Distortion control in CO2 Laser Beam dissimilar welds of SS316L to INCONEL625 plates

Abstract

The paper attempts to join similar and dissimilar joints by employing CO2 laser beam welding. The SS316L and INCONEL625 plates of 5mm thick plates are used. The L4 orthogonal array was chosen for the experimentation. Three parameters are chosen in two levels, and four trials are optimized. Analysis of Variance (ANOVA) is used to optimize and determine the most critical parameters. The weldments have undergone visual, X-ray radiography, and macrostructure examination to verify the quality of the weldments verified with full penetration. Distortion in dissimilar weldments may be measured using a vernier height gauge. Simple inspection methods, No-way ANOVA, Linear Figures, and ANOVA were used, and two parameters were identified with 99% criticality. ANOVA shows 95% significance for distortion with welding speed at 51.9%, welding current at 13%, and shielding Flow rate at 12.3% contribution. The welding speed and laser power are significant, while shielding gas is not a critical parameter but essential for the quality of the joint.