However, only a few porosities were found in the repair-welds of the weld of low alloy steel. Small porosities were formed in the first and second layers of the repair-welds of low alloy steel (base metal). Cracks were not observed in the irradiated low alloy steel and its weld by temper-bead repair-welding. The mechanical tests of tensile, impact, side bend and hardness were carried out after the repair-welding. The repair-welding was carried out by TIG and YAG laser welding at a heat input from 0.06 to 0.86 MJ/m. The He concentration in the irradiated specimens was estimated to be up to 12.9 appm. A low alloy steel and its weld, and stainless steel clad and nickel (Ni)-based alloy clad were irradiated in a materials test reactor (LVR-15, Czech Republic) up to 1.4 x 10 24 n/m 2 (>1 MeV) at 290degC, which approximately corresponds to the maximum neutron fluence of 60-year-operation plants' vessels. Weldability in neutron-irradiated low alloy steel for reactor (pressure) vessel has been studied by temper-bead repair-welding of low-heat-input TIG and YAG laser welding. Nakata, Kiyotomo Ozawa, Masayoshi Kamo, Kazuhiko Temper-bead repair-welding of neutron-irradiated reactor (pressure) vessel by low-heat-input TIG and YAG laser welding It is stressed that the defect must first be identified using a nondestructive method and the stages must be defined of the welding repair of the pressure vessel. The welding methods are briefly described the half-bead method is most frequently used. Some of the special regulations are discussed to be observed in welding jobs.

Specific welding conditions are described in repair of the pressure vessels of nuclear reactors in operation and the effect is pointed out to of neutrons on changes in steel properties. International Nuclear Information System (INIS) Welding in repair of nuclear reactor pressure vessels

Abaqus welding interface crackle