Taguchi-GRA Optimization of Shielded Metal Arc Welding Parameters for High Strength Low Alloy Steel
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Keywords:
SMAW, Welding, Taguchi, Grey Relational Analysis, OptimizationAbstract
This research aims to enhance the quality of welding joints in industrial applications made from
High Strength Low Alloy (HSLA) steel, by optimizing the welding parameters for Shielded Metal Arc
Welding (SMAW). The quality of welds significantly impacts mechanical properties and is influenced by
factors such as welding current, welding speed, and electrode diameter. Suboptimal values of these
parameters can lead to defects, affecting mechanical characteristics adversely. In this study, we conducted
nine experiments using the Taguchi orthogonal array L9 design and applied Grey Relational Analysis
(GRA) for multi-response optimization. The optimized welding parameters, identified as 125 A current, 4
mm/s speed, and 4 mm electrode diameter, resulted in a notable 9% increase in Tensile Strength and a
3.20% improvement in hardness values, indicating significant enhancement in weld quality and joint
integrity.
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