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Metals 2016, 6(5), 111; doi:10.3390/met6050111

Investigation of the Failure of Advanced High Strength Steels Heterogeneous Spot Welds

1
Laboratoire MATEIS, CNRS UMR5510, Université de Lyon, INSA-Lyon, Villeurbanne Cedex, Lyon F-69621, France
2
ArcelorMittal Global Research and Development Maizières, Maizières-lès-Metz Cedex, Metz F-57283, France
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 7 April 2016 / Revised: 26 April 2016 / Accepted: 3 May 2016 / Published: 13 May 2016
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Abstract

Nowadays, environmental regulation encourages carmakers to reduce the global vehicle weight. Steelmakers develop grades with high performance (Advanced High Strength Steels, AHSS) and fine steel sheet assemblies are used in car body structures, with an optimized thickness in each part. However, unusual fracture modes are sometimes observed during the mechanical tests of heterogeneous AHSS welds, made of dissimilar steel grades and sheet thicknesses. Weld fractures can occur with a strength lower than expected. This study aims at understanding these fracture mechanisms and focuses on two common steel grades joined by Resistance Spot Welding (RSW): DP600 (a dual phase steel) and Usibor®1500 (a martensitic steel). The parameters affecting the failure modes and load bearing capacity are investigated during two common types of tests: the Cross Tension and Tensile Shear tests. The positive effects of heterogeneous welding with respect to the corresponding homogeneous configurations are discussed, as well as the consequences of a so-called Dome failure occurring at the weld nugget boundary. View Full-Text
Keywords: resistance spot welding; Advanced High Strength Steels; failure mode; cross tension; tensile shear; dissimilar welding resistance spot welding; Advanced High Strength Steels; failure mode; cross tension; tensile shear; dissimilar welding
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Huin, T.; Dancette, S.; Fabrègue, D.; Dupuy, T. Investigation of the Failure of Advanced High Strength Steels Heterogeneous Spot Welds. Metals 2016, 6, 111.

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