Microstructures of magnetically assisted dual-phase steel resistance spot welds

Li, Y. B.; Li, D. L.; David, Stan A.; Lim, Yong Chae; Feng, Zhili

doi:10.1080/13621718.2016.1141493

Microstructures of magnetically assisted dual-phase steel resistance spot welds

Journal Article · Wed May 18 04:00:00 EDT 2016 · Science and Technology of Welding and Joining

DOI:https://doi.org/10.1080/13621718.2016.1141493· OSTI ID:1413630

Li, Y. B. ^[1]; Li, D. L. ^[1]; David, Stan A. ^[2]; ^[2]; ^[2]

Shanghai Jiao Tong Univ. (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Traditional spot welds and magnetically assisted spot welds were made in 2.25 mm thick galvanised dual-phase steel, and the weld microstructures were compared. The magnetically assisted weld nugget had a ‘dog bone’ shape, and it had an increased diameter, which indicates a larger load-bearing area that will improve mechanical performance. The fusion zone of the magnetically assisted welds had a finer and less-directional grain structure than the conventional welds, which would improve weld strength, plastic strains, and ductility. Both types of welds contained an unusual soft zone very close to the fusion zone that is thought to be an integral part of the fusion zone. Furthermore, the soft zone of the magnetically assisted welds was wider than the conventional welds.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1413630

Journal Information:: Science and Technology of Welding and Joining, Journal Name: Science and Technology of Welding and Joining Journal Issue: 7 Vol. 21; ISSN 1362-1718

Publisher:: Taylor & Francis

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Dual-phase steel
Electromagnetic stirring
Grain refinement
Microstructure
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Soft zone

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