Global welding market is changing as eco-friendly, robotized, automated welding. The TIG welding process is an indispensable welding process in industries that require high-quality welds because of the availability of high-quality welds due to the absence of spatter and fumes and the low cost of equipment. TIG (Tungsten Inert Gas) welding is used industry-wide as it is able to secure outstanding welding quality on almost all materials. Additionally, the welding method helps maintain clean work environment without spatter, fume, and slag. Furthermore it shows excellent qualities in terms of health, safety, and environment or HSE compared with other welding processes. However, TIG welding has a problem of low welding productivity and has many limitations in application. In addition, TIG welding is a non-consumable electrode welding method, and the feed rate of the filler acts as an independent variable for the current. However, in the case of GMAW and FCAW, consumable electrode type welding methods, the filler metal feed rate acts as a dependent variable for the current. Therefore, TIG welding can freely adjust the filler metal feed rate and current. In order to improve the productivity in TIG welding, it is necessary to increase the supply amount of the filler and increase the welding current for melting the same. However, when a large current is used, a strong indentation due to the arc pressure generated by the plasma jet causes a severe indentation on the surface of the melting paper, which may cause welding defects. In order to overcome the limitation of this fundamental TIG welding, it is necessary to approach new parameters that can closely observe and identify the welding phenomena between the welding current of TIG welding and the fluxing speed of the consumable.
Therefore, in order to solve the problems in TIG welding for high productivity, it is necessary to verify the parameters of the shear drag ratio, which is a relation parameter between the welding current of the TIG welding and the feed rate of the consumable material.