6533b825fe1ef96bd1282863
RESEARCH PRODUCT
Determination of an empirical law of aluminium and magnesium alloys absorption coefficient during Nd :YAG laser interaction
Jean-marie JouvardPierre SallamandNicolas PierronEugen CicalaSimone Matteïsubject
010302 applied physicsAcoustics and UltrasonicsChemistry[ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]chemistry.chemical_element02 engineering and technologyWeldingMolar absorptivity021001 nanoscience & nanotechnologyCondensed Matter PhysicsLaser01 natural sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic Materialslaw.inventionIntegrating spherelawAluminiumAttenuation coefficientNd:YAG laser0103 physical sciences[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]0210 nano-technologyBeam (structure)description
International audience; Welding laser modelling requires knowledge about relative changes of many thermo-physical parameters involved in the interaction. The absorptivity of the material is one of the most important. In this study, experimental measurements of absorptivity with an integrating sphere on two alloys (aluminium and magnesium) were made. These results were compared with an analytical calculation that takes into account the trapping of the beam by multiple reflections inside the keyhole. Based on a statistical method, an empirical law is proposed connecting absorptivity with the peak power of the laser and the duration of interaction. During the interaction, two distinct phenomenologies are brought to light. A threshold is then defined after which the physical process becomes stable. Below this threshold, the measurement of absorptivity is problematic, and the values are widely dispersed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-03-16 |