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Analysis of Nugget Formation During Resistance Spot Welding on Dissimilar Metal Sheets of Aluminum and Magnesium Alloys

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Abstract

The nugget formation of resistance spot welding (RSW) on dissimilar material sheets of aluminum and magnesium alloys was studied, and the element distribution, microstructure, and microhardness distribution near the joint interface were analyzed. It was found that the staggered high regions at the contact interface of aluminum and magnesium alloy sheets, where the dissimilar metal melted together, tended to be the preferred nucleation regions of nugget. The main technical problem of RSW on dissimilar metal sheets of aluminum and magnesium alloys was the brittle-hard Al12Mg17 intermetallic compounds distributed in the nugget, with hardness much higher than either side of the base materials. Microcracks tended to generate at the interface of the nugget and base materials, which affected weld quality and strength.

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Acknowledgments

This work was supported by Scientific and Technological Research Program of Chongqing Municipal Education Commission of China (Grant No. KJ1400930), the fund of the State Key Laboratory of Solidification Processing in NWPU (Grant No. SKLSP201204), and the Major Project of Outstanding Achievements Conversion of Chongqing Colleges (Grant No. KJZH11215).

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Authors and Affiliations

  1. School of Material Science and Engineering, Chongqing University of Technology, Chongqing, 400054, P.R. China

    Yi Luo (Professor)

  2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, P.R. China

    Yi Luo (Professor) & Jinglong Li (Professor)

Authors
  1. Yi Luo
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  2. Jinglong Li
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Correspondence to Yi Luo.

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Manuscript submitted April 5, 2013.

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Luo, Y., Li, J. Analysis of Nugget Formation During Resistance Spot Welding on Dissimilar Metal Sheets of Aluminum and Magnesium Alloys. Metall Mater Trans A 45, 5107–5113 (2014). https://doi.org/10.1007/s11661-014-2463-2

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  • DOI: https://doi.org/10.1007/s11661-014-2463-2

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