Investigation of the fatigue behaviour of the welded joints treated by TIG dressing and ultrasonic peening under variable-amplitude load

Huo, Lixing; Wang, Dongpo; Zhang, Yufeng

doi:10.1016/j.ijfatigue.2004.05.009

Cited by 115 publications

(47 citation statements)

References 3 publications

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“…The results of fatigue testing showed that USP is one of the most efficient techniques for increasing the fatigue life of welded elements as compared improvement treatments such as grinding, TIG-dressing, shot peening, hammer peening, etc. Until now, techniques such as shot peening and ultrasonic peening treatment have been studied and applied particularly for fatigue designs of welded structures in order to improve their fatigue performances by means of induced compressive residual stress [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Improvement in fatigue life of Al 7475-T7351 alloy specimens by applying ultrasonic and microshot peening

Ramos

Ferreira

et al. 2016

International Journal of Fatigue

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Section: Introductionmentioning

confidence: 99%

Improvement in fatigue life of Al 7475-T7351 alloy specimens by applying ultrasonic and microshot peening

Ramos

Ferreira

et al. 2016

International Journal of Fatigue

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“…10000 to 500000 cycles [15]. Since the best benefits obtained in the high strength steels appear to be related to the introduction of residual stresses, some studies have been conducted in order to analyze the effect of relaxation of these stresses under constant and variable amplitude loading and the effect of variable amplitude loading on the benefits of the improved joints [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Fatigue behaviour of T welded joints rehabilitated by tungsten inert gas and plasma dressing

Ramalho

Ferreira

Branco³

2011

Materials & Design

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This paper concerns a fatigue study on the effect of tungsten inert gas (TIG) and plasma dressing in non-load-carrying fillet welds of structural steel with medium strength. The fatigue tests were performed in three point bending at the main plate under constant amplitude loading, with a stress ratio of R=0.05 and a frequency of 7 Hz.Fatigue results are presented in the form of nominal stress range versus fatigue life (S-N) curves obtained from the as welded joints and the TIG dressing joints at the welded toe. These results were compared with the ones obtained in repaired joints, where TIG and plasma dressing were applied at the welded toes, containing fatigue cracks with a depth of 3-5 mm in the main plate and through the plate thickness. A deficient repair was obtained by TIG dressing, caused by the excessive depth of the crack. A reasonable fatigue life benefits were obtained with plasma dressing. Good results were obtained with the TIG dressing technique for specimens with shallower initial defects (depth lesser than 2.5 mm).The fatigue life benefits were presented in terms of a gain parameter assessed using both experimental data and life predictions based on the fatigue crack propagation law.

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“…Typically, shot peening produces compressive residual stress to depths of between 100 and 500 µm accompanied by high levels of cold work (15-40%) [8]. In UIT, a high-frequency acoustic force (20-30 kHz) is applied, often by means of a portable tool, to the surface in order to introduce beneficial compressive stresses [4,9]. LSP involves the generation of plastic deformation to the surface layers through laser-driven shock waves, generating compressive residual stresses to up to several millimetres in depth.…”

mentioning

confidence: 99%

Engineering the residual stress state and microstructure of stainless steel with mechanical surface treatments

et al. 2010

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Four mechanical surface treatments have been considered for the application to austenitic stainless steel structures. Shot peening (SP), laser shock peening (LSP), ultrasonic impact treatment (UIT) and water jet cavitation peening (WJCP), also known as cavitation shotless peening (CSP), have been applied to 8 mm thick Type 304 austenitic stainless steel coupons. This study considers the merits of each of these mechanical surface treatments in terms of their effect on the surface roughness, microstructure, level of plastic work and through thickness residual stress distribution. Microstructural studies have revealed the formation of martensite close to the treated surface for each process. Residual stress measurements in the samples show compressive stresses to a significantly greater depth for the LSP, UIT and WJCP samples compared to the more conventional SP treated sample.

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Investigation of the fatigue behaviour of the welded joints treated by TIG dressing and ultrasonic peening under variable-amplitude load

Cited by 115 publications

References 3 publications

Improvement in fatigue life of Al 7475-T7351 alloy specimens by applying ultrasonic and microshot peening

Improvement in fatigue life of Al 7475-T7351 alloy specimens by applying ultrasonic and microshot peening

Fatigue behaviour of T welded joints rehabilitated by tungsten inert gas and plasma dressing

Engineering the residual stress state and microstructure of stainless steel with mechanical surface treatments

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