The irradiation and recovery behavior of a nickel-chromium-molybdenum type weld metal with 0.27 weight percent copper was examined mainly with tension, impact, drop-weight, and fracture-mechanics specimens up to a thickness of 100 mm. After irradiation at about 6 × 10¹⁹ neutrons (n)/cm² (E > 1 MeV) at 310°C, the impact tests show larger temperature shift than for the drop-weight and fracture-mechanics tests. Recovery annealing was done at 350 (only hardness measurements), 400, 450, 500, and 550°C. Reasonable recovery effects were observed after annealing for 60 h at 450°C. For complete recovery, annealing between 500 and 550°C is necessary. Direct transfer of the test results to light water reactors is not possible, as the irradiation temperature of the specimens was 30 K higher than the operating temperature of reactor pressure vessels.