Fatigue crack repair in welded structures via tungsten inert gas remelting and high frequency mechanical impact

al-Karawi, Hassan; Polach, Franz von Bock und; Al‐Emrani, Mohammad

doi:10.1016/j.jcsr.2020.106200

Cited by 22 publications

(10 citation statements)

References 23 publications

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“…The material properties of both are given in Al‐Karawi. [ 10 ] The testing rig and dimensions of the specimen are shown in Figure 1. Several auxiliary crack detection methods were employed to calibrate the strain drop against the crack size.…”

Section: Methodsmentioning

confidence: 99%

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Crack detection via strain measurements in fatigue testing

al-Karawi¹,

Polach

Al‐Emrani

2021

Strain

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Fatigue cracks have appeared as a significant issue for joints and connections in existing steel structures in the last decades. Therefore, those are a major inspection and maintenance matter for any steel structure's operator. This emphasises the importance of using a reliable detection method to determine the crack size and assessing the severity of such a crack on the structural integrity of a structure. In this article, the effectiveness of strain measurement in detecting fatigue cracks in transversal non‐load carrying welded attachment subjected to out of plane axial loading is studied. Numerical analysis and experimental investigations allowed to correlate the decrease in strain measured by attached gauges to the crack depth at the weld toe. In addition, different strain evolution patterns were found during fatigue testing, and the fracture surfaces of the specimens were observed to interpret these patterns. Moreover, the crack position with respect to the weld toe surface was predicted via strain measurements.

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Section: Methodsmentioning

confidence: 99%

“…Al‐Karawi et al found a correlation between the strain drop and the fatigue crack size in transversal attachment. [ 10 ] Moreover, Otegui et al [ 11 ] attached 10 strain gauges on T‐joint welds to detect crack initiation and early crack growth.…”

Section: Introductionmentioning

confidence: 99%

Crack detection via strain measurements in fatigue testing

al-Karawi¹,

Polach

Al‐Emrani

2021

Strain

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“…In other cases, fatigue tests were aborted without reaching failure; such tests are referred to as "Runout" in the figure, and they indicate the high efficiency of the treatment methods studied. These failure locations could be found in [6], [13] and [31].…”

Section: Resultsmentioning

confidence: 86%

“…Furthermore, HFMI treatment removes any undercut that may occur after TIG remelting as mentioned above. This practice was used in several research articles ( [21], [22], [31], [34]). In all of them, combined TIG-HFMI treatment resulted in a longer fatigue life extension than TIG remelting alone.…”

Section: Future Workmentioning

confidence: 99%

The efficiency of HFMI treatment and TIG remelting for extending the fatigue life of existing welded structures

al-Karawi

Al‐Emrani

2021

Steel Construction

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Different post‐weld treatment methods have been developed to enhance the fatigue strength of welded steel structures and extend the service lives of their components. High‐frequency mechanical impact (HFMI) treatment and tungsten inert gas (TIG) remelting are two methods that have attracted considerable interest in recent decades. This paper presents the results of a study of fatigue life extension for pre‐fatigued welded steel details which can be achieved using HFMI treatment and TIG remelting. More than 250 fatigue test results were collected – including different details such as butt welds, longitudinal attachments, transverse attachments and cover plate attachments. HFMI treatment was found to extend the life considerably when the specimens treated were free from cracks or when existing cracks were < 2.25 mm deep. TIG remelting could extend fatigue lives even with cracks > 4 mm deep. In comparison to TIG remelting, HFMI treatment results in a longer fatigue life extension for pre‐fatigued details, provided existing cracks are < 2.25 mm deep. Regarding TIG remelting, the depth of possible remaining cracks was found to be a substantial parameter when assessing the degree of life extension.

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“…The figure shows the results of several investigations of residual stress, local tensile strength and stress concentration factors at the weld toe of identical specimens treated by different methods. More details about the evaluation of the local hardness, the stress concentration factor and the residual stress can be found in [31].…”

Section: Discussionmentioning

confidence: 99%

The efficiency of HFMI treatment and TIG remelting for extending the fatigue life of existing welded structures

2021

Stahlbau

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Different post-weld treatment methods have been developed to enhance the fatigue strength of welded steel structures and extend the service lives of their components. High-frequency mechanical impact (HFMI) treatment and tungsten inert gas (TIG) remelting are two methods that have attracted considerable interest in recent decades. This paper presents the results of a study of fatigue life extension for pre-fatigued welded steel details which can be achieved using HFMI treatment and TIG remelting. More than 250 fatigue test results were collectedincluding different details such as butt welds, longitudinal attachments, transverse attachments and cover plate attachments. HFMI treatment was found to extend the life considerably when the specimens treated were free from cracks or when existing cracks were < 2.25 mm deep. TIG remelting could extend fatigue lives even with cracks > 4 mm deep. In comparison to TIG remelting, HFMI treatment results in a longer fatigue life extension for pre-fatigued details, provided existing cracks are < 2.25 mm deep. Regarding TIG remelting, the depth of possible remaining cracks was found to be a substantial parameter when assessing the degree of life extension.

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Fatigue crack repair in welded structures via tungsten inert gas remelting and high frequency mechanical impact

Cited by 22 publications

References 23 publications

Crack detection via strain measurements in fatigue testing

Crack detection via strain measurements in fatigue testing

The efficiency of HFMI treatment and TIG remelting for extending the fatigue life of existing welded structures

The efficiency of HFMI treatment and TIG remelting for extending the fatigue life of existing welded structures

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