【摘要】 针对300 MW机组P91材质主蒸汽管道对接焊缝上发现的表面裂纹缺陷,通过无损探伤以及硬度、金相检测,结合机组冷态和热态主蒸汽管道支吊架检验结果,分析导致焊缝表面裂纹发生的影响因素,阐述处理方法。提出通过加强管道焊接热处理质量监督和控制,重视管道支吊架检查和调整等措施,可以降低焊缝表面裂纹的发生。更多还原

【Abstract】 Surface crack was found on weld joints on P91 main steam pipe of 300 MW units.Through non-destructive testing,hardness and metallurgic test and in combination with examination of supports and hangers of main steam pipes in cold state and hot state,the paper analyzes the factors which influenced surface crack on weld joints and expounds the solution.By improvement of quality monitoring and control on heat treatment of pipe welding and examination and adjustment of pipe supports and hangers,the occurrence of surface crack on weld joints could be reduced.更多还原