Operational Parameters Optimization of FCAW Welding Process for Hardfacing Applications

Abstract:

This work assessed the influence of welding parameters over weld beads geometry, deposited by FCAW process, aiming for hardfacing applications. SAE 1020 steel plates were used as substrate and 1.6 mm FeCrC+Nb alloy wire as filler metal. The input parameters were voltage (U), wire feed speed (WFS) and travel speed (TS), maintaining the remaining parameters constant a central composite design (CCD) was used in three levels. The statistical model optimization was performed through Response Surface Methodology (RSM) and multiple response optimization methodology (desirability). The results revealed a statistically significant mathematical model and predictive for Reinforcement/Width (R/W) response. For Reinforcement Area/Penetration Area (Ra/Pa) response, the model was characterized as statistically significant, non-predictive, requiring better fit. The wire feed speed was the most significant variable for R/W and Ra/Pa responses, while voltage was the less significant.

Key-words:
DOE; Surface response methodology; Desirability; FeCrC+Nb wire