This study investigates the influence of tungsten inert gas (TIG) welding
parameters on the dilution and hardness of AA5052 aluminum alloy. Employing
Taguchi’s L27 orthogonal array, the research systematically explores the effects
of current, voltage, and welding speed. Analysis of the experimental data
utilizes signal-to-noise ratio, analysis of variance (ANOVA), and regression
techniques. The study compares a traditional regression model with a fuzzy logic
approach for result validation, finding that the latter exhibits marginally
better predictive accuracy. Optimal welding parameters are identified as 150 A
current, 20 V voltage, and 45 mm/s welding speed, yielding a maximum dilution of
52.81% and hardness of 145.3 HV 0.5. Current emerges as the most significant
factor influencing both dilution and hardness. Microstructural examination,
hardness profiling, and tensile testing of specimens welded under optimized
conditions reveal a characteristic hardness distribution across the weld zones
and ductile fracture behavior.
