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针对某电厂660MW超临界发电机组高温中压联合主汽阀与再热热段蒸汽管道过渡段对接焊缝在安装过程中发现的焊缝横向裂纹,从材料特性、焊接过程中的应力状态和环境因素方面分析了焊缝横向裂纹产生的原因,并制定了合理的返修工艺措施,取得了良好效果。
Aiming at the transverse cracks in the weld of 660MW supercritical generating unit high temperature and medium pressure combined main steam valve and the transitional section butt weld of the steam pipe in the reheat section, the characteristics of the weld, the stress state in the welding process and the environment Factor analysis of the causes of the weld horizontal cracks, and developed a reasonable rework process, and achieved good results.