Weld detail fatigue life improvement techniques. Part 2: application to ship structures

Kirkhope, K.J.; Bell, Robert A.; Caron, L.; Basu, Roger; Ma, Kai-Tung

doi:10.1016/s0951-8339(99)00031-3

Cited by 46 publications

(24 citation statements)

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“…The prevailing codes of practice [2,6] allow some increase in the estimated fatigue life if the post-weld treatment includes the toe grinding. In addition, many experimental efforts [18][19][20][21][22][23][24][25] have demonstrated the enhancement provided by the weld toe grinding on the fatigue life of welded joints. Polezhayeva et al [18] have proved, through an experimental investigation, that the weld toe burr grinding improves the fatigue strength by a factor of more than 1.5 for welded DH36 steel specimens under the high-cycle fatigue loading.…”

Section: Introductionmentioning

confidence: 99%

Fatigue performance of tubular X-joints with PJP+ welds: I — Experimental study

Qian

Petchdemaneengam

Swaddiwudhipong

et al. 2013

Journal of Constructional Steel Research

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Section: Introductionmentioning

confidence: 99%

Fatigue performance of tubular X-joints with PJP+ welds: I — Experimental study

Qian

Petchdemaneengam

Swaddiwudhipong

et al. 2013

Journal of Constructional Steel Research

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“…Techniques such as: TIG and plasma dressing, burr grinding, needle, shot and hammer peening have been studied in last decades and reported in numerous papers [7][8][9][10][11]. More recently, some attention has been placed on the investigation of high frequency peening treatment, referred to as ultrasonic impact treatment or as ultrasonic peening, that has proved to be an efficient way for fatigue life improvement [12,13].…”

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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“…The general trend shows that the higher the steel grade, the bigger increase in fatigue strength. Some papers stated that this is only valid for the residual stress methods [4,5] nevertheless the numbers show this trend even for burr grinding and TIG-dressing. Therefore, the highest values considered will be assigned to the highest steel grade the lowest to the lowest grade.…”

Section: Research Resultsmentioning

confidence: 98%

Cost savings using different post-welding treatments on an I-beam subject to fatigue load

2014

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In the framework of this work research has been carried out to obtain current data on the potential of post weld treatment (PWT) since new PWT technologies appeared in the last years, and the older technologies have been improved. The economy of post-welding treatments is illustrated by means of a numerical example of a simply supported welded I-beam loaded in bending by a pair of pulsating forces. The vertical stiffeners are welded to the I-beam upper flange by double fillet welds, which cause a significant decrease of fatigue stress range. This low fatigue stress range is improved by various post-welding treatments. Based on the published experimental data, it is possible to determine the measure of the increase of the fatigue stress range as well as the required treatment time for grinding, TIG dressing, hammer peening and ultrasonic impact treatment. This article provides an overview of current PWT methods and the possible improvement in fatigue strength. Furthermore, optimization of a welded I-beam has been conducted to reduce the fabrication cost. The data from the research in the form of increase in fatigue strength and application speed were included in this optimization. The treatment time is included into the cost function, and the improved fatigue stress range is considered in the fatigue constraint. The comparison of costs for optimum structural versions with and without treatments shows the economy of different treatment methods. This comparison helps designers to consider the applicability of PWT and the select the best available.

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Weld detail fatigue life improvement techniques. Part 2: application to ship structures

Cited by 46 publications

References 1 publication

Fatigue performance of tubular X-joints with PJP+ welds: I — Experimental study

Fatigue performance of tubular X-joints with PJP+ welds: I — Experimental study

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

Cost savings using different post-welding treatments on an I-beam subject to fatigue load

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