Accordingly there is provided an apparatus adaptable to GTAW process to alternate supply of shielding gases to the welding torch including optimization of gas pulsing frequency for improved weld quality. The apparatus comprises at least two hoses carrying two different shielding gases from two individual gas cylinders, the atleast two hoses being connected to respective input terminals provided in a gas supply alternator. A GTAW torch is connected to respective outlets provided in the gas supply alternator via two individual hoses. The shielding gas alternator is provided with at least two timer knobs including a timer circuit for controlling the duration of flow for each individual gas. At least two solenoid valve are arranged to alternate frequency range of gas supply. The pulses alternating shielding gas supply technology overcomes the limitations of mixed gas method. The technology of pulsed alternating supply of shielding gas has influence on every aspect of the GTA welding process. The pulsed alternate supply of shielding gas causes a dynamic action on the molten weld pool, which results in improved weld quality both in terms of fusion characteristics and bead appearance. The alternate supply of shielding gas according to the invention produces a pulsing effect somewhat similar to pulsed GTAW but better than that in dynamics. The alternate shielding gas supply methodology generates multiple impacts to GTAW weld pool resulting in much improved weld quality. The pulsing frequency is adjustable from 1 to 10 cycles/min. The welding parameters and the alternate shielding gas supply frequency for improved weld quality is also established.
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