The automotive industry is constantly under several challenges in many aspects, such as develop of new materials and improve their manufacturability. In order to achieve light weight, reduced emissions and ensure conductor safety, advanced high strength steels (AHSS) are able to fulfill these requirements. Transformation-induced plasticity and martensitic steels are well suited for light weighing car body constructions, even for advantage to reduce the safety problems. The second challenge is welding these materials, it is necessary invest sources on welding are-as for some conventional and advanced technologies. Gas tungsten arc welding-tungsten inert gas (GTAW-TIG) is focused in literature as an alternative choice for joining high strength low alloy steels; this study is held to compare the differences between gas metal arc welding-metal inert gas (GMAW-MIG) and GTAW welding processes. The aim of this study is to characterize microstructure of dis-similar TRIP and martensitic welded joints by GMAW and GTAW welding pro-cesses. Scanning electron was employed to obtain information about the speci-mens that provided evidence of ductile morphology; moreover lap shear tensile testing was performed following ASTM E08 standard.
Microstructural effects between AHSS dissimilar joints using MIG and TIG welding process
PADOVANI, Marco;MERLIN, Mattia;
2015
Abstract
The automotive industry is constantly under several challenges in many aspects, such as develop of new materials and improve their manufacturability. In order to achieve light weight, reduced emissions and ensure conductor safety, advanced high strength steels (AHSS) are able to fulfill these requirements. Transformation-induced plasticity and martensitic steels are well suited for light weighing car body constructions, even for advantage to reduce the safety problems. The second challenge is welding these materials, it is necessary invest sources on welding are-as for some conventional and advanced technologies. Gas tungsten arc welding-tungsten inert gas (GTAW-TIG) is focused in literature as an alternative choice for joining high strength low alloy steels; this study is held to compare the differences between gas metal arc welding-metal inert gas (GMAW-MIG) and GTAW welding processes. The aim of this study is to characterize microstructure of dis-similar TRIP and martensitic welded joints by GMAW and GTAW welding pro-cesses. Scanning electron was employed to obtain information about the speci-mens that provided evidence of ductile morphology; moreover lap shear tensile testing was performed following ASTM E08 standard.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
