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

2021 ◽  
Vol 2094 (4) ◽  
pp. 042018
Author(s):  
E Yu Remshev ◽  
A I Olehver ◽  
S A Voinash ◽  
V A Sokolova ◽  
A A Ivanov ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Mechanical Treatment ◽  
Flaw Detection ◽  
Vt22 Titanium Alloy ◽  
Ultrasonic Flaw Detection ◽  
Ultrasonic Flaw ◽  
Titanium Surfaces ◽  
And Control ◽  
Non Destructive

Abstract 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.

scholarly journals Determination of hydrogen-induced damage by an acoustic method

2020 ◽  
pp. 19-28
Author(s):  
V. V. Mishakin ◽  
◽  
A. V. Gonchar ◽  
A. V. Poroshkov ◽  
N. V. Semenova ◽  
...  
Keyword(s):  
Hydrogen Absorption ◽  
Detection Method ◽  
Ultrasonic Method ◽  
Flaw Detection ◽  
Complete Information ◽  
Acoustic Method ◽  
Signal Spectrum ◽  
Ultrasonic Flaw Detection ◽  
Ultrasonic Flaw

The 13HFA corrosion- and cold-resistant steel is studied by an ultrasonic method after hydrogen absorption for 96, 192, and 288 hours. Within the framework of classical flaw detection, it was found that the formation of macrodefects occurs only at 288 hours of hydrogen absorption. In the study of the material by the spectral-acoustic method, it was found that, during hydrogen absorption for 96 and 192 hours, the signal spectrum changes. This indicates the formation of microdefects. It is shown that the determination of the damage by the conventional ultrasonic flaw detection method and the use of the spectral-acoustic method for the evaluation of fracture at the microlevel give more complete information on the state of the investigated alloys.

IDENTIFICATION AND RELIABILITY OF CONTROL IN ULTRASONIC FLAW DETECTION AND DEFECTOMETRY

2020 ◽  
pp. 4-17
Author(s):  
V. G. Badalyan
Keyword(s):  
Ultrasonic Testing ◽  
Flaw Detection ◽  
Roc Curves ◽  
Probability Of Detection ◽  
Ultrasonic Control ◽  
Ultrasonic Flaw Detection ◽  
Control Techniques ◽  
Additional Information ◽  
Ultrasonic Flaw ◽  
Non Destructive

The effectiveness of methods and means of ultrasonic non-destructive control (ultrasonic control) is evaluated by the probability of detecting defects and the reliability of the results of the control. In this work, we reserch the behavior of PoD(a) – the defect detection function, which describes the dependence of the probability of detection of defects on their height, and estimates the reliability of control by means of ROC analysis of the control data. An analysis of the PoD curves obtained by ultrasonic testing with ultrasonic flaw detection and ultrasonic flaw detection instruments demonstrates significantly greater reliability of the use of defectometry techniques and devices. ROC curves constructed using ultrasonic defectometry data make it possible to evaluate the reliability of control of defects of various heights. Analysis of ROC curves provides additional information for optimizing ultrasonic control techniques. The studies were carried out on the data array of ultrasonic testing of welded joints with real cracks.

Application of EDS Technique for OSP Film Thickness Measurement

2006 ◽  
Author(s):  
Prong Kongsubto ◽  
Sirarat Kongwudthiti
Keyword(s):  
Thin Film ◽  
Quantitative Analysis ◽  
Joint Strength ◽  
Critical Factor ◽  
Thickness Measurement ◽  
Ic Manufacturing ◽  
And Control ◽  
Film Thickness Measurement ◽  
Non Destructive

Abstract Organic solderability preservatives (OSPs) pad is one of the pad finishing technologies where Cu pad is coated with a thin film of an organic material to protect Cu from oxidation during storage and many processes in IC manufacturing. Thickness of OSP film is a critical factor that we have to consider and control in order to achieve desirable joint strength. Until now, no non-destructive technique has been proposed to measure OSP thickness on substrate. This paper reports about the development of EDS technique for estimating OSP thickness, starting with determination of the EDS parameter followed by establishing the correlation between C/Cu ratio and OSP thickness and, finally, evaluating the accuracy of the EDS technique for OSP thickness measurement. EDS quantitative analysis was proved that it can be utilized for OSP thickness estimation.

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