Effect of Weld Schedule on the Residual Stress Distribution of Boron Steel Spot Welds

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

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Abstract

Press-hardened boron steel has been utilized in anti-intrusion systems in automobiles, providing high strength and weight-saving potential through gage reduction. Boron steel spot welds exhibit a soft heat-affected zone which is surrounded by a hard nugget and outlying base material. This soft zone reduces the strength of the weld and makes it susceptible to failure. Additionally, different welding regimes lead to significantly different hardness distributions, making failure prediction difficult. Boron steel sheets, welded with fixed and adaptive schedules, were characterized. These are the first experimentally determined residual stress distributions for boron steel resistance spot welds which have been reported. Residual strains were measured using neutron diffraction, and the hardness distributions were measured on the same welds. Additionally, similar measurements were performed on spot welded DP600 steel as a reference material. A correspondence between residual stress and hardness profiles was observed for all welds. A significant difference in material properties was observed between the fixed schedule and adaptively welded boron steel samples, which could potentially lead to a difference in failure loads between the two boron steel welds.

Original languageEnglish
Pages (from-to)(in press)
Number of pages15
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume(in press)
DOIs
Publication statusPublished - 27 Mar 2017

Fingerprint

spot welds
Boron
Steel
schedules
stress distribution
residual stress
Stress concentration
Residual stresses
Welds
boron
steels
Hardness
hardness
Heat affected zone
Steel sheet
Neutron diffraction
heat affected zone
automobiles
Automobiles
Gages

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

Effect of Weld Schedule on the Residual Stress Distribution of Boron Steel Spot Welds. / Raath, N. D.; Norman, D.; McGregor, I.; Dashwood, R.; Hughes, D. J.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. (in press), 27.03.2017, p. (in press).

Research output: Contribution to journalArticle

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