Etude des mouvements de convection dans un bain fondu d’un matériau soudé avec un laser CO2
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Date
2004
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Publisher
University of M'sila
Abstract
During the welding of materials with a CO2 laser, the matter in the molten pool is subjected to
movements of mixing, or movements of convection. These movements result from the
combination of several strengths: strengths of surface tension, viscosity strengths, and gravity
strengths.
In preceding works the researchers obtained micrographies of weld pool carried out with a CO2
lasers, on various materials (aluminium, steels, stainless steels, titanium). In the work of Taibi
Amar, micrographies of some weldings show well the stream lines of these movements.
This work relates to the theoretical study of the movements of convection in a weld pool, the
explanation of the phenomenon with the detail of the implied forces, the mathematical
formulation, i.e. the writing of the equations which control these movements, the solution of
these equations by using a software of resolution by finite elements, Flexpde, and finally
comparison with the experimental results.
This study as any theoretical study pushes towards more results and conclusions, and thus we
can deduce the conditions from them to have a privileged direction of rotation of these
movements, their effects on the form of the welding, deep or wide, and on the presence of
additional components.