Combination of Grinding and Wet Welding to Repair Localized Cracking in T-Welded Connections

Méndez, Gerardo Terán; Cuamatzi-Meléndez, Rubén; Hernández, Apolinar Albiter

doi:10.4028/www.scientific.net/msf.793.51

Cited by 7 publications

(6 citation statements)

References 13 publications

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“…The experimental procedure previously developed by Terán et al [2,14], was adopted. This procedure involved fabricating the T-shaped connection using dry welding with A36 steel.…”

Section: Methodsmentioning

confidence: 99%

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Fatigue mechanical behavior of the repair techniques by grinding and wet welding

Terán,

Hernández,

Castro

et al. 2024

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This paper presents the results of a fatigue behavior study conducted on standard specimens obtained from a T-welded connection. The techniques of grinding and wet welding, commonly employed in the repair of offshore structures were utilized. The process involved a rectangular grinding in the weld area, followed by the application of wet welding to fill it. Two grinding depths, 6 and 10 mm, were investigated, and tests were performed at three immersion water depths: 50, 70, and 100 m. S-N curves were generated for air exposure conditions and the mentioned immersion depths. The results reveal a decrease in behavior in terms of stress and the number of cycles in the S-N curve as the immersion water depth increases. Particularly low-stress values were observed in connections with a 10 mm grinding depth at water depths of 50, 70, and 100 m. However, in the case of a 6 mm grinding depth and a 50-meter immersion depth, stress values were similar to those under air exposure conditions. This suggests that, in this specific configuration, the combination of grinding and wet welding could be effective in restoring the original service life of T-shaped connections. In contrast, in situations with a 6 mm grinding depth and immersion water depths of 70 and 100 m, significantly lower fatigue results were observed compared to air exposure conditions.

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“…The experimental procedure previously developed by Terán et al [2,14], was adopted. This procedure involved fabricating the T-shaped connection using dry welding with A36 steel.…”

Section: Methodsmentioning

confidence: 99%

“…G. Terán [2,14] reports results from the mechanical characterization of tension tests, hardness, and porosity for a T-joint using a combination of grinding and wet welding. However, one of the needs is to understand the fatigue behavior through the S-N curve when both techniques are combined in T-joint connections.…”

Section: Introductionmentioning

confidence: 99%

Fatigue mechanical behavior of the repair techniques by grinding and wet welding

Terán,

Hernández,

Castro

et al. 2024

Preprint

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“…specification (WPS) AWS D.1.1/D1.1M code [31]. In those references [29,30] all variables are presented using the T-welded connections fabrication. Figure 5a) shows an intact T-welded connection.…”

Section: Correlation Of Stress Concentration Factors For T-welded Conmentioning

confidence: 99%

Correlation of Stress Concentration Factors for T-Welded Connections – Finite Element Simulations and Fatigue Behavior

et al. 2017

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The stress concentration factors (SCFs) in welded connections usually occur at zones with high stress levels. Stress concentrations reduce the fatigue behavior of welded connections in offshore structures and cracking can develop. By using the grinding technique, cracking can be eliminated. Stress concentration factors are defined as a ratio of maximum stress at the intersection to nominal stress on the brace. Defining the stress concentration factor is an important stage in the fatigue behavior of welded connections. Several approaches have evolved for designing structures with the classical S-N approach for estimating total life. This work correlates to the stress concentration factors of T-welded connections and the fatigue behavior. Stress concentration factors were computed with the finite element employing 3D T-welded connections with intact and grinding depth conditions. Then, T-welded connections were constructed with A36 plate steel and welded with E6013 electrodes to obtain the stress-life (S-N) approach. The methodology from previous works was used to compute the SCF and fabricate the T-welded connections. The results indicated that the grinding process could restore the fatigue life of the T-welded connections for SCFs values in the range of 1.29. This value can be considered to be a low SCF value in T-welded connection. However, for higher SCF values, the fatigue life decreased, compromising and reducing the structural integrity of the T-welded connections.Nowadays, fatigue work on T-welded connections has been carried out, repaired by U-shape grinding under plane stress condition [7][8][9]. A better approach was achieved by performing 3D finite element modelling and applying empirical formulations [8,10]. Unfortunately, the empirical formulations can only be applied for a U-shape grinding depth of 27% of the plate thickness. For example, in the industry, deep cracks can be identified at

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“…Di Lorenzo et al [30] applied wet welding for A36 plates steel and E6013 electrodes to different meters of water columns (wcm) at 0 wcm, 20 It is well-recognized that energy absorption decreases as the water depth increases. During the wet welding process, different discontinuities can be present, such as, porosity, slag inclusion, non-metallic inclusion, or cracking.…”

Section: Cvn Datamentioning

confidence: 99%

“…Two different grinding depths of 6 mm and 10 mm, corresponding to 30% and 50% of the plate thickness, respectively, were carried out at the weld toe of the T-welded connections. Then, underwater wet welding was employed with three different water depths of 50 m, 70 m and 100 m. The wet welding method was done according to [18,20]. A hyperbaric chamber was employed to simulate the water depths, see Figure 1b.…”

Section: Wet Weldingmentioning

confidence: 99%

Fracture Toughness and Charpy CVN Data for A36 Steel with Wet Welding

et al. 2017

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This study presents K IC data obtained from K IC -CVN correlations from Charpy CVN values. For this study, T-welded connections were manufactured from ASTM A36 and E6013 electrodes in dry conditions. Then, a rectangular grinding at the weld toe was carried out and filled with wet welding. Charpy specimens were extracted to obtain CVN values. An exhaustive search through the literature of several authors was performed to collect experimental CVN data about wet welding being applied to A36 steel for comparison with CVN data obtained in this study. By using Charpy impact energy (CVN), K IC values could be predicted by K IC -CVN correlations. In addition, correlations were presented to obtain K IC values in the lower shelf, transition temperature zones and different zones for the energy-temperature curve of A36 steel. Of these correlations, Barsom's equation was adopted, because he applied the stress yield (σ YS ) of the material and it can be applied in all zones for the energy-temperature curve. The results revealed that CVN values are proportionate to K IC , this data decreases as water depth increases. This took place because several discontinuities, such as, porosity, slag inclusion, non-metallic inclusion, cracking and microstructures are present in the wet welding.

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Combination of Grinding and Wet Welding to Repair Localized Cracking in T-Welded Connections

Cited by 7 publications

References 13 publications

Fatigue mechanical behavior of the repair techniques by grinding and wet welding

Fatigue mechanical behavior of the repair techniques by grinding and wet welding

Correlation of Stress Concentration Factors for T-Welded Connections – Finite Element Simulations and Fatigue Behavior

Fracture Toughness and Charpy CVN Data for A36 Steel with Wet Welding

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