CAP1400核电站接管和安全端焊接接头性能

Properties of nozzle safe-end welded joints in CAP1400 nuclear power plant

研究CAP1400核电站接管和安全端焊接工艺性和接头力学性能。结果表明,焊接接头无损探伤和力学性能试验结果均满足设计要求。室温及350℃条件下,SA-508 Gr.3 Cl.2母材与690焊缝金属屈强比基本保持不变,但SA-182 F316LN屈强比下降较明显;焊接热循环导致焊接热影响区冲击韧性降低,在不同冲击试验温度下,SA-508 Gr.3 Cl.2吸收能量基本维持在230 J以上,但-21℃时母材热影响区吸收能量降低至150 J左右。

In this paper,mechanical properties and weldability were invested for the nozzle safe-end weld joint of CAP1400 nuclear power plants. It is showed that the NDT and mechanical properties test results meet the design requirements. At room temperature and 350 ℃ test conditions,yield ratio of SA-508Gr.3 C1.2 and 690 weld metal has little change,while yield ratio of SA-182 F316LN decreases obviously. The impact toughness of the SA-508Gr.3 C1.2 heat affected zone decreases significantly due to the welding heat input. The absorbed energy of SA-508 Gr.3 C1.2 base metal reraains at above 230 J at different impact test temperature,while the absorbed energy of heat affected zone reduces to about 150 J.