Hot work tool steels have been used for manufacturing aluminum casting die components for the rim industry. These steels are specially designed for high temperature conditions. Characteristics of tool steel can be adjusted by appropriate heat treatment. The purpose of this investigation is to observe the most suitable welding wire for H13 steel base metal for stronger mold components which produce the rim. AISI H13 base metal sheet specimens were prepared with thicknesses of 4 mm. They were welded using three different chemical filler wires of 2.4 mm diameter in butt joint configuration by Gas Tungsten Arc Welding. In order to figure out the most suitable filler wire the same welding parameters were fixed for the whole investigation. Also, shielding gas was used as %75 Helium and 25 Argon with the flow rate of 11 lt/min. Heat input was calculated as 0.142 kJ/mm. Crom and Nickel equivalents were calculated for each filler material and estimations were made using Schaeffler Diagram. Mechanical tests were conducted; macro and microstructures were examined after ecthing. Weld bead widths were measured for all filler wires according to macrographs. Results of the study were reported with considering CNC machining operation times, the casting performance and the sustainability.