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重油催化装置再生器器壁焊缝附近多处出现贯穿性裂纹 ,其成因为应力腐蚀开裂。通过振动时效处理以降低焊缝残余应力 ,可避免应力腐蚀开裂的产生。因容器质大体高 ,采用 4点振动 ,加大主振力 ,减小附振力 ,延长振动时间的处理工艺。测试表明 ,新焊缝无论在垂直方向还是在平行方向的残余应力均降低了 50 %以上。大型工件采用振动时效处理降低焊缝残余应力效果显著 ,并可大大缩短检修工期。一年多以来设备运行正常。
Throughout the crack appeared in the vicinity of the wall welds of heavy oil catalytic device regenerator, the reason is stress corrosion cracking. Through the vibration aging treatment to reduce the weld residual stress, can avoid the stress corrosion cracking. Due to the container generally high quality, the use of 4-point vibration, increase the main vibration, reduce the vibration, prolong the processing time vibration. Tests show that the residual stress of the new weld, both in the vertical direction and in the parallel direction, is reduced by more than 50%. Vibration aging treatment of large parts to reduce the weld residual stress significant effect, and can greatly shorten the maintenance period. The equipment is operating normally for more than a year.