Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 21, Issue 7, Pages 555-563Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/13621718.2016.1141493
Keywords
Dual-phase steel; Electromagnetic stirring; Grain refinement; Microstructure; Resistance spot welding; Soft zone
Funding
- National Natural Science Foundation of China [51275300, 51322504, U1564204]
- Program for New Century Excellent Talents in University by Ministry of Education of China [NCET-12-0361]
- Program of Introducing Talents of Discipline to Universities [B06012]
- Research Project of State Key Laboratory of Mechanical System and Vibration [MSVZD201411]
- U. S. Department of Energy, Office of Vehicle Technologies, as part of the Lightweight Materials Program
- U. S. Department of Energy [DE-AC05-00OR2272]
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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. The soft zone of the magnetically assisted welds was wider than the conventional welds.
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