Download full-text PDF

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

Article (PDF Available) inMetallurgical and Materials Transactions A 44(13) · November 2013with59 Reads
DOI: 10.1007/s11661-013-1953-y
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 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/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 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.
Full-text
Content uploaded by Javier Botana
Author content
JMEP_2014_23_5_1568-1575.pdf
2 B
Sorry, there is no online preview for this file type.
Project
The main objective of this project is to help achieving various social challenges, mainly in the field of sustainable transport and in particular, on two related aspects. First, to facilitate the u…" [more]
Project
LUI is a Project to lay the groundwork for the implementation of the Physical Internet. (LUI is the acronym in Spanish of the Universal Logistic Integrated - Logística Universal Integrada). RedEP…" [more]
Article
April 2012
    Laser beam welding (LBW) show clear advantages compared with other techniques, as the low heat input, the high localization ability, the high welding speed, the high flexibility, the high weld quality and the high production rate. However, its applicability to aluminum alloys is limited, as they generally have high reflectivity, high thermal conductivity and low viscosity. In the present... [Show full abstract]
    Article
    September 2009 · Applied Surface Science · Impact Factor: 2.71
      In this work, samples of aluminium alloys 5083-T0 and 6082-T6 have been welded under conduction regime, using a high power diode laser. The influence of experimental variables, as the laser power and the linear welding rate, on the sizes and properties of the butt weld beads has been studied. In addition to measure the depths and widths of the weld beads, their microstructure, microhardness... [Show full abstract]
      Article
      March 2014 · Journal of Materials Engineering and Performance · Impact Factor: 1.00
        In the present study, Ti6Al4V samples have been welded under conduction regime by means of a high power diode laser. The main objective of the work has been to determine the actual influence of the surface pre-treatments on the laser welding process. Thus, six different pre-treatments were applied to Ti6Al4V samples before performing bead-on-plate and butt welding treatments. The depth, width,... [Show full abstract]
        Article
        February 2012 · Materials Science Forum
          Laser beam welding (LBW) show clear advantages compared with other techniques, as the low heat input, the high localization ability, the high welding speed, the high flexibility, the high weld quality and the high production rate. However, its applicability to aluminium alloys is limited, as they generally have high reflectivity, high thermal conductivity and low viscosity. In the present... [Show full abstract]
          Article
          May 2012 · Welding Journal · Impact Factor: 1.38
            In the present work, a highpower diode laser has been employed to weld six aluminum alloys (1050, 2017, 2024, 5083, 6082, and 7075) under conduction regime. Controlling the experimental variables, butt joints with higher penetration than those previously reported in the literature for this regime could be obtained, demonstrating the weldability of all these alloys with the employed... [Show full abstract]
            Discover more