Observation of fatigue microcracks and estimation of fatigue strength of a thin sheet arc welded part considering micro-ripples

Matsuda, Kiyoaki; Kodama, Shinji

doi:10.1016/j.ijfatigue.2020.106087

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…Based on the knowledge obtained in this study, it is important to determine the cross-sectional location of fatigue cracks initiation in weaving welds. It is recommended that a fatigue strength evaluation method [12,13] should be applied to that cross-section.…”

Section: Discussionmentioning

confidence: 99%

Fatigue strength improvement method for thin sheet GMA welding joints by weaving

2023

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A method for improving the fatigue strength of thin steel sheet gas metal arc (GMA) welded joints using weaving welding was evaluated. Weaving created peaks and valleys at the weld toe. The valley has high stress triaxiality, and plastic deformation is unlikely to occur. Fatigue cracks occurred from the peaks with gentle toe shapes. Therefore, it is considered that the fatigue strength is improved by reducing the initiation points of the crack and stress concentration at the toe. The fatigue test results showed that the fatigue limit of the weaving welding joint was improved compared with that of the normal welding joint.Furthermore, the optimal weaving condition, which is the relationship between the weaving wavelength and torch swing amplitude, was evaluated. As a consequence, when the wave density is small, the crack initiation point is not restricted to the peak. On the other hand, when the wave density is large, the peak and valley shapes merge and the weaving effect disappears.In addition, undercuts occurred when the swing amplitude became too large. The mechanism of improving the fatigue strength was considered by observing the initiation point of the fatigue microcracks.

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Section: Discussionmentioning

confidence: 99%

Fatigue strength improvement method for thin sheet GMA welding joints by weaving

2023

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“…It was reported that the VHCF strength of the notched specimens decreased as the material hardness decreased [67]. One limitation of this research is that although the heat-treated notched specimens allowed for a simulated fatigue test of the weld toe, they did not include defects, such as micro-ripples, spatter droplets, small undercuts, or microscopic slag inclusions [75,76], that can be detrimental to fatigue strength.…”

Section: Non-ferrous Alloysmentioning

confidence: 96%

Very High Cycle Fatigue of Welds: A Review

England,

Toumpis,

Gorash

2023

Metals

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The design life of welded structures and components extends into the very high cycle fatigue (VHCF) regime across various applications. However, the availability of data on the fatigue behaviour of welded joints in the VHCF regime is limited, particularly when compared to the low and high cycle fatigue regimes. The development of ultrasonic fatigue testing equipment has accelerated fatigue testing and allowed for the VHCF properties of welds to be investigated in a feasible timeframe. In the present review, the emerging research concerning the VHCF behaviour of welds of various steels and non-ferrous alloys are individually explored. Overall, it is observed that welded joints have significantly lower fatigue strength than the base metal in the VHCF regime and that welding defects have a considerable influence on fatigue strength. Through the discussion of the relevant literature, important findings concerning the effects of specimen geometry and fatigue improvement methods are underlined. Furthermore, the guidance provided within design standards is compared, and some examples of VHCF failures of in-service components are highlighted. Finally, perspectives on future directions of investigation are put forward with the aim of encouraging further research in the field of VHCF of welds.

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Effect of cold spray deposition on fatigue strength of arc-welded ultra-high strength steel sheet

Yamaguchi¹,

Shiozaki²,

Tamai³

et al. 2022

International Journal of Fatigue

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Observation of fatigue microcracks and estimation of fatigue strength of a thin sheet arc welded part considering micro-ripples

Cited by 5 publications

References 15 publications

Fatigue strength improvement method for thin sheet GMA welding joints by weaving

Fatigue strength improvement method for thin sheet GMA welding joints by weaving

Very High Cycle Fatigue of Welds: A Review

Effect of cold spray deposition on fatigue strength of arc-welded ultra-high strength steel sheet

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