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Effects of Heat Input on Microstructure and Mechanical Properties of Laser-Welded Mg-Rare Earth Alloy

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Abstract

The effects of heat input on the quality of laser-welded Mg-rare earth alloy NZ30K were studied. Using a 15-kW high-power CO2 laser, the microstructure and mechanical properties of welded joints under different heat inputs had been analyzed and tested. It is found that the welding heat input plays an important role in laser welding of NZ30K. Good welded joint without macroscopic defects can be obtained using the proper heat input. With the increasing heat input, welding penetration gets deeper, the width of the heat-affected-zone becomes larger, and the distribution of precipitates changes concentration. Tensile tests display that the ultimate tensile strength (UTS) of the welded joint tends to increase at first with the increasing heat input. After the welded joint gets full penetration, the UTS remains almost the same, although the heat input is increased.

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Acknowledgments

This project is supported by the Key Project of National Natural Science Foundation of China (51035004). The authors also wish to thank Mr. F. H. Wang for providing the experimental materials. Special thanks are also due to Mr. K. Feng and Miss M. Li for their assistance in the experiments.

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Authors and Affiliations

  1. Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai, 200240, China

    Jun Dai, Jian Huang, Zhuguo Li & Yixiong Wu

  2. National Engineering Research Center of Light Alloys Net Forming, Shanghai Jiao Tong University, Shanghai, 200240, China

    Jie Dong

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  1. Jun Dai
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  2. Jian Huang
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  3. Zhuguo Li
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  4. Jie Dong
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  5. Yixiong Wu
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Correspondence to Jian Huang.

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Dai, J., Huang, J., Li, Z. et al. Effects of Heat Input on Microstructure and Mechanical Properties of Laser-Welded Mg-Rare Earth Alloy. J. of Materi Eng and Perform 22, 64–70 (2013). https://doi.org/10.1007/s11665-012-0173-8

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  • DOI: https://doi.org/10.1007/s11665-012-0173-8

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