Analysis and possible estimation of keyhole depths evolution, using laser operating parameters and material properties
Article dans une revue avec comité de lecture
The authors propose an analysis of the effect of various operating parameters on the keyhole depth during laser welding. The authors have developed a model that uses the analysis of the thermal field obtained in 2D geometry, which is mainly defined by the characteristic Peclet number. This allows us to show that the dependence of the aspect ratio R of the keyhole with the operating parameters of the process is a function of two parameters: a normalized aspect ratio R0, controlled by the incident laser power and the spot diameter, and a characteristic speed V0 related to the process of heat diffusion. The resulting general law R = f (R0, V/V0) appears to be very well verified by different experimental data and allows to define mean thermophysical parameters of the used materials. These data can then be used for keyhole depths prediction for any subsequent operating parameters of the same material. This model also allows us to define precisely a criterion for a keyhole threshold generation. The authors will apply the derived procedure to successfully analyze experiments on materials with very different thermophysical properties (such as steel alloys and copper), with various focal spots, incident laser powers, and welding speeds.
Files in this item
Showing items related by title, author, creator and subject.
Analysis of laser–melt pool–powder bed interaction during the selective laser melting of a stainless steel Article dans une revue avec comité de lectureGUNENTHIRAM, Valérie; PEYRE, Patrice; SCHNEIDER, Matthieu; DAL, Morgan; COSTE, Frédéric; FABBRO, Rémy (Laser Institute of America, 2017)The laser powder bed fusion (LPBF) or powder-bed additive layer manufacturing process is now recognized as a high-potential manufacturing process for complex metallic parts. However, many technical issues are still to ...
Experimental analysis of spatter generation and melt-pool behavior during the powder bed laser beam melting process Article dans une revue sans comité de lectureGUNENTHIRAM, V; PEYRE, P; SCHNEIDER, MATTHIEU; DAL, Morgan; COSTE, Frédéric; KOUTIRI, Imade; FABBRO, Rémy (Elsevier, 2018)The experimental analysis of spatter formation was carried out on an instrumented SLM set-up allowing the quantification of spatter ejections and possible correlation with melt-pool behavior. Considering nearly similar SLM ...
Laser based method for surface tension and density measurements for liquid refractory metals (Nb, Ta, and W) Article dans une revue avec comité de lectureDAL, Morgan; COSTE, Frédéric; SCHNEIDER, Matthieu; BOLIS, Riccardo; FABBRO, Rémy (Laser Institute of America, 2019)The increase of process simulations in industry leads to the need of accurate knowledge of material thermal properties. As the determination of liquid metal properties is quite difficult, this article presents an experimental ...
Laser-induced plume investigated by finite element modelling and scaling of particle entrainment in laser powder bed fusion Article dans une revue avec comité de lectureMAYI, Yaasin; DAL, Morgan; PEYRE, Patrice; BELLET, Michel; METTON, Charlotte; MORICONI, Clara; FABBRO, Remy (IOP Publishing, 2019)Although metal vaporisation has been observed in several laser processes such as drilling or welding, vapour plume expansion and its induced side effects are not fully understood. Especially, this phenomenon is garnering ...
Transient dynamics and stability of keyhole at threshold in laser powder bed fusion regime investigated by finite element modeling Article dans une revue avec comité de lectureMAYI, Yaasin A.; DAL, Morgan; PEYRE, Patrice; BELLET, Michel; METTON, Charlotte; MORICONI, Clara; FABBRO, Remy (Laser Institute of America, 2021)A Finite element model is developed with a commercial code to investigate the keyhole dynamics and stability at keyhole threshold, a fusion regime characteristic to laser microwelding or to Laser Powder Bed Fusion. The ...