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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

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





Autor: Thibaut Huin 1,2, Sylvain Dancette 1,* , Damien Fabrègue 1 and Thomas Dupuy 2

Fuente: http://mdpi.com/



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