfaces, e.g. crankshafts, laser beams strike
the surface under varied incident angles during the process. Therefore, an analysis of the laser energy absorption on
angled polished surfaces becomes necessary. Surface hardening was done on micro-alloyed steel plates with a surface
roughness of 0.5 µm. The angle of the laser beam relative to the plate surface was varied. The sizes of heat-affected
zones in the material surface were measured and compared, showing that the absorptivity at incident angles of 10º, 20º and 30º tends to be constant. However, changes of the incident angle affects the beam size and thus the value of power
density and line energy, which can affect the process results. Therefore, the angle or curvature of the structure must be
taken into consideration for process development since process parameters must be changed depending on the angle or
curvature of the specimens.


https://www.wlt.de/lim/Proceedings2019/data/PDF/Contribution_156_final.pdf