OK Tigrod 55 (formerly OK Tigrod 13.13) is a copper-coated, low alloyed, chromium-nickel-molybdenum (0,5% Cr, 0,5% Ni, 0,2% Mo) rod for GTAW of high-strength steels with a minimum tensile strength of 690 MPa. The rod is also suitable for welding steels where a good impact strength at low temperatures is required.