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Appl. Sci. 2017, 7(4), 429; doi:10.3390/app7040429

An Investigation on Eddy Current Pulsed Thermography to Detect Surface Cracks on the Tungsten Carbide Matrix of Polycrystalline Diamond Compact Bit

College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, China
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Author to whom correspondence should be addressed.
Academic Editors: Andrea Paglietti and Cem Selcuk
Received: 22 January 2017 / Revised: 11 April 2017 / Accepted: 17 April 2017 / Published: 23 April 2017
(This article belongs to the Special Issue Structural Health Monitoring (SHM) of Civil Structures)
View Full-Text   |   Download PDF [4037 KB, uploaded 23 April 2017]   |  

Abstract

Polycrystalline diamond compact (PDC) bits are commonly used drill bits in the petroleum drilling industry. Cracks often occur on the surface of a bit, which may result in the unexpected suspension of the drilling operation, or even accidents. Therefore, the detection of surface cracks on PDC bits is of great importance to ensure continuous drilling operation and to prevent accidents. However, it is extremely difficult to detect such cracks by visual inspection or other traditional nondestructive testing (NDT) techniques due to the small size of cracks and the irregular geometry of bits. As one emerging NDT technique, eddy current pulsed thermography (ECPT) can instantly detect surface cracks on metal parts with irregular geometry. In this study, the feasibility of ECPT of detecting surface cracks on the tungsten carbide matrix of PDC bits was investigated. A successive scanning detection mode is proposed to detect surface cracks by using ECPT with a low power heating excitation unit and small-size coils. The influence of excitation duration on the detection result was also investigated. In addition, principal component analysis (PCA) was employed to process the acquired IR image sequences to improve detection sensitivity. Finally, the whole shape of a crack was restored with processed images containing varied cracks segments. Based on the experimental results, we conclude that the surface cracks on the tungsten carbide matrix of PDC bit can be detected effectively and conveniently by ECPT in scanning mode with the aid of PCA. View Full-Text
Keywords: polycrystalline diamond compact (PDC) bits; the tungsten carbide matrix; surface crack detection; eddy current pulsed thermography; PCA polycrystalline diamond compact (PDC) bits; the tungsten carbide matrix; surface crack detection; eddy current pulsed thermography; PCA
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MDPI and ACS Style

Xu, C.; Gong, X.; Zhang, W.; Chen, G. An Investigation on Eddy Current Pulsed Thermography to Detect Surface Cracks on the Tungsten Carbide Matrix of Polycrystalline Diamond Compact Bit. Appl. Sci. 2017, 7, 429.

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