Evaluation of Adhesion and Properties of Sprayed Coating by Ultrasonic Testing Method

1998 ◽  
Author(s):  
Y. Suga ◽  
D. Lian
Keyword(s):  
Experimental Investigation ◽  
Transmission Coefficient ◽  
Ultrasonic Wave ◽  
Ultrasonic Testing ◽  
The Other ◽  
Testing Methods ◽  
Precise Method ◽  
Testing Method ◽  
Sprayed Coating ◽  
Non Destructive

Abstract It is well known that the adhesion of thermal sprayed coating is relatively low and it tends to delaminate from substrate during practical use. Therefore, some testing methods to evaluate the adhesion of coating are proposed and used practically. However, these methods used destructive method and can not be applied for products. Recently some of the authors have proposed a non- destructive method using ultrasonic wave and shown the effectiveness of the method on the evaluation of the adhesion of coating. However, the method is very simple and the measurement is not always precise. On the other hand, the porosity in the coating affects the properties of the coating and some methods to evaluate porosity are proposed. However, every method is not simple and sometimes special equipments are necessary. Therefore simple and precise method has been required. In this study, a new method to evaluate simultaneously the adhesion and properties of thermal sprayed coating is proposed The method uses ultrasonic testing method and the properties are surmised by the impedance of coating detected by ultrasonic surface echo method In this case, since the bottom echo is affected by impedance of the coating, in the calculation of transmittance coefficient the impedance is taken into consideration and adhesion is surmised by the transmission coefficient. As the result of the experimental investigation, it is confirmed that the method proposed is effective to the evaluation of adhesion and properties of sprayed coating.

scholarly journals Detection of Dynamic Modulus and Crack Properties of Asphalt Pavement Using a Non-Destructive Ultrasonic Wave Method

2019 ◽  
Vol 9 (15) ◽  
pp. 2946 ◽  
Author(s):  
Weiguang Zhang ◽  
Muhammad Arfan Akber ◽  
Shuguang Hou ◽  
Jiang Bian ◽  
Dong Zhang ◽  
...  
Keyword(s):  
Finite Element ◽  
Numerical Modeling ◽  
Wave Propagation ◽  
Ultrasonic Wave ◽  
Asphalt Concrete ◽  
Ultrasonic Testing ◽  
Experimental Results ◽  
Dynamic Moduli ◽  
Ultrasonic Wave Propagation ◽  
Non Destructive

Non-destructive ultrasonic testing has attained popularity due to its robustness and cost-effectiveness in monitoring the structural health and performance evaluation of pavements, thus replacing traditional methods. This paper presents the application of an explicit finite element method for the modeling of ultrasonic wave propagation through asphalt concrete. Prior to modeling, non-destructive ultrasonic testing was conducted on four different types of asphalt concrete (AC-13, SMA-13, AC-20, and AM-20). Based on acoustic information (wave velocity) obtained in non-destructive testing (NDT) and density, the dynamic moduli of these asphalt concretes were evaluated and used in numerical modeling of ultrasonic wave propagation using the commercial software package ABAQUS. The ultrasonic wave results obtained by numerical modeling were compared with experimental results. This comparison showed a good fit between the finite element (FE) results and the experimental results and confirmed a good FE approach for ultrasonic wave propagation. In addition, the influence of varying dynamic moduli, density, varying location, and crack size/depth on ultrasonic wave propagation was analyzed.

scholarly journals Pipe Crack Recognition Based on Eddy Current NDT and 2D Impedance Characteristics

2019 ◽  
Vol 9 (4) ◽  
pp. 689
Author(s):  
Lianshuang Dai ◽  
Hao Feng ◽  
Ting Wang ◽  
Wenbo Xuan ◽  
Ziqian Liang ◽  
...  
Keyword(s):  
Eddy Current ◽  
Ultrasonic Testing ◽  
Magnetic Flux Leakage ◽  
Non Destructive Testing ◽  
Testing Methods ◽  
Destructive Testing ◽  
Electromagnetic Acoustic Transducers ◽  
Acoustic Transducers ◽  
Non Destructive ◽  
Flux Leakage

Girth weld cracking of long-distance oil and gas pipelines yields substantial harm to pipeline safety and may cause serious accidents. As of today, non-destructive testing has been one of the most common methods for predicting potential faults and ensuring safe operation. Classical pipeline non-destructive testing methods include magnetic flux leakage testing and the use of ultrasonic testing by electromagnetic acoustic transducers. However, they are incapable of identifying the defects in complex surfaces like girth welds. Magnetic flux leakage testing exhibits poor anti-interference abilities and low space resolution. Ultrasonic testing by electromagnetic acoustic transducers suffer from low conversion efficiency and poor signal quality. In order to overcome the disadvantages of conventional pipeline non-destructive testing methods, we propose an embedded eddy current testing system by leveraging image processing and neural networks. Hough transform and the contour extraction technique are employed to extract the characteristic features from the two-dimensional (2D) eddy current impedance image. Experiment results show that the system can effectively identify the girth weld defects, featuring an accuracy of up to 92%. The low power consumption and compactness of the proposed system makes it a great candidate for pipeline inner inspection.

Comparison of Non-Destructive Testing Techniques

2021 ◽  
Vol 410 ◽  
pp. 862-866
Author(s):  
Oleg B. Bavykin ◽  
Rodion N. Loginov
Keyword(s):  
Welded Joints ◽  
Ultrasonic Testing ◽  
Ultrasonic Method ◽  
Non Destructive Testing ◽  
Testing Methods ◽  
Destructive Testing ◽  
Advantages And Disadvantages ◽  
Comparison Results ◽  
Testing Techniques ◽  
Non Destructive

The article discusses the types of dangerous defects in welded joints. The main methods of non-destructive testing are described, their advantages and disadvantages are briefly reflected. The comparison of the automated ultrasonic testing methods with radiographic ones is given on the example of testing the welded joints of ASME DN350 Py250 pipe fittings with a thickness of the welded edges of 53.9 ÷ 61.3 mm. The comparison results of the methods by the criterion of the accuracy of determining the coordinates of defects are presented, which show the expediency of replacing the automated ultrasonic method with the radiographic one, provided that the thickness of the welded edges is shallow.

scholarly journals PENDUGAAN KEKAKUAN KAYU BORNEO DENGAN METODE GELOMBANG ULTRASONIK

PERENNIAL ◽  
2010 ◽  
Vol 6 (1) ◽  
pp. 20
Author(s):  
. Syahidah ◽  
Tekat Dwi Cahyono
Keyword(s):  
Key Words ◽  
Ultrasonic Wave ◽  
Dynamic Test ◽  
Vertical Position ◽  
Static Test ◽  
Testing Method ◽  
Beam Sample ◽  
Non Destructive ◽  
Test Result

Borneo wood is a name for various species commercial wood. The aimed of this study are measured stifness (MOE) of borneo wood using non destructive method i.e. ultrasonic wave. Fiveteen beam sample were produced from borneo wood about 8 cm thick and 12 cm width with 400 cm, 250 cm and 150 cm length. Beam with 250 cm and 150 cm length produced from beam with 400 cm length after stifness test have done using ultrasonic (dynamic test) and UTM (static test). Result showed that dynamic MOE of borneo wood for 400 cm, 250 cm and 150 cm length, are 19.10 G.Pa, 18.48 G.Pa and 15.90 G.Pa, respectively. Wood about 400 cm and 150 cm length were different significantly. Result also showed that dynamic MOE of borneo wood 30% higher than static MOE at vertical position test for beam with 400 cm length and 20% higher for horisontal position at the same testing method. Key words : Borneo wood, stifness, ultrasonic, MOE, MOR

Heavy-Loaded Components Quality Assurance by Means of Non-Destructive Testing

2014 ◽  
Vol 1040 ◽  
pp. 937-942 ◽  
Author(s):  
Michael Kroening ◽  
Dmitry Sednev ◽  
Yana Salchak
Keyword(s):  
Instrument Development ◽  
Ultrasonic Testing ◽  
Acoustic Scattering ◽  
Metallurgical Industry ◽  
Case Hardening ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Advanced Method ◽  
Testing Method ◽  
Non Destructive

In present paper principles of acoustic scattering in case hardened components were discussed. Improvements of ultrasonic testing method and instrument development opportunities were proposed. Through these investigations, it would be possible to provide an advanced method of ultrasonic testing of case hardening quality, which might be applied in Russian metallurgical industry market. Comparative analysis of characteristics of existing instrument and the proposed instrument was conducted. This article demonstrates all important advantages of the proposed method of nondestructive testing for quality control of heavy-loaded components.

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