Nondestructive Evaluation of Surface Defects Using Scanning Infrared Thermography

2009 ◽  
Vol 23 (4) ◽  
pp. 716-724 ◽  
Author(s):  
C. Dalton ◽  
B. Olson ◽  
F. C. Lai
Keyword(s):  
Nondestructive Evaluation ◽  
Infrared Thermography ◽  
Surface Defects

scholarly journals Infrared Thermography for Weld Inspection: Feasibility and Application

2018 ◽  
Vol 3 (4) ◽  
pp. 45 ◽  
Author(s):  
Sattar Dorafshan ◽  
Marc Maguire ◽  
William Collins
Keyword(s):  
Infrared Thermography ◽  
Ultrasonic Testing ◽  
Surface Defects ◽  
Contact Method ◽  
Lack Of Fusion ◽  
Limited Success ◽  
Skilled Operator ◽  
Highly Skilled ◽  
Weld Inspection

Traditional ultrasonic testing (UT) techniques have been widely used to detect surface and sub-surface defects of welds. UT inspection is a contact method which burdens the manufacturer by storing hot specimens for inspection when the material is cool. Additionally, UT is only valid for 5 mm specimens or thicker and requires a highly skilled operator to perform the inspections and interpret the signals. Infrared thermography (IRT) has the potential to be implemented for weld inspections due to its non-contact nature. In this study, the feasibility of using IRT to overcome the limitations of UT inspection is investigated to detect inclusion, porosity, cracking, and lack of fusion in 38 weld specimens with thicknesses of 3, 8 and 13 mm. UT inspection was also performed to locate regions containing defects in the 8 mm and 13 mm specimens. Results showed that regions diagnosed with defects by the UT inspection lost heat faster than the sound weld. The IRT method was applied to six 3 mm specimens to detect their defects and successfully detected lack of fusion in one of them. All specimens were cut at the locations indicated by UT and IRT methods which proved the presence of a defect in 86% of the specimens. Despite the agreement with the UT inspection, the proposed IRT method had limited success in locating the defects in the 8 mm specimens. To fully implement in-line IRT-based weld inspections more investigations are required.

scholarly journals Nondestructive Evaluation of FRP-Concrete Interface Bond due to Surface Defects

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Nur Yazdani ◽  
Eyosias Beneberu ◽  
Mina Riad
Keyword(s):  
Nondestructive Evaluation ◽  
Surface Defects ◽  
Sample Surface ◽  
Small Scale ◽  
Bond Quality ◽  
Related Factors ◽  
Cfrp Laminates ◽  
Surface Wetness ◽  
Externally Bonded ◽  
Ground Penetrating

Carbon fiber-reinforced polymer (CFRP) laminates have been successfully used as externally bonded reinforcements for retrofitting, strengthening, and confinement of concrete structures. The adequacy of the CFRP-concrete bonding largely depends on the bond quality and integrity. The bond quality may be compromised during the CFRP installation process due to various factors. In this study, the effect of four such construction-related factors was assessed through nondestructive evaluation (NDE) methods, and quantification of the levels of CFRP debonding was achieved. The factors were surface cleanliness, surface wetness, upward vs. downward application, and surface voids. A common unidirectional CFRP was applied to small-scale concrete samples with factorial combinations. Ground-penetrating radar and thermography NDE methods were applied to detect possible disbonds at CFRP-concrete interfaces. Thermography was found to clearly detect all four factors, while the GPR was only effective for detecting the surface voids only. The thermal images overpredicted the amount of debonded CFRP areas by about 25%, possibly due to scaling errors between the thermograph and the sample surface. The maximum debonded CFRP area in any sample was about two percent of the total CFRP area. This is a negligible amount of debonding, showing that the factors considered are unlikely to significantly affect the laminate performance or any CFRP contribution to the concrete member strength or confinement.

2842 Nondestructive Evaluation of BGA Solder Balls using Infrared Thermography Method

2006 ◽  
Vol 2006.1 (0) ◽  
pp. 333-334
Author(s):  
Hiroyuki HAJI ◽  
Takehiro OUSE ◽  
Chihiro IWAMOTO ◽  
Shinobu SATONAKA ◽  
Hiroaki KOGA
Keyword(s):  
Nondestructive Evaluation ◽  
Infrared Thermography ◽  
Solder Balls
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