This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Ultimate Load Capacity of Spot Welds Made of Ultra High Strength Steels
Technical Paper
2011-01-0788
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Spot welds have two separation modes: interfacial and button pullout. Most of existing publications [8,9,10,11,12] focused on button pullout. This is because for the same sheet metal and gage combination, button pullout leads to higher separation load than interfacial separation. With the push for lighter vehicles, high strength and ultra high strength steels are used. To further reduce mass, welding flanges are getting narrower. The welding tips are getting smaller. The weld nugget diameters are smaller as a result. The separation mode for certain load cases is no longer nugget pullout, but interfacial instead. This lowers the weld's maximum load capacity. In order for CAE simulated prediction to correlate to physical behaviors of vehicle structures, it is important to define and reconfirm separation criteria. New tests and analyses are necessary. In this paper, an in-depth investigation is presented based on the recent GM tests on spot welds of hot stamped boron (HSB), martensitic (MS), dual phase (DP) and mild steels. The results and discussions of the separation modes give unique insight into spot weld behaviors of ultra high strength steels such as martensitic and boron steels. These results are compared to the results of lower grade steels.
Recommended Content
Authors
Topic
Citation
Zhang, Z., Chen, C., Zywicki, G., Blaski, B. et al., "Ultimate Load Capacity of Spot Welds Made of Ultra High Strength Steels," SAE Technical Paper 2011-01-0788, 2011, https://doi.org/10.4271/2011-01-0788.Also In
References
- Chao, Y. J. “Failure mode of spot welds: interfacial versus pullout” Science and Technology of Welding and Jointing 2003 8 2 133 137 http://www.me.sc.edu/fs/pdf/STWJ%20paper%20published.pdf
- Hongyan Zhang, S. Hu, Jack Senkara, Jacek “A Statistical Analysis of Expulsion Limits in Resistance Spot Welding” J. Manuf. Sci. Eng. August 2000 122 3 501 10
- “IISI Advanced High Strength Steel Application Guidelines - Version 3.0 Draft,” March 6 2006
- Peterson, Warren Accorsi, Ilaria Coon, Ted “Review of Weld Mechanical Property Specification Requirements in AWS D8.1 (Proposed)” Sheet Metal Welding Conference XII May 9 12 2006
- Feng, Zhili Simunovic, Srdjan Chao, Y. J. Kim, Y. “Impact Modeling and Characterization of Spot Welds (Phase I)” report to Auto/Steel Partnership September 2009
- Chao, Y. J. Kim, Y. Feng, Z. Simunovic, S. Wang, K. Kuo, M. “Dynamic Spot Weld Testing,” SAE Technical Paper 2009-01-0032 2009 10.4271/2009-01-0032
- MARYA, M. WANG, K HECTOR, L.G. GAYDEN, X. 2006 Tensile-Shear Forces and Fracture Modes in Single and Multiple Weld Specimens in Dual-Phase Steels Journal of Manufacturing Science and Engineering 2006 February 287 298
- Marya, M. Gayden, X. 2005 “Development of Requirements for Resistance Spot Welding of Dual-Phase Steels_DP600_-Part I: The Causes of Interfacial Fractures,” Weld J. 84 _11_ 172s 182s
- Marya, M. Gayden, X. 2005 “Development of Requirements for Resistance Spot Welding of Dual-Phase Steels_DP600_-Part II: Statistical Analyses,” Weld J. 84 12 197s 204s
- Pouranvari, M. Marashi, P. Goodarzi, M. Abedi, A. “AN ANALYTICAL MODEL PREDICTING FAILURE MODE OFRESISTANCE SPOT WELDS” proceedings of METAL May 13 15 2008 http://www.nanocon.cz/data/metal2008/sbornik/Lists/Papers/167.pdf
- Pouranvaril, M. Marashi, S. P. H. “Minimum fusion zone size required to ensure pullout failure mode of resistance spot welds during tensile-shear test” Kovove Mater 48 2010 197 202 http://www.elis.sk/download_file.php?product id=1966&session_id=9blv39lbmdotmnqfbte3mt4jr5
- Sun, Xin Stephens, Elizabeth V. Khaleel, Mohammad A. “Effects of fusion zone size and failure mode on peak load and energy absorption of advanced high strength steel spot welds under lap shear loading conditions” Engineering Failure Analysis 15 4 June 2008 356 367
- Girvin, B. Peterson, W. Gould, J. Development of appropriate spot welding practice for advanced high-strength steels American Iron and Steel Institute Pittsburgh 2004
- Biro, E. Lee, A. HAZ properties of various DP600 Chemistries Canadian Weld Associat J Spring 2005 17 21
- Vicker Hardness Profile of Hot Stamp Welds RoMan internal report to GM 2008