Optimization of activated tungsten inert gas welding of super duplex alloy 2507 based on experimental results

Abstract

In this work, the effect of activated tungsten inert gas welding process parameters on the depth of penetration of super duplex stainless steel alloy 2507 has been analyzed using response surface methodology. The design matrix for conducting the experiments was generated using the central composite rotatable design of response surface methodology of design of experiments. The input process parameters like current, torch speed and arc gap were varied at five levels. Based on the generated design matrix, bead-on-plate welds were made on 10-mm-hick super duplex stainless steel plate. The depth of penetration, which is the response in the present analysis, was measured on the samples. A second-order response surface model was developed. Then, response optimization was performed for obtaining the maximum depth of penetration using desirability approach. The validation of the model showed good agreement between the predicted and actual values of depth of penetration.

Optimization of A-TIG welding of duplex stainless steel alloy 2205 based on response surface methodology and experimental validation

“…Similarly, if the arc gap increases from 1 to 5 mm for constant torch speed (say 60 mm/min) the DOP also decreases. Similar results were obtained by Korra et al 17 during A-TIG welding of super duplex stainless steel alloy 2507.…”

“…A-TIG welding process input parameters which influence the weld bead geometry were identified from the literature. 16,17 cleaned with silicon carbide paper to remove dirt and cleaned with acetone prior to the experimental work. The multi-component specific activated flux developed at IGCAR, India was used in the present study.…”

“…The objective of ANOVA is to investigate whether the A-TIG welding process parameters and the interaction of process parameters have significant effects on the DOP and to recognize whether the model developed is significant. Korra et al 17 have performed a similar analysis for optimization of DOP for A-TIG welding of super duplex stainless steel alloy 2507. The ANOVA for DOP is shown in Table 4.…”

“…Juang and Tarng 16 have optimized the weld pool geometry of TIG welding of stainless steel using modified Taguchi method. Korra et al 17 have performed A-TIG welding response optimization using the desirability approach for obtaining the maximum DOP of super duplex stainless steel alloy 2507. Huang 18 studied the effect of activating flux and parameters of the weld bead profile of gas metal arc welding using Taguchi method.…”

Optimization of A-TIG welding process parameters for RAFM steel using response surface methodology

“…It also gives required information for design and process optimization and gives multiple responses. 17 Rajakumar et al 18 have optimized the process parameters of the friction stir welding process using RSM. Gunaraj and Murugan 19 have highlighted the use of RSM to develop mathematical models and plot contour graphs relating important input parameters to responses in submerged arc welding of pipes.…”