Joint Interface Characteristics and Phase Transformations in Laser Brazed Steel

Zn-coated steel was laser brazed in a flare V-groove configuration, and the interfacial joining microstructure and solidification pathway were investigated for different wire feed rates (WFRs) with the assistance of thermodynamic calculations. Thermodynamic calculations indicate that Si atoms diffuse toward the steel substrate and this Si-enrichment layer along the steel/bead interface further promoted the formation of an α-Fe(Si) reaction …