A route to fracture prediction of spot welded boron steel in automotive applications

N.D. Raath, D.J. Hughes, D. Norman, I. McGregor, R. Dashwood

Research output: Chapter in Book/Report/Conference proceedingConference proceedingpeer-review


This paper develops a methodology for predicting spot weld fractures in automotive boron steel grades, such that fracture modes can be predicted accurately in a vehicle or sub-assembly structure. To achieve this, it was necessary to understand the range of complex fracture modes observed in boron steel spot welds and how these are linked to the Heat Affected Zone (HAZ) microstructures and hardness distributions and residual stress. Material data for the HAZ was extracted by simulating the spot welding process using a Gleeble machine; achieving specific weld microstructure in a larger volume which was used in destructive testing. Neutron diffraction was employed to accurately characterize the post-weld residual stresses found inside the weld. The constitutive relations of specific areas in the HAZ where fracture is thought to occur is being incorporated into finite element software to improve fracture prediction of boron steel welds.
Original languageEnglish
Title of host publicationTMS Annual Meeting
Number of pages8
Publication statusPublished - 2013
EventCharacterization of Minerals, Metals, and Materials 2013: TMS 2013 Annual Meeting and Exhibition - San Antonio, United States
Duration: 3 Mar 20137 Mar 2013


ConferenceCharacterization of Minerals, Metals, and Materials 2013
Country/TerritoryUnited States
CitySan Antonio


  • Boron steel
  • Fracture
  • HAZ
  • Resistance spot weld
  • UHSS


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