Shielding Gas Coaxial Jet Pipes Numerical Study of a Vertical Laser Welding Process of AZ91 Magnesium Alloy

The laser welding of magnesium alloys, largely used in many fabrication applications, has gained considerable interest especially in aerospace, electronics, automotive industry etc. Unfortunately, this process is associated to an undesired phenomenon which is “oxidation”. For this reason, a good shi...

Full description

Saved in:
Bibliographic Details
Published in:Journal of Applied Fluid Mechanics 2018-01, Vol.11 (1), p.79-94
Main Authors: Boughanmi, C., Bannour, S., Mhiri, H., Bournot, P.
Format: Article
Language:English
Subjects:
Aerodynamics
Aerospace industry
Argon
Automobile industry
Avionics
Coaxial nozzles
Computational fluid dynamics
Computer applications
Design optimization
Fabrication
Fluid dynamics
Fluid flow
Gas jets
Hydrodynamics
Inclination angle
Laser beam welding
Laser welding
Shielding gas
Coaxial impinging jet
Numerical study
Volume fraction
Lasers
Magnesium
Magnesium base alloys
Oxidation
Shielding
Turbulence models
Vertical orientation
Welding
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The laser welding of magnesium alloys, largely used in many fabrication applications, has gained considerable interest especially in aerospace, electronics, automotive industry etc. Unfortunately, this process is associated to an undesired phenomenon which is “oxidation”. For this reason, a good shielding system of the welding zone is of major importance. This paper presents a numerical study using computational fluid dynamics (CFD) of a laser welding process employing a moving volumetric heat source. Starting with the turbulence model validity, a parametric study of this welding process in a vertical position aiming to optimize the design of protection gas device, the gas jet inclination, the appropriate welding direction and the gas type is, then, proposed. The optimum parametric combination ensuring the largest gas coverage area is the one where the shielding gas is Argon, supplied by the coaxial nozzles at a downward inclination angle with respect to the laser beam axis, and a downward welding direction.
ISSN:1735-3572
1735-3645
DOI:10.29252/jafm.11.01.27831