B.V.R.Ravikumar, B.L.N.Krishna Sai, S.Rajashekhar
The 6xxx aluminium alloys have found application in automotive structures, as they offer an attractive combination of strength, formability and corrosion resistance, surface properties and good weldability. To make effective use of the automated systems it is essential that a high degree of confidence be achieved in predicting the weld parameters to attain the desired mechanical strength in welded joints. In this research, AA 6082 welds are made with gas tungsten arc welding (GTAW) using AA 4043 filler wire with non-pulsed current and pulsed current at different pulse frequencies like 2 pulses/sec, 4 pulses/sec and 6 pulses/sec using precision TIG 375 welding machine. This report to investigates the weld quality through non destructive testing (NDT) to study the porosity and surface cracks and also evaluation of the mechanical properties like ultimate tensile strength (UTS), 0.2% yield strength (YS) and % of elongation using GTAW with non-pulsed current and pulsed current at different pulse frequencies were studied and also to find the weld joint efficiency of the weldments. From this investigation the pulsed current TIG welding produces the better mechanical properties compared to the other welding processes
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