Abstract:
PROBLEM TO BE SOLVED: To provide an ultrasonic inspection method and an ultrasonic inspection device capable of accurately and efficiently detecting a defect and the like even in a place and a part difficult for performing the ultrasonic inspection.SOLUTION: Ultrasonic waves are traverse waves. In a sound test object, a phased array probe 2 is arranged in advance on one side of a sound welded part, and a plurality of traverse waves focused on an arbitrary point is transmitted by making angles of refraction to be different from each other so as to prepare sound part data, and the maximum value of the reflection signal is obtained as a reference value. In an inspection object 100, the phased array probe 2 is arranged on one side of a welded part 101, and the plurality of traverse waves focused on the arbitrary point is transmitted by making angles of refraction to be different from each other so as to prepare inspection part data. A signal strength ratio is obtained by dividing the inspection part data by the reference value. When the signal intensity ratio is equal to or more than a specified value, the inspection object is determined to be defective.
Abstract:
PROBLEM TO BE SOLVED: To provide a thickness measuring method by use of ultrasonic waves for extracting only reflection echoes based on thickness of an object automatically and measuring thickness of the object with high precision. SOLUTION: This thickness measuring method includes: a measuring process for detecting waveforms of reflection echoes by generating ultrasonics from an ultrasonic probe at each measuring position of the object; a peak detection process for setting a scope of detection in the direction of thickness Z of the object and detecting a peak from each detected waveform; a peak apportioning process for preparing a three-dimensional virtual space having a shape obtained from the object, dividing the space in the direction of length X, the direction of width Y, and the direction of thickness Z of the object to form many zones, apportioning the peak positions to each of these zones, and calculating the number of peak positions in each zone; a grouping process for forming a plurality of groups by connecting the continuous zones where the number of peaks is calculated; and a thickness computing process for separating a zone constituting the group being non-continuous from the zones constituting the groups being continuous in the direction of length X, the direction of width Y, and the direction of thickness Z of the object and computing thickness of the object. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for detecting a flaw of a clamp-type pipe joint with which presence of a flaw in a metal sealing member can be easily detected without deteriorating productivity, and to provide an ultrasonic probe pair used for the same.SOLUTION: There is provided a method for detecting a flaw of a clamp-type pipe joint 10 provided on pipes 11 and 12 and for attaching clamp members 23 and 24 on an outer periphery of diameter expansion connection parts 13 and 14 that are butted with each other via a metal sealing member 17 and applying clamping force to the diameter expansion connection parts 13 and 14 in the radial direction to press against each other and fix them . The method includes: inserting an ultrasonic probe pair 36 having a transmission side angle probe 37 and a reception side angle probe 38 into a gap between the opposing clamp members 23 and 24, in a state where the clamp members 23 and 24 are attached to the diameter expansion connection parts 13 and 14; comparing a waveform of an ultrasonic wave A propagating the pipe joint and a waveform of an ultrasonic wave B propagating through a flawless test sample; and detecting presence of a flaw in the metal sealing member 17. The ultrasonic probe pair 36 includes long rod members 41 with a rectangular cross section including a transmitter 39 and a receiver 43, and terminal boxes 42.