Thermo-Mechanical Analysis of a Single-Pass Weld Overlay and Girth Welding in Lined Pipe

Obeid, Obeid; Alfano, Giulio; Bahai, H.

doi:10.1007/s11665-017-2821-5

Cited by 14 publications

(16 citation statements)

References 16 publications

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“…The thermal analysis is based on the transient thermal field induced on the material via the TIG welding arc, which is applied as a volumetric heat source having the front and rear ellipsoidal shapes proposed by Goldak et al [29]. This heat source model is established with a steep temperature gradient in front of the weld and the slow cooling rate at the rear section of the welding torch due to heat convection in the weld pool [30,31]. Figure 4 illustrates the Goldak’s heat source.…”

Section: Methodsmentioning

confidence: 99%

Finite Element Prediction of Residual Stress and Deformation Induced by Double-Pass TIG Welding of Al 2219 Plate

Ahmad

Gong

et al. 2019

Materials

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Finite element (FE) analysis of welding residual stress and deformation is one of the essential stages in the manufacturing process of mechanical structures and parts. It aids in reducing the production cost, minimizing errors, and optimizing the manufactured component. This paper presents a numerical prediction of residual stress and deformation induced by two-pass TIG welding of Al 2219 plates. The FE model was developed using ABAQUS and FORTRAN packages, Goldak’s heat source model was implemented by coding the nonuniform distributed flux (DFLUX) in user subroutine to represent the ellipsoidal moving weld torch, having front and rear power density distribution. Radiation and convection heat losses were taken into account. The mechanical boundary condition was applied to prevent the model from rotation and displacement in all directions while allowing material deformation. The FE model was experimentally validated and the compared results show good agreement with average variations of 18.8% and 17.4% in residual stresses and deformation, respectively.

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Section: Methodsmentioning

confidence: 99%

Finite Element Prediction of Residual Stress and Deformation Induced by Double-Pass TIG Welding of Al 2219 Plate

Ahmad

Gong

et al. 2019

Materials

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“…15(a) and (b), it can be clearly seen that the axial stress distributions around the welding direction have an almost homogenous distribution on the outer and inner surfaces. Consequently, the axial residual stress distributions do not strongly depend on the angular position [11].…”

Section: Temperature Field Induced By Girth Welding Without Liner (Camentioning

confidence: 95%

“…Accounting for the rotational movement of the welding torch along the circumference, the power density can be given as a function of position and time as follows [11]:…”

Section: Thermal Analysismentioning

confidence: 99%

“…Even so, it is worth noting that the technique used to move the heat source around the weld overlay to fix and seal the liner at the pipe ends and then around the girth weld to join two specimens of lined pipe has not been reported yet. Consequently, Obeid et al [11] presented a new procedure to simulate a typical lined pipe process including the weld overlay and girth welding. Furthermore, a sensitivity analysis to determine the influence of the cooling time between weld overlay and girth welding and of the welding speed has been conducted thermally and mechanically.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of thermal and residual stress fields induced by lined pipe welding

Obeid

Alfano

Bahai

et al. 2018

Thermal Science and Engineering Progress

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This paper investigates numerical thermal fields and residual stresses induced by single-pass weld overlay (lap-weld) and girth welding (butt-weld) in lined pipe using Tungsten Inert Gas (TIG) welding. A distributed power density of the moving heat source based on Goldak's ellipsoid heat flux distribution is used in a Finite Element (FE) simulation of the lined pipe welding process. In addition, radiation and convection have been incorporated in heat transfer coefficient user-subroutines for the FE code ABAQUS. The 3-D FE model approach has been validated using previous experimental results published for butt-welds of similar sections of carbon-manganese C-Mn steel pipe lined with stainless steel. The FE model has been developed to determine the thermal isotherms and residual stress distributions from weld overlay and girth welding. The use of an inner layer known as a liner has a considerable influence on the thermal history and residual stress distributions. Furthermore, the influence of the weld overlay has been examined thermally and mechanically as it is a key factor that can affect the quality of lined pipe welding.

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“…On the other hand, corrosive production fluids make the use of C-Mn steel pipe for flow line impossible, so that the need for corrosion mitigation is required [2]. One alternative is the use of a lined pipe, consisting of a thinner inner layer (the liner) and outer layer (backing steel) [3].…”

Section: Introductionmentioning

confidence: 99%

Mechanical response of a lined pipe under dynamic impact

Obeid

Alfano

Bahai

et al. 2018

Engineering Failure Analysis

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An experimental and numerical investigation on the mechanical response of a lined pipe (compound pipe) under a dynamic impact is presented. The influence of the impact energy has been studied in terms of the depth of the dent formed, and of the strains and residual stresses. To this end, a three-dimensional explicit dynamic non-linear finite element model has been developed and successfully validated against the results of impact-test experiments conducted on pipes made of AISI 10305 steel, with and without the AISI304 stainless steel liner. The validation was made by comparing numerically computed strains with those measured by strain gauges, as well as in terms of permanent deformation. The model is then utilized to evaluate the residual stresses, the amount of energy dissipation and the velocity of impact process as a function of different pipes (i.e. with or without liner) and of the free drop heights.

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Thermo-Mechanical Analysis of a Single-Pass Weld Overlay and Girth Welding in Lined Pipe

Cited by 14 publications

References 16 publications

Finite Element Prediction of Residual Stress and Deformation Induced by Double-Pass TIG Welding of Al 2219 Plate

Finite Element Prediction of Residual Stress and Deformation Induced by Double-Pass TIG Welding of Al 2219 Plate

Numerical simulation of thermal and residual stress fields induced by lined pipe welding

Mechanical response of a lined pipe under dynamic impact

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