Dissimilarly Laser Welded High Entropy Alloy and Stainless Steel 304

Abstract

This research explores the dissimilar welding of High Entropy Alloy (HEA), specifically FeNiMnCr18, with conventional Stainless Steel (SS 304) using laser welding, without the use of filler metal. The study employs state-of-the-art techniques, including arc melting for alloy fabrication and laser beam welding (LBW) for joint formation. Experimental parameters, such as laser power, scanning speed, and beam focus, are optimized based on a comprehensive literature review. Noteworthy findings from prior studies on dissimilar alloy welding are incorporated to enhance weld quality. The investigation delves into the influence of shielding gases, focusing on nitrogen, on porosity mitigation during laser welding. Mechanical testing, microstructure characterization through optical and scanning electron microscopy, and Radiography testing contribute to a thorough evaluation of the welded joints. The research aims to advance the understanding of dissimilar welding involving HEAs and conventional alloys, offering valuable insights for applications in critical structural scenarios. The weld joint formed was defect-free and had an average hardness of 154.6 HV.