Determination of residual stress evolution during repair welding of high-strength steel components

Amadeus, Becker; Schroepfer, Dirk; Kromm, Arne; Kannengießer, Thomas

doi:10.1016/j.finmec.2022.100073

Cited by 9 publications

(6 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The 200 mm long weld seam in the center of the sample was welded with the parameters from Table 2. Due to the slot specimen geometry, a restraint intensity transverse to the weld of R Fy = 11 kN/(mm mm) was realized to simulate the restraint conditions of real component welds [17]. The component used in the study was manufactured with parameters that are suitable for the application, cf.…”

Section: Methodsmentioning

confidence: 99%

“…In-situ digital image correlation (DIC) and ex-situ X-ray diffraction methods (XRD) enable correlations of the occurring stresses and strains of self-restrained specimens during and after welding and cooling, cf. [17][18][19][20]. These analyses were performed systematically during slot milling and revealed a significant interaction between stiffness and relaxation with the initial residual stresses induced by welding.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Residual Stress Evolution during Slot Milling for Repair Welding and Wire Arc Additive Manufacturing of High-Strength Steel Components

Wandtke,

Becker,

Schroepfer

et al. 2024

Metals

View full text Add to dashboard Cite

High-strength steels offer potential for weight optimization due to reduced wall thicknesses in modern constructions. Additive manufacturing processes such as Wire Arc Additive Manufacturing (WAAM) enable the resource-efficient production of structures. In the case of defects occurring in weld seams or WAAM components due to unstable process conditions, the economical solution is local gouging or machining and repair welding. It is important to understand the effects of machining steps on the multiaxial stress state in conjunction with the design-related shrinkage restraints. Research into how welding and slot milling of welds and WAAM structures affects residual stresses is still lacking. For this reason, component-related investigations with high-strength steels with yield strengths ≥790 MPa are carried out in our research. In-situ digital image correlation (DIC) and ex-situ X-ray diffraction (XRD) were used to analyze the stresses and strains induced on specimens during and after milling. The systematic analyses revealed a significant interaction of the stiffness and microstructure of the specimens with the initial residual stresses induced by welding. Subsequent repair welds can result in significantly higher residual stresses.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Residual Stress Evolution during Slot Milling for Repair Welding and Wire Arc Additive Manufacturing of High-Strength Steel Components

Wandtke,

Becker,

Schroepfer

et al. 2024

Metals

View full text Add to dashboard Cite

show abstract

“…Depending on these characteristics, which have directly relationship with specimen with defect of the depth (a), where the elongation value decreased from 40.86% to 1.98% led to degradation of piping systems. In addition, the Figure 10 obviously shows that the repairing by the welding process is considered a great challenge where these solutions have a valuable effect on the safety of piping systems through compared to results of the specimens with defects [21][22][23]. Basing on the increasing of the mechanical characteristics, the first form of ratio a/t = 0.2 the maximum value of ultimate stress is become 559 MPa and its elongation value 36.62%.…”

Section: Tensile Test Of Specimen With Defectfor Ratio 0 < A/t ≤ 08mentioning

confidence: 99%

“…Due to the occur of the complex chemical reactions, the corrosion issue in the piping systems influenced to loss of mineral represented by the brown layer and to decrease of the thickness in lifetime, where the pitting forms change and turn into semi-elliptical depth or length depending on the nature of materials and operating conditions [17][18][19]. These problems have become great obstacles on the piping systems including elbows [19][20][21], valves, and components of piping installations, where many studies were performed the impact of defects on the structures, which lead to change the mechanical characteristics, thus it must need to repair by welding [20][21][22][23] or by material composites [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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

MESSAOUDI

MERIEM-BENZIANE

2022

JMES

View full text Add to dashboard Cite

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.

show abstract

“…Получаемая продукция должна быть прочной и надежной, поэтому учет остаточных температурных деформации и напряжений является одной из важных задач инженеров-проектировщиков [1][2][3]. В основном решение температурных задач достигается с помощью математического моделирования [4][5][6][7][8][9][10], основанного исключительно на данных, полученных в ходе натурного эксперимента [11][12][13][14][15][16][17]. Поведение металлов при повышенных температурах следует учитывать в процессе моделирования [18][19].…”

Section: Introductionunclassified

The influence exerted by active cooling on the permanent connection formed as a result of electric arc welding

Ткачева

Abashkin

2022

PNRPU Mechanics Bulletin

View full text Add to dashboard Cite

The problem of temperature stresses is solved in the work. The process of electric arc welding with guaranteed penetration of steel plates of various thicknesses is simulated. The possibility of reducing residual stresses formed as a result of welding by applying heat removal from the surface of the near-weld region of a steel plate is being investigated. The temperature distribution is determined by solving a non-linear heat equation, in which the specific heat and thermal conductivity depend on temperature. The heat source is modeled using the double ellipsoid method proposed by John A. Goldak. The horseshoe-shaped heat sink follows immediately after the anode spot and is set by the heat flux in such a way that the main temperature of the plate does not decrease below its initial temperature. This limitation reduces the level of the temperature gradient, thereby reducing the stresses in the metal plate. To illustrate the effect of active heat sink, the temperature distribution in the top layer at the moment of termination of welding is compared with and without active heat sink. The material is assumed to be elastoviscoplastic, the deformations are small and consist of reversible and irreversible ones. Reversible deformations are related to stresses by the Duhamel - Neumann law. Irreversible strains increase when the von Mises plastic flow condition is satisfied, in which there is a plastic strain rate component responsible for the plastic flow viscosity. The elastic moduli (Young's modulus, Poisson's ratio) and the yield strength are assumed to be temperature dependent. The solution of the mechanical part of the problem is found by the method of simple iterations. For plates with different thicknesses, diagrams of residual stresses are given, located in the center of the plate from the seam to the periphery. As a result of the work, according to the obtained distributions of residual stresses in the plate material, it is concluded that the use of an active horseshoe-shaped heat sink from the near-weld zone when welding thin steel plates reduces residual stresses, therefore it is recommended to use in the welding process. The use of an active heat sink on the reverse side of the plate leads to an increase in the stress level, therefore it is not recommended for use.

show abstract

Determination of residual stress evolution during repair welding of high-strength steel components

Cited by 9 publications

References 12 publications

Residual Stress Evolution during Slot Milling for Repair Welding and Wire Arc Additive Manufacturing of High-Strength Steel Components

Residual Stress Evolution during Slot Milling for Repair Welding and Wire Arc Additive Manufacturing of High-Strength Steel Components

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

The influence exerted by active cooling on the permanent connection formed as a result of electric arc welding

Contact Info

Product

Resources

About