Abstract
Arc brazing of zinc-coated steel (EG, Electro-galvanized steel) using Cu-3 wt%Si filler metal was performed. The influence of arc current and brazing speed on the bonding properties of the joint, such as bead characteristics, arc penetration, joint hardness, and tensile shear strength were evaluated. The microstructural characteristics of the joint were examined by scanning electron microscopy (SEM) and the compositional information was revealed by energy dispersive spectroscopy (EDS). The throat thickness varies inversely with the brazing speed. The EG joint shows the formation of Fe2Si phases, which result in higher microhardness than the base metal. The tensile samples were fractured in base metal, while minor bead cracks developed in the samples brazed at 80 cm/min-80 A, 60 cm/min-70 A, 70 cm/min-70 A.
Highlights
The automotive industry always demands high reliability of its auto components to meet safety requirements
Our study reports a comprehensive study of arc brazing of advanced electro-galvanized steels steels its (EG), its characteristics, properties and optimization of arc current brazingand current for (EG), characteristics, properties and optimization of arc brazing speedand for speed optimum optimum joint reliability
4aspeed demonstrates the difference bead surface with an arc current of 50–60
Summary
The automotive industry always demands high reliability of its auto components to meet safety requirements. Zinc vaporization occurs from the Zn-coated steel (base metal) during arc welding processes because the melting temperature (460 ◦ C) and vaporization temperature (906 ◦ C) of Zn are lower than those of arc welding and arc brazing [16] In these welding processes, to control the heat input, cooling rate, and the joint gap is important to reduce zinc vaporization and defects [16,17,18]. Most of Metals 2019, 9, 1006; doi:10.3390/met9091006 www.mdpi.com/journal/metals
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