在承压设备的制造、检验过程中,往往会出现因法兰连接结构失效,导致介质泄露的现象。其原因是多样的,如垫片损坏、紧固件失效、法兰变形等等。而法兰变形一般在制造过程中形成,给设备的密封带来先天不足,对设备的正常使用造成不利影响。如某企业生产的压力容器在水压试验过程中,发现法兰不能密封,最终只能对一侧法兰进行重新加工,既浪费了成本又影响了工期。钢结构构件或节点在焊接过程中,局部区域受到很强的高温作用,在此不均匀的加热和冷却过程中产生了变形。法兰在焊接过程中也会不同程度的 In the pressure equipment manufacturing, testing process, often due to failure of the flange connection structure, leading to the phenomenon of media leakage. The reasons are varied, such as gasket damage, failure of fasteners, flange deformation and so on. The deformation of the flange is generally formed in the manufacturing process, to the equipment caused by the inherent sealing, the normal use of equipment adversely affected. Such as an enterprise pressure vessel in the hydrostatic test process and found that the flange can not be sealed, and ultimately only on one side of the flange re-processing, both a waste of costs and the impact of the construction period. During the welding process, the steel structure components or joints are subject to strong high temperature in the local area, and the non-uniform heating and cooling process is deformed. Flange in the welding process will be different levels