Cast iron is a high-carbon iron-carbon alloy. Cast iron is difficult to weld because of the high carbon concentration. A good connection necessitates the application of specific strategies and processes. This study investigates the effect of current strength on the mechanical properties of tensile strength and impact toughness of cast iron welded joints. The main materials used are gray cast iron and CIN 3 filler. The welding process uses an AC TIG welding machine. The welding seam is made of a

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... single V with an angle of 70 o , and the electric current variations are 80A, 90A, and 100A, respectively. Tensile testing is carried out with a UTM machine referring to ASTM E8M, while the Charpy impact test refers to ASTM E23. From the study results, it was found that the higher the use of electric current resulted in the mechanical properties of the tensile strength and impact toughness of the weld being also higher, which occurred at 100A electric current, reaching 181.05 MPa and 0.22 J/mm 2 .