Effect of quality control parameter variations on the fatigue performance of ultrasonic impact treated welds

Yekta, Rana Tehrani; Ghahremani, Kasra; Walbridge, Scott

doi:10.1016/j.ijfatigue.2013.06.023

Cited by 64 publications

(75 citation statements)

References 12 publications

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“…in [7,8]. In addition to the beneficial residual stress effects, possible secondary benefits of impact treatments such increasing the weld toe radius and thus reducing the local stress concentration factor have also been identified and are being investigated [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…The effectiveness of HFMI treatments to improve the fatigue strength of welded details has been proven in many recent experimental and analytical studies (e.g. [9][10][11][12][13][14][15]). These studies have investigated the use of HFMI treatments for application to both existing fatigue deficient weld details and new high-strength steel structures.…”

Section: Introductionmentioning

confidence: 99%

“…A recent study at the University of Waterloo, Canada [9,15], was undertaken to investigate the fatigue performance of structural steel welds subjected to HFMI treatment, at various levels simulating under-, proper, and over-treatment. Another goal in that study was to relate the fatigue performance of the treated welds to geometric and metallurgical properties that can be measured to control the treatment quality.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, indent depth measurements were confirmed to be an effective means for verifying treatment quality. Indent depth can be measured using a weld inspector's depth gauge or by taking silicon impressions of the weld toe and then slicing them to measure the treated weld toe radius and indent depth [7,9]. However, these methods each suffer from limitations related to the level of accuracy and/or repeatability, the time and labour required, and the difficulties that may arise in situations where access or space are limited.…”

Section: Introductionmentioning

confidence: 99%

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Quality assurance for high-frequency mechanical impact (HFMI) treatment of welds using handheld 3D laser scanning technology

et al. 2014

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The idea of using 3D point clouds obtained with the aid of a handheld 3D laser scanner for the quality assurance of high-frequency mechanical impact (HFMI) treatment is proposed and demonstrated in this paper. The effectiveness of impact treatments for extending the fatigue lives of welded structures has been demonstrated in numerous studies. Guidelines for the proper execution of impact treatments have been developed. A lack of suitable quality assurance (QA) procedures for accepting or rejecting the treatment after completion has been previously identified. In contrast with the existing QA procedures, which are based mainly on controlling inputs and visual inspection, a technology-based, quantitative methodology is developed in this paper. Five welded specimens were subjected to impact treatment at various levels to simulate under-, proper, and over-treatment. A handheld 3D laser scanner was then used to facilitate a point cloud-based method to determine the geometric parameters of the treated weld toe groove, which were then measured manually. The results show that the proposed methodology is successful in identifying the different treatment levels. This approach has a number of advantages over the existing QA methods, including the following: providing quantitative measures, ease of use, and archive-ability.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quality assurance for high-frequency mechanical impact (HFMI) treatment of welds using handheld 3D laser scanning technology

et al. 2014

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“…The improvement effect of PWT techniques depends on the quality control parameter variations. For UIT, it was investigated in [32]. The welded joints can be over-treated and under-treated.…”

Section: Research Resultsmentioning

confidence: 99%

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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Numerical fatigue life analysis of a high frequency mechanical impact treated industrial component based on damage mechanics models

Schubnell

Farajian

Däuwel

et al. 2018

Materialwissenschaft Werkst

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After post weld treatment with high frequency mechanical impact (HFMI) treatment of welds, a significant increase of fatigue life (up to a factor of 10) can be achieved. During the last years numerous experimental tests of welded joints with simple geometry under constant amplitude loading have been performed to quantify the positive effect of high frequency mechanical impact treatment. Due to the lack of methods for the prediction of the high frequency mechanical impact benefits, a widespread use of this process is not the case yet. Furthermore, it is still not clear if the results of these fatigue tests can be transferred to complex geometries and complex loading conditions such as in industrial applications. Therefore, an approach to assess the fatigue life of complex welded structures under variable amplitude loading was developed. For this purpose, high frequency mechanical impact treatment and fatigue load of simple welded specimen made of S690QL steel were simulated with finite element analysis (FEA) firstly. Then, the needed damage parameters for the fatigue life correlation were evaluated from the finite element postprocessing. The calculated life time to crack initiation was in good agreement with the experimental fatigue test results. In the next step, this procedure was implemented on a welded arm of an evacuator of type EW180B of the company Volvo Construction Equipment made of S700MC. The variable amplitude load measured under real service condition was transferred to single constant amplitude load cycles using a rainflow-counting algorithm. By simulation and damage mechanics evaluation of each load cycle the total damage sum could be calculated and compared with the experimental results from Volvo Construction Equipment.Keywords: Fatigue / welding / residual stresses / high frequency mechanical impact (HFMI) / finite element analysis (FEA) Nach einer Schweißnahtnachbehandlung mittels Hochfrequenzhämmern (engl. high frequency mechanical impact treatment (HFMI)) kann eine signifikante Lebensdauerverlängerung des Bauteils (bis zu einem 10-fachen) festgestellt werden. Während der letzten Jahre wurde dieser positive Effekt vielfach experimentell mit einfachen Proben-

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Effect of quality control parameter variations on the fatigue performance of ultrasonic impact treated welds

Cited by 64 publications

References 12 publications

Quality assurance for high-frequency mechanical impact (HFMI) treatment of welds using handheld 3D laser scanning technology

Quality assurance for high-frequency mechanical impact (HFMI) treatment of welds using handheld 3D laser scanning technology

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

Numerical fatigue life analysis of a high frequency mechanical impact treated industrial component based on damage mechanics models

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