SEM and XRD Characterisation of Fusion Lines Obtained on Austempered Ductile Iron by Laser Beam Welding without Preheating

Abstract

This study highlights the weldability of austempered ductile iron (ADI) using laser welding. SEM, EDS, and XRD analysis were performed on fusion lines, heat affected zone (HAZ), and melted zone (MZ). Welding speed (Ws) and laser power (P) were varied. The heat-affected zone is composed of graphite, perlite, and martensite; the melted and solidified zone contains graphite, ferrite, and cementite. XRD results are in accordance with SEM micrographs.