核电站复合钢管道维修焊缝的断裂性能研究

Study on Fracture Behavior of Repair Weld of Composite Steel Pipe in Nuclear Power Plant

为验证不同体系焊材(美标和俄标)对典型核电站复合钢管道维修焊缝的断裂性能的影响,采用成熟的焊接工艺、不同体系焊材制备复合钢管道维修试样,并分别对其熔敷区和热影响区进行断裂性能测试。结果表明,美标焊材修复焊缝的熔敷区的抗断裂性能明显高于俄标焊材;两种体系焊材修复焊缝的热影响区的抗断裂性能相近;俄标焊材修复焊缝的热影响区的抗断裂性能明显高于熔敷区;从趋势上判别,随着裂纹扩展量的增大,美标焊材修复焊缝的热影响区的J阻力曲线明显高于熔敷区,美标焊材修复焊缝的熔敷区和热影响区的条件起裂韧度相差不大。

In order to verify the influence of different system welding materials(American standard and Russian standard)on the fracture performance of repair welds of composite steel pipe in typical nuclear power plants,mature welding processes and different system welding materials were used to prepare composite steel pipe maintenance samples,and the fracture performance of the deposited zone and heat affected zone were tested respectively.The results show that the fracture resistance of the deposited zone of the repair weld with American standard welding materials is significantly higher than that of Russian standard welding materials;The fracture resistance of the heat affected zone of the weld repaired by the two systems are similar;The fracture resistance of the heat affected zone of the repair weld with Russian standard welding materials is significantly higher than that of the deposited zone;Judging from the trend,with the increase of crack growth,the J resistance curve of heat affected zone of American standard welding material repair weld is significantly higher than that of deposited zone,and there is little difference in the conditional crack initiation toughness between the deposited zone and heat affected zone of American standard welding material repair weld is not different.