Darkroom-free fluorescence penetration detection method for high-temperature heating surface tube bank clamping block of power station boiler

The invention relates to a darkroom-free fluorescence penetration detection method for a tube bank clamping block of a high-temperature heating surface of a power station boiler. The method comprisesthe steps that a V-shaped notch is formed between the outer wall of a pipeline and the end face of a clamping block to serve as a detection point; the pipeline at the detection point position is bent;and fluorescence penetration flaw detection is performed. The method overcomes the main defects that ray, ultrasonic and magnetic powder detection cannot be performed due to factors such as the space, the structure and the material of the clamping block, and cracks existing in the welding surface of the outer wall of the austenitic stainless steel pipe and the clamping block are found in the detection surface as deep as possible. 本发明涉及一种电站锅炉高温受热面管排夹持块无暗室荧光渗透检测方法。包括：在管道外壁与夹持块端面之间开一个V型缺口，作为检测点；使检测点位置的管道产生弯曲；进行荧光渗透探伤。该方法克服了夹持块空间、结构、材质等因素导致的无法射线、超声、磁粉检测，在尽可能深的检测面内发现奥氏体不锈钢管子外壁与夹持块焊接面存在的裂纹等主要缺陷。