Abstract
Quality strongly depends on good mechanical properties of any manufacturing material. Similarly, quality of Tungsten Inert Gas (TIG) welding of Duplex Stainless Steel (DSS) depends on good mechanical properties like percentage of elongation, ultimate tensile strength etc. Better Percentage of Elongation (PE) is produced using proper welding parameters and their values at the time of TIG welding. In this study, TIG welding has been done on ASTM/UNS 2205 duplex stainless steel materials. A new mathematical model is developed using non-linear regression analysis for the prediction of percentage of elongation. The variables used in the prediction models are selected welding parameters like welding current, gas flow rate and speed of welding. A residual plot for PE has been developed to validate the mathematical model. Calculation of percentage deviation for PE has been made. Comparison of measured and predicted PE value has been done by graphical representation. The relationship between percentage of elongation and the welding parameters has been illustrated graphically by surface plots and contour plots as well. Combined effects of any pair of input parameters on PE are represented graphically with the help of three-dimensional surface plots. According to this analysis, the models provide good PE with the data used in this study.
Highlights
Duplex Stainless Steel (DSS) is made by exceptional blend of double phase configuration of ferrite with austenite. 50% ferritic and 50% austenitic phase structure has generally been observed in grain configuration of DSS
Completing X-ray radiography investigation, tensile testing samples were created from the Tungsten Inert Gas (TIG) welding plates, by Electronica sprintcut-734 Wire Electrical Discharge Machining (WEDM)
Photographic view of tensile specimen preparation by WEDM is shown in figure 3(a) Photographic view of tensile test specimens as per ASTM E8 is shown in figure 3(b) and tensile sample after test is shown by figure 3(c)
Summary
Duplex Stainless Steel (DSS) is made by exceptional blend of double phase configuration of ferrite with austenite. 50% ferritic and 50% austenitic phase structure has generally been observed in grain configuration of DSS. Murugan et al, [1] prepared a mathematical model for five levels factorial technique Using this method, bead geometry of welding of 316L stainless steel into IS2062 structural steel had been investigated and illustrated in graphical form. Del Coz Diaz et al, [5] showed the important role of the material properties in the final deformed shape of two different stainless steels using finite element method including the birth and death technique They investigated that opposite angular deformation and longitudinal bending occur when these steels are welded with a similar TIG procedure. Tarng et al, [8] investigated on the optimal weld bead structure of TIG welded stainless steel to determine the process parameters by using modified Taguchi method. The models provide good PE with the data used in this study
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