The GTAW process is used for welding the thinner sections of alloys. Alternating current is recommended for general-purpose work since it provides the half-cycle of cleaning action. AC welding, usually with high frequency, is widely used with manual and automatic applications. Procedures should be followed closely and special attention should be given to the type of tungsten electrode, size of welding nozzle, gas type and gas flow rates. The preferred electrodes are thoriated, ceriated or lanthanated tungsten as specified in AWS A5.12 . The advantage of these electrodes is that they have a more stable arc and can be used with higher currents that pure tungsten electrodes. Agree with comments above on gasses. The rod 4043 rod is very ductile but a little low on strenght, what alloy are you welding?