RT journal article
T1 Influence of CO2-Ar Mixtures as Shielding Gas on Laser Welding of Al-Mg Alloys
A1 Boukha, Z.
A1 Sánchez Amaya, José María
A1 González Rovira, Leandro
A1 del Rio, E.
A1 Blanco Montilla, Ginesa
A1 Botana Pedemonte, Francisco Javier
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
AB In this study, AA5083 samples were butt welded under a conduction regime with high-power diode laser (HPDL). Various mixtures composed of Ar and CO2 were used as a shielding gas. The influence of the shielding gas composition on the microstructure and on the properties of laser welds was analyzed. The weld beads were deeply characterized by metallographic/micro- structural studies, X-ray diffraction (XRD), X-ray energy dispersive spectrometry (X-EDS) chemical analyses, X-ray photoelectron spectra (XPS), microhardness, and tensile strength. The corrosion resistance of laser-remelted surfaces with different CO2/Ar ratios was also estimated by means of electrochemical tests. The addition of CO2 to the shielding gas results in a better weld penetration and oxidizes the weld pool surface. This addition also promotes the migration of Mg toward the surface of weld beads and induces the formation of magnesium aluminates spinel on the welds. The best corrosion resistance result is achieved with 20 pct CO2. The overall results indicate that the addition of small percentage of CO2 to Ar leads to improvements of the mechanical and corrosion properties of the aluminum welds.
PB Springer
SN 1073-5623
YR 2013
FD 2013
LK http://hdl.handle.net/10498/30406
UL http://hdl.handle.net/10498/30406
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 21-sep-2026