The safe-end length effect on welding residual stresses in dissimilar metal welds of surge nozzles

Song, Tae Kwang; Oh, Chang Young; Kim, Ji Soo; Kim, Yun Jae; Lee, Kyung Soo; Park, Chi Yong

doi:10.1016/j.engfracmech.2011.03.007

Cited by 17 publications

(6 citation statements)

References 20 publications

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“…Such a load results in a bending moment that is tensile at the inner surface. A shorter safe‐end length can allow more axial tensile stresses at the inner surface due to its low self‐constraint 36 …”

Section: Finite Element Results For Through‐wall Residual Stresses Inmentioning

confidence: 99%

“…Mechanistic explanations for the effect of similar metal welding on residual stresses are given in Ref. [36], and can be summarized as follows. During similar metal welding, radial contraction due to similar metal welding produces a bending moment on the section at the DMW, which is compressive at the inner surface and tensile at the outer surface.…”

Section: Finite Element Results For Through‐wall Residual Stresses Inmentioning

confidence: 99%

“…Although the restraint condition can vary significantly depending on manufacturing and plant conditions, the un‐restrained boundary conditions during dissimilar and similar welding processes are believed to be close to the realistic conditions for most cases. The effect of kinematic boundary conditions on welding residual stress is discussed in our recent work 36 …”

Section: Finite Element Welding Simulationsmentioning

confidence: 99%

“…The effect of kinematic boundary conditions on welding residual stress is discussed in our recent work. 36 Figure 3 shows a typical FE mesh for the idealized nozzle with t SE = 40 mm. An axi-symmetric model based on the rotational symmetry condition was used.…”

Section: Welding Simulations For Dissimilar Metal Nozzle Butt Weldsmentioning

confidence: 99%

See 3 more Smart Citations

Through-wall welding residual stress profiles for dissimilar metal nozzle butt welds in pressurized water reactors

Song¹,

Kim²,

Oh³

et al. 2011

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

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A B S T R A C T This paper provides approximate expressions for through-wall welding residual stresses in dissimilar metal nozzle butt welds of pressurized water reactors. An idealized shape of nozzle is proposed, based on which systematic elastic-plastic thermo-mechanical finite element analyses are conducted by varying the thickness and radius of the nozzle and the length of the safe-end. Based on the results, a through-wall welding residual stress profile for dissimilar metal nozzle butt welds is proposed by modifying the existing welding residual stress profile for austenitic pipe butt welds in the R6 procedure.Keywords dissimilar metal nozzle butt welds; finite element analysis; pressurised water reactors; through-wall welding residual stress profile. N O M E N C L A T U R EA = area of weld bead, see Eq.(1) E = energy per unit length (J/mm), see Eq.(1) E = energy per unit length per unit thickness (J/mm 2 ), see Eq. (8) h = heat transfer coefficient (W/m 2 / • C), see Eq.(2) L = pipe length Q = energy rate per unit volume (W/mm 3 ), see Eq.(1) r, r i = mean and inner radius of the nozzle or the pipe, respectively, see Figs 2 and 4 T = temperature t SE , t P = thickness of the idealized nozzle and the pipe, respectively, see Figs 2 and 4 t = heating time x = radial coordinate from the bore of the nozzle or the pipe, see Figs 2 and 4 w SE = width of the safe-end measured at the outer surface (mm), see Fig. 2 η = welding efficiency, see Eqs (1) and (8) φ, θ , δ = non-dimensional coefficients in the R6 level 3 profile for austenitic pipe butt welds, see Eqs (5)-(7) φ M , θ M , δ M = non-dimensional coefficients of the proposed profile for dissimilar metal nozzle butt welds, see Eqs (11) and (12) σ a , σ h = axial and hoop residual stress, respectively σ 1.0p , σ 1.0w = 1.0% proof strength of the parent and weld material, respectively

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Section: Finite Element Results For Through‐wall Residual Stresses Inmentioning

confidence: 99%

Section: Finite Element Results For Through‐wall Residual Stresses Inmentioning

confidence: 99%

Section: Finite Element Welding Simulationsmentioning

confidence: 99%

Section: Welding Simulations For Dissimilar Metal Nozzle Butt Weldsmentioning

confidence: 99%

See 2 more Smart Citations

Through-wall welding residual stress profiles for dissimilar metal nozzle butt welds in pressurized water reactors

Song¹,

Kim²,

Oh³

et al. 2011

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

Self Cite

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“…In practical applications, the widely implemented method is that the overlays are cladded on the inner surfaces of the reactor pressure vessels and the components of nuclear safe end to constitute a protective barrier mitigating longterm erosion by the radioactive and corrosive media [5][6][7]. Nickel-base alloys are generally used as the overlay because of their excellent stress corrosion cracking (SCC) resistance [8,9].…”

Section: Introductionmentioning

confidence: 99%

A comparative study on microstructure and properties of Inconel 52M overlays deposited by laser beam and GTA cladding

Zhang

Huang

et al. 2015

Int J Adv Manuf Technol

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The current study investigates the overlays deposited by laser beam (LB) and gas tungsten arc (GTA) cladding with Inconel 52M filler wire in nuclear power plants. The effects of the deposition methods on the cross section profile, microstructures, and mechanical properties of both overlays are studied using optical microscope, scanning electron microscope (SEM), tensile and impact test and microhardness measurements. Experimental results show that LB cladding with higher wire feed rate improves the deposition efficiency as compared with GTA cladding. The microstructure of the LB clads consists of cellular and columnar dendrites, and Nbrich spherical particles are precipitated in the interdendritic regions, while the equiaxed dendrites are dominant in the GTA clads. The microhardness of the GTA clads is 20-30 HV higher than that of the LB clads. Furthermore, the tensile strength, toughness, and elongation of the LB clads decrease in comparison to the GTA clads. The deep penetration of the LB clads resulting in a wave shape of each pass and high dilution does not benefit the mechanical properties as compared with the GTA clads.

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The Segregation and Liquation Crackings in the HAZ of Multipass Laser-Welded Joints for Nuclear Power Plants

Zhu

et al. 2017

J. of Materi Eng and Perform

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The safe-end length effect on welding residual stresses in dissimilar metal welds of surge nozzles

Cited by 17 publications

References 20 publications

Through-wall welding residual stress profiles for dissimilar metal nozzle butt welds in pressurized water reactors

Through-wall welding residual stress profiles for dissimilar metal nozzle butt welds in pressurized water reactors

A comparative study on microstructure and properties of Inconel 52M overlays deposited by laser beam and GTA cladding

The Segregation and Liquation Crackings in the HAZ of Multipass Laser-Welded Joints for Nuclear Power Plants

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