Redistribution of welding residual stress following high plastic deformation in seamless pipes

Mirzaee-Sisan, Ali; Bastola, Ajit

doi:10.1016/j.ijpvp.2017.10.004

Cited by 12 publications

(5 citation statements)

References 4 publications

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“…39) Figures 10(a induced by Ag atom diffusions, which could be the main reason for the generation of larger residual stress. 42) The increasing residual stress decreases the ordered arrangement of fcc atoms and increases dislocations of the welded joint, as shown in Fig. 8(b).…”

Section: Effect Of Welding Temperaturementioning

confidence: 86%

“…48,49) Therefore, relatively large deformation of the welded joint induced by Ag atom diffusion introduces dislocation into the welded joint, which generates larger residual stress. 42) Figure 14(f) shows the average strain against tensile distance under different NW diameters. When the NW diameter is below the critical value, the shear strength of the welded joint decreases with the increase in NW diameter.…”

Section: Effect Of Nw Diametermentioning

confidence: 99%

See 1 more Smart Citation

Welding deformations of welded joints between 1D Ag nanowire connectors and 3D substrates: a molecular dynamics study

Luan

Zhao

Chen

et al. 2020

Jpn. J. Appl. Phys.

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In order to enrich the understanding of the relationship between 1D and 3D Ag nanomaterials in welding deformation, molecular dynamics simulations were performed to study a common structure of welded joints in Ag nanowire (NW) connectors on Ag substrates. The effects of the overlapping length, welding temperature and NW diameter on welding strength, dislocation and atomic strain were investigated, with the aim of understanding welding deformations of welded joints. With the increase in the overlapping length, welding temperature and NW diameter, the welding strength increases while the increment decreases. Dislocations can be reduced by increasing the overlapping lengths, NW diameters and annealing time. Moreover, the welded joint performance in shear strength could be improved by performing thermal annealing or decreasing NW diameters. The coordination number, residual stress and energy variation have also been analyzed to explain the above phenomenon. This work can provide guidance for the welding of nanomaterials with different dimensions.

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Section: Effect Of Welding Temperaturementioning

confidence: 86%

Section: Effect Of Nw Diametermentioning

confidence: 99%

Welding deformations of welded joints between 1D Ag nanowire connectors and 3D substrates: a molecular dynamics study

Luan

Zhao

Chen

et al. 2020

Jpn. J. Appl. Phys.

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“…10(b). 49) The length of dislocations decreases to 0 Å when the laser power is 200 ev ps −1 (from 76.8 Å the laser power is 0 ev ps −1 ), after which the length of dislocations increases dramatically to 294.6 Å when the laser power is 800 ev ps −1 . The disappearance of the dislocation suggests that the laser with proper power can dissipate the welded joint dislocation induced by the cold welding.…”

Section: Power Of Lasermentioning

confidence: 99%

“…The plastic deformation derived from the atomic movement in the welding process can introduce misfits and thereby influences the final distribution of residual stress. 49) Meanwhile, the atomic movement due to the local heating induced by laser welding might be relatively small compared with the uniform heating of the whole Ag NW leaded by the thermal annealing welding. As a result, the plastic deformation induced by laser welding causes the relatively small residual stress compared with the thermal annealing welding.…”

Section: Comparison Of Welding Effect Under Thermal Field and Lasermentioning

confidence: 99%

Atomic-scale structural evolution and welding deformations of laser welded joints in Ag nanowire connectors on homogeneous substrates

Luan

Shi

Chen

et al. 2020

Jpn. J. Appl. Phys.

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The formation mechanism and the influence of laser power on welding deformations of welded joints in Ag nanowire connectors were investigated using molecular dynamic simulations. Simulation results revealed that some regions of voids in the welded joint were filled due to the heat in the heat affected zone. The laser irradiation with the appropriate power can decrease dislocations and phase transitions generated by cold welding. The welding strength possessed an upward trend with the increase in laser power. With the increase of the laser power, the shear resistance of the welded joint improved. However, the welded joint after the laser with the excessive power weakened. Furthermore, by comparing the laser welding and the thermal annealing welding, we found that the laser welded joint possesses fewer amorphous atoms, phase transitions, dislocations, residual stress, and possibility of the shear deformation via simulation.

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“…In the tested cases, all coupons extracted from the welded segments (i.e., the dashed lines in Figure 6) are very similar to those corresponding to the coupons sampled from the corners of the cross sections. This result is trivially due to the welding procedure, which reduces ductility and increases strength as well as induces high residual stresses in the weld line [30,31]. In accordance with EN1993-1-1, the steel materials for structural applications should comply with the following limits:…”

Section: Ductility Of Cold-formed Steel In Hollow Profilesmentioning

confidence: 99%

Material Ductility and Buckling Behaviour of Eurocode‐compliant Cold‐formed Steel Hollow Columns

Landolfo¹

2022

ce papers

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Square and rectangular cold‐formed hollow sections are generally produced by either direct forming or indirect forming. These methods allow manufacturing nominally similar geometries of the cross‐sections, but leading to some different mechanical characteristics. The present paper addresses cold‐formed structural hollow sections produced by indirect forming that are characterized by the greater residual stresses, focusing on (i) the ductility of the cold‐formed material in the corners and flat parts of the section; (ii) the reliability of the buckling curves given by EN1993‐1‐1 for this type of columns. The reliability assessment is performed using first order reliability method on a detailed and validated numerical model developed in OpenSees. The results show that the current curve “c” in EN1993‐1‐1 underestimates the buckling capacity of stocky members.

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Redistribution of welding residual stress following high plastic deformation in seamless pipes

Cited by 12 publications

References 4 publications

Welding deformations of welded joints between 1D Ag nanowire connectors and 3D substrates: a molecular dynamics study

Welding deformations of welded joints between 1D Ag nanowire connectors and 3D substrates: a molecular dynamics study

Atomic-scale structural evolution and welding deformations of laser welded joints in Ag nanowire connectors on homogeneous substrates

Material Ductility and Buckling Behaviour of Eurocode‐compliant Cold‐formed Steel Hollow Columns

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