Ultrasonic imaging detection method for blade fir-type root of turbine

Abstract

The invention discloses an ultrasonic imaging detection method for a blade fir-type root of a turbine. The method comprises the following steps: (A) connecting a phased array detector with a phased array transducer; (B) coating the blade fir-type root with a coupling agent; (C) directly arranging the phased array transducer on a steam inlet side shoulder and a steam outlet side shoulder of the blade fir-type root and in an area, close to the blade fir-type root, of a blade body to perform sector scanning; (D) storing a formed image through the phased array detector, and interpreting defect information; (E) fixing the phased array transducer on a wedge block, and arranging the phased array transducer at a joint of the outer arc surface of the blade body and the blade root to perform sector scanning on the middle area of the inner arc of the blade root; (F) storing the formed image through the phased array detector, and interpreting the defect information; and (G) performing quality evaluation on the detected blade fir-type root, and keeping a record. According to the method, the blade fir-type root of a complicated geometrical shape can be subjected to comprehensive, accurate, quick and intuitive imaging inspection, so that the problems of small detection range and large detection failure area of an existing detection method are solved.

Description

technical field [0001] The invention relates to an ultrasonic imaging detection method, in particular to an ultrasonic imaging detection method for the fir-tree root of a steam turbine blade. Background technique [0002] At present, as an important supervised metal part, the rotor blade of a steam turbine not only bears huge alternating stress and torque, but also bears the impact of high-temperature and high-speed gas. The fir tree root of the blade is the part connecting the blade and the rim. In order to ensure that the blades can be firmly fixed on the impeller under any operating conditions, the fir tree-shaped roots of the blades are buried inside the impeller. If there are defects in the fir tree-shaped root of the blade and cannot be found in time, the blade will fly off during the rotation process, causing serious production accidents. Therefore, preventive inspection of the fir-tree root of the blade is an important means to eliminate hidden dangers of equipment ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an ultrasonic imaging detection method for the fir-tree root of a steam turbine blade, which can perform comprehensive, accurate, rapid and intuitive imaging inspection on the fir-tree root of the blade with complex geometric shapes, and solve the problems of small detection range and failure of existing detection methods. The problem of large inspection area

Images