Optimization of pulsed GTAW process parameters to obtain maximum tensile strength in AA7075-T6 Aluminium alloy

Abstract

The mathematical model is developed to predict pulsed gas tungsten arc welded (GTAW) joints of AA 7075-T6 aluminium alloy. The mathematical model is developed by incorporating the process parameters like peak current, base current, welding speed, and pulse on time. All the experiments were conducted on the basis of four factors, four levels Composite Design Matrix. In this study an attempt is made to develop mathematical model by preplacing the filler wire in to the weld groove. The optimized GTAW process parameters illustrate that improvement in the tensile properties of welded joints. A mathematical model were developed at 95% confidence level and tested for adequacy. The developed model can be used in industry for predicting tensile strength of AA 7075-T6 aluminium alloy joints. The results shows that welding speed greatest influence on tensile strength subsequently with peak current, pulse on time, and base current when filler wire placed in to the weld groove before starting the welding.