Methods for fatigue strength improvement by weld toe treatment

Miki, Chitoshi; Anami, Kengo; Tani, Hideki; Sugimoto, Ichiro

doi:10.1080/09507119909449006

Cited by 7 publications

(1 citation statement)

References 4 publications

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“…The main causes of fatigue crack are stress concentration, residual stress, and high applied stress level; some treatments are usually performed to improve fatigue strength, such as TIG-dressing, grinding and hammer peening [3]. Recently adhesive bonding for fiber reinforced polymers (FRP) reinforcement has become a promising joining technology due to lightweight, uniform stress distribution and the elimination of local stress concentrations.…”

Section: Introductionmentioning

confidence: 99%

Compressive Behavior of Steel Members Reinforced by Patch Plate with Welding and Bonding

Liu¹,

Hirohata²

2018

OJCE

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Repair and reinformcement of aged civil steel structures is one of the important issues for maintaining and using them for a long term. For repair and reinforcement of deteriorated civil steel structures due to fatigue and corrosion, patch plate reinforcement is widely applied. Bolting is generally used because of easy quality control and many construction achievements. However, bolting has downsides including holes made and weight increase. Welding is considered to overcome these demerits but in reality the application of welding is unsatisfactory due to the possibility of fatigue crack occurring from the welded part. In this study, a patch plate strengthening system of welded joint assisted with bonding has been proposed. The compressive behaviors of weld-bond jointed specimen were investigated by a series of experiments and FE analysis. It was confirmed that use of welding and bonding was effective to enhance compressive strength of specimen, due to better load-carrying capacity of patch plate compared with sole use of welding.

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Section: Introductionmentioning

confidence: 99%

Compressive Behavior of Steel Members Reinforced by Patch Plate with Welding and Bonding

Liu¹,

Hirohata²

2018

OJCE

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Fatigue strength improvement of weld joints with cope hole

2013

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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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Methods for fatigue strength improvement by weld toe treatment

Cited by 7 publications

References 4 publications

Compressive Behavior of Steel Members Reinforced by Patch Plate with Welding and Bonding

Compressive Behavior of Steel Members Reinforced by Patch Plate with Welding and Bonding

Fatigue strength improvement of weld joints with cope hole

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

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