DEVELOPMENT OF MATHEMATICAL MODEL ON GAS TUNGSTEN ARC WELDING PROCESS PARAMETERS.

Abstract

GAS TUNGSTEN ARC WELDING (GTAW) is the quality weld process. It is preferred welding process for stainless steel, low alloy steel, nickel, cobalt, titanium, aluminum, copper, and magnesium. The present work aims to evaluate the effect of Gas Tungsten Arc Welding process parameters on the quality of the weld bead. The process parameters Welding Current, Wire Diameter, Wire Feed Speed, Ratio of wire feed rate to travel speed and Plate thickness are taken as a input variables for this present work. The quality of the weld bead can be assessed by the bead characteristics such as Penetration, Reinforcement & Width. Experiments were conducted to study the effects of the welding process parameters. Statistically designed experiments with 5 process parameters (each at 3 levels) are conducted to study the effect of these parameters on bead geometry. It is found from the analysis of variance (ANOVA) that the wire feed rate, travel speed and wire diameter are the main parameters that influence bead geometry in GTAW. Mathematical models are developed for depth of penetration, reinforcement height and bead width for GTAW using the multiple regression analysis. Index Terms: GTAW, DataFit version 9.0.59, I, D, WFR, TS, PT.