TIG-dressing of High Strength Butt Welded Connections – Part 2: Physical Testing and Modelling

Es, S.H.J. van; Kolstein, M.H.; Pijpers, R.J.M.; Bijlaard, F.S.K.

doi:10.1016/j.proeng.2013.12.068

Cited by 18 publications

(10 citation statements)

References 6 publications

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“…Thickness correction method according to the IIW guidelines was applied, whereas no yield strength and stress ratio correction method were considered for TIG dressing in this study. Only weld toe failures were taken into account, with the exception of a study by van Es et al [10]. In their study, a few base material and weld material failures were observed for cast and rolled steels.…”

Section: Extracted Fatigue Datamentioning

confidence: 99%

“…Insufficient cleaning will result in reduced fatigue performance due the formation of gas pores. Additionally, other parameters affecting the fatigue strength due to the re-melting process include, for instance, travel speed, the welding current and the position of the torch as well as the shielding gas [10]. Typical conditions and the range of dressing parameters can be found in the International Institute of Welding's (IIW) recommendations for improving the fatigue strength of welded structures [4].…”

Section: Tungsten Inert Gas Dressingmentioning

confidence: 99%

“…On the other hand, thickness correction was applied as defined by the IIW recommendations [12]. It is worth mentioning that some studies have already reported the adjusted data for the thickness effect, such as studies by van Es et al [10] and Branco et al [20]. Therefore, no further thickness adjustments were made for already corrected test data.…”

Section: S-n Curve Slopesmentioning

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: Extracted Fatigue Datamentioning

confidence: 99%

Section: Tungsten Inert Gas Dressingmentioning

confidence: 99%

Section: S-n Curve Slopesmentioning

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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“…Where notches can be avoided in the design, e.g. by optimizing weld details by locating welds at a distance from stress concentration areas, or by appropriate applications of post-weld treatment, then V(HSS) can be utilized in a more favourable way [21], [25], [26]. This requires the choice of favourable detail categories and high manufacturing quality.…”

Section: Fracture Toughness 31 Eurocodementioning

confidence: 99%

Use of HSS and VHSS in steel structures in civil and offshore engineering

Es¹,

Slot²,

Steenbergen³

et al. 2018

Steel Construction

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The use of high-strength steels (HSS, 460 < f y ≤ 700 MPa) and particularly very high-strength steels (VHSS, f y > 700 MPa) is limited in steel structures in civil and offshore engineering. This is due to a lack of experience in structures made of these materials and a lack of understanding of the structural performance of HSS and VHSS. The main questions that are unanswered concern the topics of static strength, fracture toughness, fatigue, material (in) homogeneity and manufacturing. With regard to the static strength, it is unclear as to whether requirements currently stated in the Eurocodes for the yield-to-tensile strength ratio (f y /f u ) as well as the Von Mises yield criterion are applicable to structural designs in HSS and VHSS. With regard to fracture toughness, it is unclear as to whether the crack arrest capability of HSS and VHSS is currently sufficiently covered in Eurocode requirements. Furthermore, Eurocode requirements for maximum plate thickness are quite restrictive if they are extrapolated to HSS and VHSS. Other questions relate to the homogeneity of the material. Are HSS and VHSS sufficiently resistant to lamellar tearing and is material testing in different orientations necessary? This study gives an overview of the relevant questions, outlines the requirements in the current Eurocode system, presents answers to these questions where possible and provides a recommended research focus for the coming years.

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“…They act mainly on two aspects: 1) the geometrical variation of the weld bead and 2) the reduction of the stress concentration factors. Among these techniques, the TIG-dressing is probably the most used and consists in the re-melting of the weld toe by means of the TIG heat source (without filler metal) [2][3][4]. Such operation promotes a smoother transition between the plate and the weld crown and thus a reduction of the stress concentration factor as well as a residual stress redistribution.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of residual stress redistribution induced by TIG-dressing

Ferro¹,

Berto²,

Bonollo³

et al. 2018

Frattura Ed Integrità Strutturale

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TIG-dressing is a technique used to improve the fatigue strength of welded joints by a remelting of the weld toe region that promotes both a smoother transition between the plate and the weld crown and a residual stress redistribution. These effects are very hard to be quantified by numerical simulation since a highly coupled thermo-fluid-mechanical analysis is required. However, if the final weld toe geometry is supposed to be known or a-posteriori measured, a simplified numerical method can be used to simulate the residual stress redistribution that uses the activation-deactivation function of elements. This technique is applied to a real steel weldment and the results, in terms of phases proportions and residual stress redistribution, were found in good agreement both with data coming from metallurgical analysis and the improved fatigue strength observed on welded joints after the TIG-dressing operation.

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TIG-dressing of High Strength Butt Welded Connections – Part 2: Physical Testing and Modelling

Cited by 18 publications

References 6 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

Use of HSS and VHSS in steel structures in civil and offshore engineering

Numerical modelling of residual stress redistribution induced by TIG-dressing

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