TITLE

Influence of CO2-Ar Mixtures as Shielding Gas on Laser Welding of Al-Mg Alloys

AUTHOR(S)
Boukha, Zouhair; Sánchez-Amaya, José María; González-Rovira, Leandro; Rio, Eloy Del; Blanco, Ginesa; Botana, Javier
PUB. DATE
December 2013
SOURCE
Metallurgical & Materials Transactions. Part A;Dec2013, Vol. 44 Issue 12, p5711
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this study, AA5083 samples were butt welded under a conduction regime with high-power diode laser (HPDL). Various mixtures composed of Ar and CO 2 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/microstructural 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 CO 2/Ar ratios was also estimated by means of electrochemical tests. The addition of CO 2 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 CO 2. The overall results indicate that the addition of small percentage of CO 2 to Ar leads to improvements of the mechanical and corrosion properties of the aluminum welds.
ACCESSION #
91988637

 

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