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Effect of Heat Input on Microstructure and Mechanical Properties of Joints Made by Bypass-Current MIG Welding–Brazing of Magnesium Alloy to Galvanized Steel

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Experiments were carried out with bypass-current MIG welding–brazing of magnesium alloy to galvanized steel to investigate the effect of heat input on the microstructure and mechanical properties of lap joints. Experimental results indicated that the joint efficiency tended to increase at first and then to reduce with the increase of heat input. The joint efficiency reached its maximum of about 70% when the heat input was 155 J/mm. The metallurgical bonding between magnesium alloy and steel was a thin continuous reaction layer, and the intermetallic compound layer consisted of Mg–Zn and slight Fe–Al phases. It is concluded that bypass-current MIG welding–brazing is a stable welding process, which can be used to achieve defect-free joining of magnesium alloy to steel with good weld appearances.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 51005049).

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Authors and Affiliations

  1. National Key Laboratory of Science and Technology on Underwater Vehicle, Harbin Engineering University, Harbin, 150001, China

    Yugang Miao, Bintao Wu, Xiangfang Xu & Duanfeng Han

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  1. Yugang Miao
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  2. Bintao Wu
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  3. Xiangfang Xu
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  4. Duanfeng Han
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Correspondence to Duanfeng Han.

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Available online at http://link.springer.com/journal/40195

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Miao, Y., Wu, B., Xu, X. et al. Effect of Heat Input on Microstructure and Mechanical Properties of Joints Made by Bypass-Current MIG Welding–Brazing of Magnesium Alloy to Galvanized Steel. Acta Metall. Sin. (Engl. Lett.) 27, 1038–1045 (2014). https://doi.org/10.1007/s40195-014-0118-3

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  • DOI: https://doi.org/10.1007/s40195-014-0118-3

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