Optical Microscopy Characterisation of Fusion Lines Obtained On Austempered Ductile Iron by Laser Beam Welding Without Preheating

Abstract

This study concerned the weldability of austempered ductile iron using laser welding. Was explored the operational window power - welding speed making the fusion lines on plates without preheating using as criteria the absence of the welding defects and the geometry of the fusion lines. The laser welds were characterized by optical microscopy on fusion lines, heat-affected zone, and melted zone. The results show the applicability of this laser beam welding technology to reduce and even eliminate the cracking phenomenon.