Ultrasonic contact type flaw detection method for large-thickness part
A flaw detection and ultrasonic technology, which is applied in the analysis of solids by using sound waves/ultrasonic waves/infrasonic waves, material analysis by using sound waves/ultrasonic waves/infrasonic waves, and measuring devices. It can solve problems such as high noise and inaccurate test results, and achieve accurate results. , the effect of simple method
Pending Publication Date: 2022-04-05
中航金属材料理化检测科技有限公司
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Problems solved by technology
[0004] The purpose of the present invention is to provide a method of ultrasonic contact flaw detection for large thickness parts, which solves the problem of inaccurate detection results caused by high noise in the detection of large thickness parts by ultrasonic contact method in the prior art
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[0098] Select GH141 as the research object, use different frequency and different wafer diameter probes, determine the instrument parameters, and determine the selection of reasonable probe and instrument parameters according to the analysis of the test results, and optimize the detection process. Carry out flaw detection detection by the inventive method:
[0099] Material GH141 produced by ATI company, specification Ф250 bar flaw detection test
[0100] Ultrasonic flaw detection instrument: Masterscan 700M
[0101] The near-field values of different probes are calculated by formula (1), as follows:
[0102] V104 Frequency 2.25MHz Chip diameter 25mm Near field length N=59.5mm 3N=178mm
[0103] V105 Frequency 2.25MHz Chip diameter 19mm Near field length N=34mm 3N=102mm
[0104] V107 Frequency 5MHz Chip diameter 25mm Near field length N=132mm 3N=396mm
[0105] V108 Frequency 5MHz Chip diameter 19mm Near field length N=76mm 3N=228mm
[0106] V109 Frequency 5MHz Chip diame...
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Abstract
The invention discloses an ultrasonic contact type flaw detection method for a large-thickness part, which comprises the following steps of: 1, screening an ultrasonic probe according to the nominal frequency of the probe, the diameter of a wafer and the near-field intensity of the probe by taking the part with the thickness of not less than 200mm as a flaw detection object; 2, measuring and calculating an attenuation coefficient, a sound path distance attenuation signal amplitude difference value and detection sensitivity by adopting a wave flaw detector in cooperation with an ultrasonic probe; step 3, obtaining a flaw detection result of full-sound-path attenuation according to the amplitude difference value of the full-sound-path attenuation signals, detecting full-claimed noise through an ultrasonic flaw detector, if the full-claimed noise is not greater than 66.7%, adopting the flaw detection result of the full-sound-path attenuation as a final detection result, and if the full-claimed noise is not greater than 66.7%, adopting the flaw detection result of the full-sound-path attenuation as the final detection result. Otherwise, calculating a flaw detection result adopting semi-sonic path distance attenuation as a final detection result. The problem that in the prior art, due to the fact that large-thickness parts are detected through an ultrasonic contact method, the noise is high, and the detection result is inaccurate is solved.
Description
technical field [0001] The invention belongs to the technical field of flaw detection and relates to an ultrasonic contact flaw detection method for parts with large thickness. Background technique [0002] The detection of parts is usually carried out by ultrasonic contact method, which can quickly, conveniently, non-destructively and accurately detect, locate, evaluate and diagnose various defects (cracks, inclusions, folds, pores, sand holes, etc.) inside the workpiece . [0003] In recent years, with the extensive use of new aviation materials, the size of the parts is too large, especially for parts with a thickness of more than 200mm. For example, the materials used by the new aircraft of the main engine factory include TC4-DT, TC21, TC18 and other large-scale parts, and the difficulty of flaw detection increases. Large, there are also many coarse-grained materials such as GH141, GH698, etc., whose flaw detection noise is relatively high, and high noise seriously affe...
Claims
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IPC IPC(8): G01N29/11G01N29/30
Inventor 惠文丽龚小琦李文超
Owner 中航金属材料理化检测科技有限公司