OK Tigrod 13.26 is a copper-coated, low alloyed, nickel copper (0,8% Ni, 0,3 %Cu) rod for the GTAW of weathering steels such as COR-TEN, Patinax, Dillicor etc. The weld metal composition and mechanical properties also make this product suitable for welding high-strength steels with a minimum yield strength of less than 470 Mpa.