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Parameter Optimization of Gas Tungsten-Arc Repair Welding Technique in Mg–6Gd–3Y–0.5Zr Alloy

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Abstract

The feasibility of gas tungsten-arc repair welding was studied in Mg–6Gd–3Y–0.5Zr alloy. The processing parameters were optimized by sequential experiments including comparative study to find proper filler material and the type of welding groove by butt welding, and the investigation of influence of preliminary heating, area of repair welding, post-weld heat treatment and thickness of welding plate on the mechanical properties of welded joints. In addition, the analysis of microstructure and tensile properties of Mg–6Gd–3Y–0.5Zr alloy was performed for comparison with welded joints. The results showed that the microstructure in as-cast condition was characterized by equiaxial α-Mg and eutectic phase, including Mg24(Gd,Y)5 and Mg5(Gd,Y) phase. The strength was improved greatly after T6 treatment, while the ductility was remarkably decreased. The filler material and the type of welding groove were chosen as Mg–6Gd–3Y–0.5Zr alloy and V-type, respectively. The optimal process parameters of repair welding consisted of preliminary heating, T6 treatment after welding, 4 mm-thickness plates and welding area with the diameter of Φ15 mm. The tensile strength of welded joints reached the maximum value up to 295 MPa, equivalent to 99.7% of base material.

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Acknowledgements

This work was funded by the National Science and Technology Major Project of China through Project No. 2017ZX04014001, the National Key Research and Development Program of China through Project No. 2016YFB0301104, the National Natural Science Foundation of China (NSFC) through Projects Nos. 51301173, 51531002, 51601193 and 51701218, and the National Basic Research Program of China (973 Program) through Project No. 2013CB632202.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Tsinghua University, Beijing, China

    D. H. Meng & P. J. Li

  2. The Group of Magnesium Alloys and Their Applications, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China

    B. Zhou, D. Wu, Y. Q. Ma & R. S. Chen

  3. School of Materials Science and Engineering, University of Science and Technology of China, Hefei, China

    B. Zhou

  4. Beijing Institute of Astronautical Systems Engineering, Beijing, China

    D. H. Meng

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  1. D. H. Meng
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  2. B. Zhou
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  4. Y. Q. Ma
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  5. R. S. Chen
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  6. P. J. Li
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Correspondence to D. Wu or R. S. Chen.

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Meng, D.H., Zhou, B., Wu, D. et al. Parameter Optimization of Gas Tungsten-Arc Repair Welding Technique in Mg–6Gd–3Y–0.5Zr Alloy. Inter Metalcast 13, 345–353 (2019). https://doi.org/10.1007/s40962-018-0257-9

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  • DOI: https://doi.org/10.1007/s40962-018-0257-9

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