IIW recommendations on methods for improving the fatigue strength of welded joints

Haagensen, P.J.; Maddox, S. J.

doi:10.1533/9781782420651

Cited by 80 publications

(106 citation statements)

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“…On the other hand, other techniques, such as post-weld treatment methods, are becoming more popular for both increasing the fatigue strength of new structures and repairing existing structures. In general, post-weld treatment methods can be divided into two groups: weld profile modification methods and weld residual stress modification methods [4]. The goals of the former methods are (i) to remove or reduce the size of the weld toe flaws, which may result in an extended crack initiation phase for the fatigue life, and (ii) to reduce the local stress concentration due to the weld profile by achieving a smooth transition between the plate and weld face.…”

Section: Introductionmentioning

confidence: 99%

“…The best-known weld profile modification methods are machining or grinding of the weld seam and toe and re-melting the weld toe by TIG, plasma or laser dressing. For the weld residual stress modification methods, the main aim is to eliminate the high tensile residual stress in the weld toe region and to induce compressive residual stresses at the weld toe [4]. Hammer and needle peening are two of the best-known methods.…”

Section: Introductionmentioning

confidence: 99%

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Review of fatigue data for welds improved by tungsten inert gas dressing

Yıldırım

2015

International Journal of Fatigue

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Review of fatigue data for welds improved by tungsten inert gas dressing

Yıldırım

2015

International Journal of Fatigue

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“…The useful lives of existing steel structures can be extended by rehabilitating fatigue critical details. Several fatigue repair and retrofit methods have been proposed and studied for extending the fatigue lives of existing welded steel structures in the past few decades [1][2][3][4]. Among these methods, residual stress-based post-weld treatment (PWT) or peening methods have been found to be reasonably economical and reliable [2,3].…”

Section: Introductionmentioning

confidence: 99%

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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“…It can be further deduced that joints presenting improved weld profiles by grinding or TIGdressing, may also experience the benefit from enhanced strength of the BM, as it was observed in different studies [2,3,23,24]. These improvement techniques not only re-shape weld profile, but also reduce the amount of defects at the weld toe [25]. Therefore, smaller initial flaw sizes can be assumed.…”

Section: Analyses and Discussionmentioning

confidence: 83%

Influence of static strength on the fatigue resistance of welds

et al. 2018

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Abstract. The present paper deals with a fracture mechanic approach that employs the Resistance-Curve concept, in order to predict fatigue endurances of welded components, with different tensile strengths of the base metal. The Resistance-Curve method compares the total driving force applied to a crack with its threshold for propagation, both defined as a function of crack length. The former depends on load scheme and weld geometry and it can be obtained from finite element analyses, while the second is inherently related to weld resistance. Results obtained herein showed that threshold curve shape is changed when static strength of the base material is modified. Consequently, its interaction with the driving force differed, giving raise to different fatigue endurances for various values of the tensile strength. However, this effect is only likely to be leveraged, provided that the initial crack length is small enough. In real welded structures, the presence of defects demands longer initial crack lengths to be used in calculations, at which the benefit of enhanced strength is minimised or even inverted. Moreover, at these lengths, the growing process is mainly controlled by weld geometry and long crack propagation threshold, whereas local properties become less important in fatigue limit prediction.

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IIW recommendations on methods for improving the fatigue strength of welded joints

Cited by 80 publications

References 0 publications

Review of fatigue data for welds improved by tungsten inert gas dressing

Review of fatigue data for welds improved by tungsten inert gas dressing

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

Influence of static strength on the fatigue resistance of welds

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