IIW Guidelines on Weld Quality in Relationship to Fatigue Strength

Jönsson, Bertil; Dobmann, Gerd; Hobbacher, A. F.; Kassner, M.; Marquis, Gary

doi:10.1007/978-3-319-19198-0

Cited by 45 publications

(49 citation statements)

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“…As a result, this standard was developed in 2008, by considering IIW Recommendations [5]. Later, IIW published its own guideline to weld quality systems [17], based on VOLVO standard. In parallel, ISO added fatigue consideration to its latest version in 2014 [1].…”

Section: Volvo Std 181-0004 [19]mentioning

confidence: 99%

Undercut tolerances in industry from a fracture mechanic perspective

Steimbreger

Chapetti

2018

MATEC Web Conf.

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Abstract.Fatigue is an important damage mechanism that particularly affects welded components, since they are likely to present residual stresses, inhomogeneities and stress raisers. Assessment of cyclic load effects on welds has concerned both industries and scientist for decades; unexpected failure must be prevented and at the same time, structures must withstand design loads with minimum requirements of material. All these facts together with economic issues have lead to the creation of normative that rule designing and construction of welded components. Particularly, toe undercuts are generally found in large structures, and large scatter and disagreement exists towards their significance and effects. Documents usually limit only their depth without considering radius, width or length, and there is currently no explanation to that fact. Understanding the damaging process will also help to set less conservative tolerances, with consequent cost reduction due to less demanding inspection. The present paper deals with a fracture mechanic approach that uses the Resistance Curve concept to predict fatigue limit of welded components with undercuts. Results revealed that depth is the most influencing variable, and it can be used as the limiting parameter in design regulations. Moreover, good correlation was obtained with FAT values normally assigned to this kind of defect.

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Section: Volvo Std 181-0004 [19]mentioning

confidence: 99%

Undercut tolerances in industry from a fracture mechanic perspective

Steimbreger

Chapetti

2018

MATEC Web Conf.

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“…Other works observed initial crack-like defect depths of about 10-120 µm [14], 20-150 µm [15] or 10-400 µm [16], according to the welding conditions. In IIW guidelines [17] initial crack length of 50-150 mm is recommended for fracture mechanics applications. Radaj and Sonsino [18] have recommended an initial crack size a i = 100-250 µm for life prediction in welded structures.…”

Section: The Simplifying Hypothesesmentioning

confidence: 99%

A simple expression to estimate the fatigue endurance of welded joints

Chapetti

Steimbreger

2018

MATEC Web Conf.

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Abstract.A simple expression is proposed to estimate the fatigue endurance of welded joints that can be used to understand and analyze in a simple way the influence of the main geometrical, mechanical and material effects (weld geometry, local geometry, material properties, residual stresses and size of defects). The proposed expression was derived from the results of the analysis of the fatigue strength of welds studied by means of a fracture mechanics approach that takes into account the fatigue behavior of short cracks by using the resistance curve method. For that purpose numerical simulation of transversely stressed butt, T and cruciform joints were performed.

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“…The International Institute of Welding (IIW) have recently published a Guideline on weld quality in relation to fatigue strength [18] with the intention to provide quantitative and qualitative measures of geometric features and imperfections of welded joints to ensure that it meets the fatigue strength demands found in IIW [2] based on different assessment methods [2,19,20]. It also defines acceptance criteria based on weld geometry and imperfections which results in increased fatigue strength which are defined in S-N curves for different fatigue assessment methods.…”

Section: Iiw Guidelines On Weld Qualitymentioning

confidence: 99%

“…The welder or robot programmer has to follow the standard even though the fatigue life could be increased and the production cost reduced with optimized requirements. The most important geometrical parameters of the welds are the notch radius in the weld toe and depth of penetration in the root [18]. The discrepancy t plate thickness (mm) Fig.…”

Section: Design and Weld For Purposementioning

confidence: 99%

“…In the worst case, fulfillments of non-critical requirements are done on behalf of the critical characteristic [21]. Studies show a contradiction between large throat size and extensive weld penetration, meaning that it can be beneficial to specify and aim for a smaller throat size and receive a deeper penetration and by that an improved fatigue strength [18,19]. The welding standard has a high influence on the cost and a review which only states that the critical requirements of the weld can reduce the cost and increase the quality.…”

Section: Design and Weld For Purposementioning

confidence: 99%

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Quality control and assurance in fabrication of welded structures subjected to fatigue loading

et al. 2017

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The current paper presents a comprehensive overview of weld quality control and assurance of welded structures where the major failure prevention is due to fatigue loading. It gives the drawbacks and limitation of quality control systems, international weld quality standards, and guidelines used in today's weld production. Furthermore, in recent development in quality control and assurance of welded structures, a new online method is presented. The main target is to enable a complete, online evaluation of large quantities of welds in an accurate and repeatable fashion. Information gathered will not only be used for determining the weld quality level with respect to the fatigue strength but also to be evaluated for use in improved process control, in welding power sources, and robot control systems. It is verified that the new online method, a new laser scanning technology, and algorithms can successfully be used as modern tools for automated unbiased geometrical weld quality assurance and implemented in weld production environment.

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IIW Guidelines on Weld Quality in Relationship to Fatigue Strength

Cited by 45 publications

References 0 publications

Undercut tolerances in industry from a fracture mechanic perspective

Undercut tolerances in industry from a fracture mechanic perspective

A simple expression to estimate the fatigue endurance of welded joints

Quality control and assurance in fabrication of welded structures subjected to fatigue loading

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