In the present era of competition, many organizations are very keen to control costs, maintain high productivity, meet various expectations of customers, and attain the best quality. The industrial application of tungsten inert gas welding is limited due to the lower depth of penetration. The limitation of the TIG welding process can be overcome by the new advancement in the process called the activated tungsten inert gas welding process (A-TIG). Researchers identified that the A-TIG process enhances the depth of penetration up to three times and increases the weld depth-to-width ratio which leads to an increase in productivity. It also helps to achieve better mechanical properties. The demand for A-TIG has risen over the past few years. In the activated TIG process, a layer of flux material is used over the surface of the material before welding. In the present work, an attempt has been made to review the activated flux welding process (A-TIG), its mechanism and theories and its future scope and industrial application, along with theories that give authentication to the effect of process parameters which led to increased penetration depth and hence productivity.