Effect of combining Cr2O3 nano-particles and welding input parameters on the heat affected zone width in submerged arc welding process (original) (raw)
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Journal of Mechanical Science and Technology
Submerged arc welding (SAW) is a high-quality arc welding process used in heavy industries for welding thick plates. In this process, selecting appropriate values for the input parameters is required for high productivity and cost effectiveness. A very important weld qual-ity characteristic affected by welding input parameters is the hardness of melted zone (HMZ). This paper reports the applicability of fuzzy logic (FL) to predict HMZ in the SAW process which is affected by the combined effect of TiO 2 nano-particles and welding input parameters. The arc voltage, welding current, welding speed, contact tip-to-plate distance, and TiO 2 nano-particles were used as input parameters and HMZ as the response to develop FL model. A five-level five-factor central composite rotatable design (CCRD) was used in the experiments to generate experimental data. Experiments were performed, and HMZs were measured. The predicted results from FL were compared with the experimental data. The correlatio...
2012
Purpose: Submerged Arc Welding (SAW) is a common arc welding process where the total welding cost includes the cost of the flux consumed during welding, SAW is preferable more its inherent qualities like easy control of process variables, high quality, deep penetration, smooth finish. Flux used in submerged arc welding contributes a major part towards welding cost. In SAW, selecting appropriate values for process variables is essential in order to control HeatAffected Zone (HAZ) dimensions and get the required bead size and quality. Also, conditions must be selected that will ensure a predictable and reproducible weld bead, which is critical for obtaining high quality. In this investigation, mathematical models were developed to study the effects of process variables and heat input on various metallurgical aspects, namely, the widths of the HAZ, weld interface, and grain growth and grain refinement regions of the HAZ In the present work, the effect of operating voltage, welding curr...
Effect of Minor Additives on Bead Geometry and Shape Relationship Using Submerged Arc Welding Fluxes
Journal for Manufacturing Science and Production, 2015
Submerged arc welding (SAW) is extensively used because of its ability of metal refinement, deep penetration and protection from atmospheric contamination. In this study 20 base fluxes having CaO–SiO2–Al2O3 were prepared by agglomeration technique and CaF2, FeMn and NiO were added to study their effects on bead geometry (weld width, reinforcement and penetration) and shape relationship parameters (weld penetration shape factor and weld reinforcement form factor). The bead on plate welds was made on 18 mm thick MS plates using submerged arc welding. Welding parameters voltage, current and travel speed were kept constant. Design expert 8.0.7.1 has been used to develop mathematical models and ANOVA was used to check the accuracy and significance of the developed models. In this study the elements transferred to the welds during submerged arc welding have been correlated with the bead geometry.
OPTIMISATION OF OUTPUT PARAMETER OF SUBMERGED ARC WELDING BY RESPONSE SURFACE METHODOLOGY
Submerged arc welding is a widely used welding technology which relies on the selection of the optimum combination of input variables for achieving the required qualities of weld. Response surface methodology (RSM) was applied to develop a model for predicting the responses: Penetration (P), Bead Width (W) and Reinforcement (H). The four input variable i.e arc voltage (V), arc current (A), travel speed (S) and electrode extension (N) were selected for assessing the desired quality and process optimization. The main and interaction effects of these input variables on important bead geometry parameters were determined and their influence is reported.