Abstract
Finite element analysis was carried out on the actual service process of dissimilar steel welded pipes of T91-TP347H, and numerical analysis was carried out on the internal and external surface of the joint and the weld interface on both sides from three aspects of maximum principal stress, equivalent stress and stress triaxiality. The results show that the steam side T91-weld area is weakened seriously, the holes are more nucleated, the stress is more concentrated, the holes are easy to expand, it belongs to the high stress triaxial area, the hole density is high, is a dangerous area. Stress relaxation occurs on T91 side with the increase of service time, so the reason for failure is not the increase of stress level in the stress concentration area, but the deterioration of material performance is caused by long service time.
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