Surface crack detection in welds using thermography

Broberg, Patrik

doi:10.1016/j.ndteint.2013.03.008

Cited by 122 publications

(52 citation statements)

References 10 publications

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“…We can note purely analytical approaches [8], [12], [13]. Other approaches were developed in order to take into account "optical" aspect of the defect [14], [15]. Nowadays finite elements methods are very wide-spread with diverse and varied approaches which concern essentially limited on punctual laser using [16], [17].…”

Section: Descriptionmentioning

confidence: 99%

Modeling and optimization of open crack detection by active thermography

Thiam¹,

Kneip²,

Matteı³

et al. 2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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The aim of the presented work is the detection of open defects in metallic materials using laser-material interaction coupled with infrared thermal images. This process is a possible alternative for magnetic particles testing and penetrant testing in the field of non-destructive testing. In this context, a numerical simulation model is implemented with Comsol Multiphysics®. This model allows us to look for the process optimal parameters through numerical experimental designs.

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Section: Descriptionmentioning

confidence: 99%

Modeling and optimization of open crack detection by active thermography

Thiam¹,

Kneip²,

Matteı³

et al. 2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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“…The theory for detecting cracks by thermography using optical excitation by a flash lamp or laser has been explained by Broberg [4]. When light enters a crack it is reflected multiple times and will deposit a larger amount of energy than at a single reflection, in a similar way as in a black-body cavity, and the absorption coefficient will approach 1.…”

Section: Optical Excitation For Detection Of Surface Cracks By Thermomentioning

confidence: 99%

“…Active thermography can be performed by using different excitation techniques, all with pros and cons. Excitation techniques such as laser, white light, induction heating and ultrasonic are found in the literature [3][4][5]. The physical principles are to some extent different between the techniques and the methods are either based on pulsed, continuous or modulated excitation.…”

Section: Introductionmentioning

confidence: 99%

Surface crack detection using infrared thermography and ultraviolet excitation

Runnemalm¹,

Broberg²

2014

Proceedings of the 2014 International Conference on Quantitative InfraRed Thermography

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High signal to noise ratio is important within non-destructive testing. To achieve automatic inspection, including automatic evaluation, it is even more important. Infrared thermography is a suitable method for automatic inspection. One drawback with thermography of metallic structures is that due to shiny surfaces the reflectance is high and the signal to noise ratio will be low. This paper presents results from surface crack detection with thermography using ultraviolet excitation. The tested component is a welded Inconel plate with a highly reflective surface. Ultraviolet excitation is shown to be a suitable excitation method and high signal to noise is achieved.

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“…There are different methodologies based on active thermography depending on the following aspects: type of heating, arrangement of the sample and the heating or excitation source, and size and shape of the thermally excited area [4]. This technique has been established nowadays like a NDT for the detection of internal defects in composites materials such as CFRP [5] The excitation sources can be either optical [3,6] or non-optical as eddy current [7] or ultrasounds [8]. When the excitation source is pulsed, results can be analyzed either in the frequency domain (Pulse-Phase Thermography, PPT) or in the time domain (Thermographic Signal Reconstruction, TSR) [4].…”

Section: Introductionmentioning

confidence: 99%

Cooling rate VS temperature to establish thermographic prediction model in surface cracks in steel

Rodríguez‐Martín¹,

Lagüela²,

González‐Aguilera³

et al. 2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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ABSTRACT:The inspection of steel welds is an important task to ensure the integrity of structures and machines. The inspection process presents two main objectives: ensure that welds meet the geometrical specifications established in the international standards, and analyze the existence of flaws. The most critical flaws to be detected during welding inspection are cracks, because their propagation under stress conditions can cause the collapse of the welded structures or the failure of the machines with welded elements. The technological requirements in nondestructive testing (NDT) for the inspection of surface cracks should not be as complex as the requirements for detection of internal cracks. However, the technique used must be efficient enough to ensure the full detection of surface defects and imperfections, including those of difficult visual detection such as little surface cracks or internal cracks open to surface. Active thermography presents an enormous detection potential for surface cracks in welding: allowing the depth estimation of the crack from the processing of the thermographic data. For this aim, the thermographic test can be designed either to evaluate the absolute temperature after heating (as a thermal stimulation of the material towards the increase in contrast between different zones of the crack) or to evaluate the cooling rate during the cooling posterior to this heating. In this contribution, a comparison between the two methods mentioned for crack evaluation is raised. The results of temperature and cooling rate for the same crack are respectively correlated with the depth data of the crack obtained from a macro-photogrammetric procedure.

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Surface crack detection in welds using thermography

Cited by 122 publications

References 10 publications

Modeling and optimization of open crack detection by active thermography

Modeling and optimization of open crack detection by active thermography

Surface crack detection using infrared thermography and ultraviolet excitation

Cooling rate VS temperature to establish thermographic prediction model in surface cracks in steel

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