TIG-dressing of High Strength Steel Butt Welded Connections – Part 1: Weld Toe Geometry and Local Hardness

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

doi:10.1016/j.proeng.2013.12.076

Cited by 28 publications

(7 citation statements)

References 1 publication

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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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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

View full text Add to dashboard Cite

show abstract

“…Again, Ferro et al [11] demonstrated through numerical simulation that in the medium and low cycle fatigue regime the residual stress field ahead the weld toe completely redistributed after the first fatigue cycle, while it remained unchanged in the HCF regime. Basing on those observations, HCF life enhance techniques were developed, such as shot-peening or TIG-dressing [12,13], that are thought to switch the residual stresses at the weld toe from tensile to compressive. Both the above-mentioned techniques and attempts to include the residual stress effects on fatigue prediction criteria, presuppose the knowledge of residual stress fields.…”

Section: Introductionmentioning

confidence: 99%

The influence of welding heat input on Residual Notch Stress Intensity Factor

Ferro

Tang

Berto

2022

International Journal of Fatigue

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“…Consequently, by ensuring an acceptable level of defects and similar residual stress conditions, two fatigue-related aspects still remain to be managed: (1) material and (2) notch effect. Such an effect is associated with the presence of bead reinforcements and, more specifically, with the shape of the region of transition between fusion and parent metal, known as the weld toe [14,15]. Depending on the severity of such effect, post-weld procedures like toe grinding or TIG dressing, among others, may be applied [15,16].…”

Section: Introductionmentioning

confidence: 99%

Analysis of fatigue-related aspects of FCAW and GMAW butt-welded joints in a structural steel

Silva

Souza

Lima

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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The classificatory method is considered a straightforward and robust procedure for the assessment of welded joints in metallic structures. The methodology adopts a set of S-N diagrams with a conservative survival rate, which expresses the fatigue performance of the most employed joint configurations. In the design phase, the adoption of a structural detail correlated with a higher curve in the set conducts to high structural integrity. Nevertheless, fatigue phenomenon is essentially multifactorial and, consequently, several optimizing alternatives may be applied for life increasing. Studies focused on continuous (weldless) parts correlate fatigue performance with the material ultimate strength. Transferring this approach to welded parts, adoption of a high-strength filler metal, or any procedure intended to mitigate metallurgical inhomogeneity in the weld-affected region may propitiate fatigue life improvement. In other sense, issues related to bead geometry, notably the notch effect associated with weld toe, are also reported to have an essential influence on fatigue life of structural details. This work aims to counterbalance material and bead geometry aspects related to fatigue performance of butt joints subjected to repeated transverse loading. Two welding processes, FCAW and GMAW, as well as different filler metals and parameters, were adopted for specimens manufacturing. The ASTM-A572-Gr.50 steel was employed as a parent metal. After welding, FCAW joints presented better mechanical and metallurgical characteristics. Additionally, in order to characterize the relevance of the notch effect, half of the specimens had the original bead geometry maintained, while the others underwent a manual removal of the reinforcement. The obtained results indicate that FCAW joints present better fatigue performance in the as-welded state. However, after removing the reinforcements, both welding processes attained similar results, suggesting that the notch effect has more relevance for fatigue life than mechanical and metallurgical characteristics of the joint. Consequently, the superior performance presented by the FCAW joints in the as-welded state is assigned to the final shape of the reinforcements, which is smoother than in the GMAW case. The higher capacity of penetration and better filler metal wettability propitiated by the FCAW process is responsible for the lower notch effect.

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TIG-dressing of High Strength Steel Butt Welded Connections – Part 1: Weld Toe Geometry and Local Hardness

Cited by 28 publications

References 1 publication

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

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

The influence of welding heat input on Residual Notch Stress Intensity Factor

Analysis of fatigue-related aspects of FCAW and GMAW butt-welded joints in a structural steel

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