A framework to assess and repair pre-fatigued welded steel structures by TIG dressing

Manai, Asma

doi:10.1016/j.engfailanal.2020.104923

Cited by 6 publications

(5 citation statements)

References 21 publications

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“…Finally the third stage is distinguished by increasing plastic deformation to rupture state through the following values 41.86% of the raw metal specimen and of 25.56% for the specimen with automatic weld beads. The tensile test results and the stress-strain curve correspond with the industrial standards [1] and existing literature for pipeline steels, type API X52 [86][87][88].…”

Section: Tensile Test Of Different Specimenssupporting

confidence: 54%

“…The results are shown mainly based on the variation of defects geometry longitudinal (a/c) and depth (a/t). The ration a/c is parameter which can influence on the safety of transport network, while changing the crack along of the longitudinal of pipeline [85,86].…”

Section: Test Results and Analysis Experimental Methodsmentioning

confidence: 99%

“…Figure 6 However, the diminution of mechanical characteristics values change from 40% to 50% for the three forms which are compared with the base metalas shown in the Figure 7, Hence, the obtained results proved that the variation of the form length (c) leads to decrease the safety of piping systems on the one hand. On the other hand, in the Figure 8 the obtained results have provided that the repair by welding through the test specimens have become one of the most solutions which have a great efficiency on the keeping the mechanical properties by their comparing by defected specimens [84][85][86][87]. Consequently, the keep the mechanical characteristics of pipeline by weld repairing is consideredas challenge for many companies basing on the nature of piping systems and kind of transported liquids, for the first specimen when the ratio a/c =1.…”

Section: Tensile Test Of Specimen With Defect Through Ratio 0 mentioning

confidence: 94%

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Experimental study of the effects of semi-elliptical defects on the API X52 pipeline and its reparation by welding

MESSAOUDI

MERIEM-BENZIANE

2022

JMES

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The aim of the project is to study experimentally the influence of the semi-elliptical defect on the steel of grade API 5L X52 pipeline and its reparation by welding operation to keep the safety of hydrocarbons transport network. The tests have been performed on the specimens with/without semi-elliptical defects by using two ratios a/c and a/t, where the defects issue on the piping systems wall is treated by using the welding operation, which focuses on the filling the defected surface as same thickness of the base wall of the pipeline after removing the defects. The decrease of ultimate stress is mainly evident depending on the size of crack, where they compared to the base metal results. The experimental results showed that the reliability of the welding operation is proved especially in the ratio a/c =1, which is similar to that found in automatically welded. It is proved that the ratio a/t = 0.2 curve exhibits similarity to the base metal curve and their elongation conforms to API standard of steel X52 grade. Clearly, corrosion defects cause degradation of mechanical property in the order of 44% to 50% depending on the ratio of 0 < a/c ≤1 and from 20% to 80% according to the second ration of 0 < a/t ≤0.8. The obtained results proved that the enhanced of mechanical properties by welding reaches to ultimate stress is 559 MPa for the ratio a/t = 0.2 and 531 MPa for the ratio a/t = 0.5. Finally, the experimental results provided that the impact of semi-elliptical defect has effects on the safety of piping systems where welding became as one of among solutions to repair the piping systems.

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Section: Tensile Test Of Different Specimenssupporting

confidence: 54%

Section: Test Results and Analysis Experimental Methodsmentioning

confidence: 99%

Section: Tensile Test Of Specimen With Defect Through Ratio 0 mentioning

confidence: 94%

See 1 more Smart Citation

Experimental study of the effects of semi-elliptical defects on the API X52 pipeline and its reparation by welding

MESSAOUDI

MERIEM-BENZIANE

2022

JMES

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“…Other recommended post-welding treatment methods that increase the durability of these joints are peening, grinding and ultrasonic impact treatment [33,45].…”

Section: Methods Of Calculating and Evaluating The Fatigue Life Of We...mentioning

confidence: 99%

“…A more detailed overview of the methods for determining the expected life of steel welded joints can be found in [25,33].…”

Section: Methods Of Calculating and Evaluating The Fatigue Life Of We...mentioning

confidence: 99%

Strength analysis of welded joints in support structures of heavy machinery subjected to changeable loading conditions

Smolnicki,

Sokolski

2023

Eksploatacja i Niezawodność – Maintenance and Reliability

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The durability of bearing units of large machines depends mainly on the condition of their welded joints. With this in mind, we developed numerical models of the analyzed bearing units, for which we performed FEM simulations of the stresses in welded joints in several basic load cases. In each of the respective variants the technical condition of the bearing nodes was different and it corresponded to the severity of the degradation processes. Different positions of the superstructure in relation to the undercarriage were also taken into account. The simulations used the hot-spot method dedicated to FEM analyses of complex welded structures. We discovered that the loads have a significant influence on the values and distribution of von Mises principal stresses and their axial components. Based on the carried out analyses, we identified the most unfavorable load cases that generate the highest stresses in the welded joints of the assessed nodes. We also demonstrated that the applied method effectively assesses the stresses of welded joints subjected to variable working loads.

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An analysis of pre-fatigued TIG-treated welded structures

Manai

2021

Engineering Failure Analysis

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A framework to assess and repair pre-fatigued welded steel structures by TIG dressing

Cited by 6 publications

References 21 publications

Experimental study of the effects of semi-elliptical defects on the API X52 pipeline and its reparation by welding

Experimental study of the effects of semi-elliptical defects on the API X52 pipeline and its reparation by welding

Strength analysis of welded joints in support structures of heavy machinery subjected to changeable loading conditions

An analysis of pre-fatigued TIG-treated welded structures

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