The 1st International Conference on High Manganese Steels May 15–18, 2011/Hilton Hotel Seoul, Korea.
Weldability Evaluation and Microstructure Analysis of Resistance-Spot-Welded High-Mn Steel in Automotive Application†
Article first published online: 15 FEB 2012
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
steel research international
Volume 83, Issue 4, pages 352–357, April 2012
How to Cite
Saha, D. C., Han, S., Chin, K. G., Choi, I. and Park, Y.-D. (2012), Weldability Evaluation and Microstructure Analysis of Resistance-Spot-Welded High-Mn Steel in Automotive Application. steel research int., 83: 352–357. doi: 10.1002/srin.201100324
- Issue published online: 4 APR 2012
- Article first published online: 15 FEB 2012
- Manuscript Received: 2 DEC 2011
- high manganese steels;
- resistance spot welding;
- welding defects
In this paper, resistance spot weldability of high-Mn steels were investigated in order to get high reliability in welded joints of automotive components. Microstructural characterizations, cross-tensile test (CTT), microhardness tests of spot welded parts were conducted. The effects of weld current on the microstructural characteristics, mechanical properties, and fracture modes were investigated using optical microscopy (OM) and scanning electron microscopy (SEM). The hardness in the weld nugget was observed to be lower than that in the base metal (BM). In CTT, the failure initiation was observed to occur at the boundary of the weld nugget. Also welding imperfections of welded parts were investigated. Liquation cracking in heat affected zone (HAZ), porosity, and shrinkage cavity were found most common welding defects in welded parts. Furthermore, the effects of welding imperfections on weld quality and failure criteria were identified and discussed.