Study on the Microstructure and Properties of Resistance Spot Welding Joint for Ultra Fine-Grained Steel

Abstract:

In this study, the effect of welding parameter on the microstructure and properties of resistance spot welding joint for 400MPa ultra fine-grained steel is investigated. The results indicated that the microstructure of HAZ of ultra fine-grained steel joint consists of hardening organization: bainite, martensite, M-A constituent, i.e. while the fusion zone mainly consists of the coarse martensite. By applied forge-delay force during resistance spot welding will increase the nugget diameter, eliminate the shrinkage defect in nugget zone and improve the shearing strength of joints.

• Periodical: Advanced Materials Research (Volumes 391-392)
• Pages: 540-544
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.391-392.540
• Online since: December 2011
• Authors: Cheng Gang Yang, Ji Jun Xin, Li Ming Ke, Li Peng Deng
• Keywords: Microstructure, Resistance Spot Welding (RSW), Ultra Fine-Grained Steel

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