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Experimental determination of temperature threshold for melt surface deformation during laser interaction on iron at atmospheric pressure

Article dans une revue avec comité de lecture
Author
HIRANO, Koji
FABBRO, Rémy
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
MULLER, Maryse
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]

URI
http://hdl.handle.net/10985/7614
DOI
10.1088/0022-3727/44/43/435402
Date
2011
Journal
Journal of Physics D: Applied Physics

Abstract

Recoil pressure is the principal driving force of molten metal in laser processing in the intensity range of 10^-1 ~ 10^2 MW/cm2. It is thus essential to estimate the recoil pressure in order to describe physical processes or to carry out numerical simulations. However, there exists no quantitative estimation of the recoil pressure near the boiling temperature (Tv), which is particularly important in welding process. In this study we experimentally investigated the recoil pressure of pure iron around Tv. The main interest was to determine the threshold surface temperature to start deformation of melt surface. Using camera-based temperature measurement with accurate evaluation of emissivity from experiment, it was shown that the surface temperature has to reach Tv to initiate the melt surface deformation. This result provides the first experimental evidence for the frequently used assumption that a deep keyhole welding requires surface temperature over Tv. It is indicated also that, in normal gas-assisted laser cutting process, the recoil pressure hardly contributes to material ejection when the surface temperature is lower than Tv, as opposed to commonly believed presumption.

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