Experience in the application of the non-destructive method of acoustic emission in the production of titanium billets and products of transport engineering

The article discusses the issue of using the non-destructive method of acoustic emission at the stage of blank production. So, due to the violation of the heat treatment modes, various defects are formed in the starting material, which affects the operational properties of the finished products. To eliminate this problem, the stages of production of titanium blanks and products of transport engineering were studied, such as: heat and mechanical treatment, ultrasonic quality control, determination of the level of mechanical properties and control of the structure. In the course of the research, a method of acoustic emission control was developed and tested. The experiment on setting the locations of defects was carried out on ingots of VT22 titanium alloy during cooling. The reliability of the developed method is confirmed by the existing method of ultrasonic flaw detection. It has been established that this method can be effectively used to control workpieces and machined workpieces for the manufacture of particularly critical mirrors for searching for inhomogeneous inclusions and increasing the efficiency of the technological process by eliminating machining of VT1-0 titanium surfaces with inhomogeneous inclusions. In addition, this method can be used to search for defects commensurate with the grain size of the ingot, as well as significantly smaller sizes.

Модернизация эхометода ультразвуковой дефектоскопии

The modernization of the echo method of ultrasonic flaw detection is considered, which differs in that in addition to the array of transducers in contact with the working (front) surface of the object, one or more receiving transducers on the lateral surface of the object are additionally used. This method of arranging the antenna arrays can significantly improve the resolving power, and in the case of using an antenna array on the lateral surface of the object, obtain additional information for imaging the internal structure of the object. In order to obtain the potential resolution, an ultra-wideband sounding signal with a Gaussian envelope is used in combination with an original signal processing algorithm, including summation, one-way limiting and multiplication of the received signals. Some practical recommendations are given in the work. Potential resolution in various directions has been assessed.

Calibration of Ultrasonic Flaw Detectors in accordance with ISO 22232-1:2020

This paper presents the procedure developed at SCL for the calibration of loop antennas for test frequencies from 9 kHz to 30 MHz in accordance with CISPR 16-1-6:2014+AMD1:2017. The background, measurement model and uncertainty components are introduced and discussed. The expanded measurement uncertainty is estimated as 1.2 dB.

ON ESTIMATION OF THE INFLUENCE OF THE HUMAN FACTOR ON DETECTION OF DEFECTS IN ULTRASONIC FLAW DETECTION AND DEFECTOMETRY

Based on the analysis of the results of ultrasonic testing, a quantitative assessment of the influence of the human factor on the PoD curves built for independent inspectors, several (different) flaw detection techniques was obtained. It is shown that the average value of the change in the probability of detecting flaws, which determines the value of the correction coefficient equal to 0.015 for flaws with a height of 4 to 12 mm (for the defectometry technique) and 0.18 for flaws with a height of 5 to 12 mm (for flaw detection techniques). For flaws less, than 4 mm in height, the average value of the change in the probability of detecting flaws for individual inspectors depends significantly on the height of the flaw. A significant difference in the average value of the change in the probability of detecting flaws and the standard deviation during inspection by flaw detection and defectometry techniques is associated with the difference in the amount of information provided by the inspection techniques and the individual characteristics of the inspectors.

Определение координат отражателей в плоскости, перпендикулярной сварному соединению по эхосигналам, измеренным преобразователями по схеме TOFD

The TOFD method, which is widely used in ultrasonic flaw detection, makes it possible to distinguish a crack from a volume reflector by the phase of the echo signals and to determine its height with high accuracy. However, the TOFD method without scanning the piezoelectric transducers across the weld joint does not allow to determine the displacement of the reflector from the center of the welded joint, which is very important when evaluating the results of the control. The scanning devices used for this purpose have a complex design, their price is higher than that of one-dimensional scanning devices, and, most importantly, the control time increases significantly. If the echo signals reflected from the bottom of the object of control are used, taking into account the change in the wave type, then a combined image of the reflector can be obtained from a set of partial images recovered by the digital focusing antenna (DFA) method. If we use the echo signals measured in the combined mode for each piezoelectric converter, we can estimate the displacement of the reflector across the welded joint with an accuracy of ±1.5 mm. Numerical and model experiments have confirmed the efficiency of the proposed approach.

ULTRASOUND INSPECTION OF COMPOSITE MATERIAL PRODUCTS

Polymer composite materials are used in modern rocket and space engineering, but the question of technical diagnostics of such products is very acute. The study of PCM products showed that the use of a portable ultrasonic flaw detector with high-frequency transducers is possible, but on small particles (product areas) of control.

Ultrasonic non-destructive quality control of products made of polymeric composite materials rocket and space equipment

The development of modern rocket and space technology (RST) is characterized by constant improvement: increasing speed, range and altitude. Improving these characteristics, through modernization, has led to a significant complication of the design of RST and its equipment. Among the most promising materials for the manufacture of RST structures are more often used polymer composite materials (PCM), which are increasingly used in modern RST engineering, especially in cases where no other material meets the new requirements. Quality control of RST products depends on determining the condition of materials in these facilities, both in production and in operating conditions, which must be carried out both in the production process (with the deviation of production processes may form different types of structure heterogeneity: porosity, foreign inclusions, stratification and cracks) and during operation. In polymer composite materials RST, namely to detect defects such as delamination and cracks using ultrasonic non-destructive testing. An analysis of the use of traditional ultrasonic non-destructive testing using a portable ultrasonic flaw detector using high-frequency transducers. It has been determined that it is sufficient to use portable ultrasonic flaw detectors to detect longitudinal cracks or stratifications, but for more reliable detection and detection of defects, completeness of control should use automated ultrasonic control systems that have greater sensitivity and scanning speed. defective zones with the possibility of constructing a qualitative image of the defective zone for further assessment of the performance of the entire structure with PCM.

Определение типа отражателя по амплитудам бликов изображений, восстановленных по разным акустическим схемам

In ultrasonic flaw detection, methods for recording and analyzing echo signals have been developed to determine the type of reflector and its size. The method of digital antenna focusing (DFA) allows you to restore the image of the entire boundary of the discontinuity, using echo signals reflected from the bottom of the control object, taking into account the transformation of the wave type. However, this approach is not always applicable in practice, since the shape of the bottom of the object of control may be unknown. Using the features of the behavior of the reflection coefficient for different types of waves, it is possible to make a conclusion about the type of reflector from the images only on the direct beam. Numerical and model experiments confirmed the efficiency of the proposed approach.

Smartphone-Based Automated Non-Destructive Testing Devices

Currently, non-destructive testing is an interdisciplinary field of science and technology that serves to ensure the safe functioning of complex technical systems in the face of multifactorial risks. In this regard, there is a need to consider new information technologies based on intellectual perception, recognition technology, and general network integration. The purpose of this work was to develop an ultrasonic flaw detector, which uses a smartphone to process the test results, as well as transfer them directly to an powerful information processing center, or to a cloud storage to share operational information with specialists from anywhere in the world.The proposed flaw detector consists of a sensor unit and a smartphone. The exchange of information between the sensor and the smartphone takes place using wireless networks that use "bluetooth" technology. To ensure the operation of the smartphone in the ultrasonic flaw detector mode, the smartphone has software installed that runs in the Android operating system and implements the proposed algorithm of the device, and can serve as a repeater for processing data over a considerable distance (up to hundreds and thousands of kilometers) if it necessary.The experimental data comparative analysis of the developed device with the Einstein-II flaw detector from Modsonic (India) and the TS-2028H+ flaw detector from Tru-Test (New Zealand) showed that the proposed device is not inferior to them in terms of such characteristics as the range of measured thicknesses, the relative error in determining the depth defect and the object thickness. When measuring small thicknesses from 5 to 10 mm, the proposed device even surpasses them, providing a relative measurement error of the order of 1 %, while analogues give this error within 2–3 %.