Abstract
The objective of this development is to promote the application of Advanced High Strength Steel grades for mass saving of chassis parts consisting in replacing current steel grades by thinner gauge ones having higher mechanical properties. In this context, the fatigue strength of Gaz Metal Arc Welds could become an issue. Therefore, solutions to improve the fatigue strength of welds were investigated on GMAW lap specimens. Then several demonstrators, representative of typical joint geometries, were proposed to validate post-treatments according to different modes of loading and provide realistic and demonstrative evaluations.Today, the improvement in fatigue resistance according to the type of post-treatment/reinforcement applied can be quantified as well as the cost of such solutions. Examples of weight saving are proposed and quoted based on steel chassis part solution.
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