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Microstructure, mechanical properties and failure mechanisms of resistance spot welding joints between ultra high strength steel 22MnB5 and galvanized steel HSLA350

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Abstract

Resistance spot welding of 22MnB5/HSLA350 and its weldability are investigated. From base material to the nugget, the microstructure of 22MnB5 side can be expressed as M/tempered M+ granular carbides/F+M/fine M/lath M, and on HSLA350 side, F+M/F+flocculent P+tempered M/F+flocculent P+M/F+M/lath M are observed. The heat-affected zone (HAZ) of 22MnB5 exhibits obvious softening region and strengthening region caused by the tempered M and quite fine M, respectively. The peak load of welded joints undergoes two stages of a dramatic increase and a subsequent decrease with increases in the welding current. The maximum value (13.82 kN) of peak load is achieved at a welding current of 8 kA. The failure modes involving interfacial failure (IF), pullout failure from the galvanized steel (PFG), pullout failure from boron steel and tearing of the galvanized steel (PFB-TG) and pullout failure from the boron steel (PFB) are discussed in detail.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, No. 174, Shazhengjie Street, Shapingba District, Chongqing, 400045, China

    Xuebo Liang, Xinjian Yuan, Haodong Wang, Xiuyang Li & Ci Li

  2. Body Shop, Plant 2, Changan Ford Automobile Co., Ltd., No. 666, Jinshan Road, New Northern Zone, Chongqing, 401122, China

    Xueyu Pan

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  1. Xuebo Liang
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  2. Xinjian Yuan
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  3. Haodong Wang
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  4. Xiuyang Li
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  5. Ci Li
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  6. Xueyu Pan
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Correspondence to Xinjian Yuan.

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Liang, X., Yuan, X., Wang, H. et al. Microstructure, mechanical properties and failure mechanisms of resistance spot welding joints between ultra high strength steel 22MnB5 and galvanized steel HSLA350. Int. J. Precis. Eng. Manuf. 17, 1659–1664 (2016). https://doi.org/10.1007/s12541-016-0192-8

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  • DOI: https://doi.org/10.1007/s12541-016-0192-8

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