Quality assessment of the vitreous enamel coating applied to the weld joint

Abstract

This work compares different thicknesses of vitreous enamel coating applied to welded joints. Low-carbon steel Kosmalt E300T was used as a base material. The MAG welding method was used for all samples. Metallography was performed to compare the thickness of the coating formed on the machined and unmachined surfaces of the weld. SEM analysis focused on the substrate/vitreous enamel coating interface. The results show that the high thickness of the vitreous enamel coating that occurs in unmachined weld joints significantly decreases the properties of the enamel coating. In comparison, the machining of the weld surface contributes to the quality improvement of the vitreous enamel coating.