Abstract
During resistance spot welding, the welding current is the most important process parameter, which determines the welding heat input and then has a great influence on the welding quality. In present study, the CR590T/340YDP galvanized dual phase steel widely used as automobile material was carried out using resistance spot welding. The effect of welding current on the weld formation, microstructure, and mechanical properties was studied in detail. It was found that the quality of weld appearance decreased with the increase of welding current, and there was a Zn island on the weld surface. The microstructure of the whole resistance spot welded joint was inhomogeneity. The nugget zone consisted of coarse lath martensite and a little of ferrite with the columnar crystal morphology, and the microstructure of weld nugget became coarser when the welding current was higher. There was an optimum welding current value and the tensile strength reached the maximum. This investigation will provide the process guidance for automobile body production.
Highlights
In the automotive field, reducing the body weight is one of the most fundamental ways to save energy and reduce pollution
Galvanized dual phase steel has the advantages of low yield ratio, good formability, high tensile strength, good matching of strength and plasticity, corrosion resistance, and so on, which has been used in automobile body manufacturing [4,5,6]
Provide the process with guidance for automobile body production, Toexplore explorethethe weldability, and provide the process with guidance for automobile body the galvanized dual phase steel sheets employed for the automobile front longitudinal production, the CR590/340Y galvanized dual phase steel sheets employed for the automobile front beam part were carried out by resistance spot welding, and the influence ofinfluence the welding current on longitudinal beam part were carried out by resistance spot welding, and the of the welding weld formation, microstructure, microhardness, and tensile strength was studied in detail
Summary
In the automotive field, reducing the body weight is one of the most fundamental ways to save energy and reduce pollution. Materials 2018, 11, 2310 studied the microstructure, softening zone characteristics, mechanical behavior, and welding spatter defect of resistance spot welding of dual phase steels [19,20,21,22,23]. Provide the process with guidance for automobile body production, Toexplore explorethethe weldability, and provide the process with guidance for automobile body the CR590/340Y galvanized dual phase steel sheets employed for the automobile front longitudinal production, the CR590/340Y galvanized dual phase steel sheets employed for the automobile front beam part were carried out by resistance spot welding, and the influence ofinfluence the welding current on longitudinal beam part were carried out by resistance spot welding, and the of the welding weld formation, microstructure, microhardness, and tensile strength was studied in detail. Current on weld formation, microstructure, microhardness, and tensile strength was studied in detail
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