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

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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.

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Acknowledgments

The current work has been financially supported by the Ministerio de Educación y Ciencia (project DELATIAL, Ref. MAT2008-06882-C04-02) and by the Junta de Andalucía (project SOLDATIA, Ref. TEP 6180).

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Authors and Affiliations

  1. LABCYP, Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, CASEM, Universidad de Cádiz, Campus Río San Pedro, 11510, Puerto Real, Cádiz, Spain

    Zouhair Boukha (Researcher), José María Sánchez-Amaya (Researcher), Leandro González-Rovira (Researcher) & Javier Botana (Professor)

  2. Titania, Ensayos y Proyectos Industriales S.L. Parque Tecnológico TecnoBahía Edif. RETSE, Nave 4. Ctra. Sanlúcar Km 7, 11510, El Puerto de Santa María, Cádiz, Spain

    José María Sánchez-Amaya (Researcher) & Leandro González-Rovira (Researcher)

  3. IMEYMAT, Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, Campus Río San Pedro, 11510, Puerto Real, Cádiz, Spain

    Eloy Del Rio (Researcher) & Ginesa Blanco (Professor)

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  1. Zouhair Boukha
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  2. José María Sánchez-Amaya
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Correspondence to José María Sánchez-Amaya.

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Manuscript submitted February 14, 2013.

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Boukha, Z., Sánchez-Amaya, J.M., González-Rovira, L. et al. Influence of CO2-Ar Mixtures as Shielding Gas on Laser Welding of Al-Mg Alloys. Metall Mater Trans A 44, 5711–5723 (2013). https://doi.org/10.1007/s11661-013-1953-y

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