Abstract:The purpose of this study is to investigate the evolution of residual stress during designing a 89-pass narrow gap welding of nuclear rotor pipes. A two-dimensional finite element model is employed to calculate the residual stress in welding process and heat treatment process, and then the evolution of residual stress during the welding process was discussed in detail. The investigated results show that the overall trend of hoop stress on the inner surface decreases gradually before pass 30, while the trend re… Show more
“…Narrow gap was used to multi-pass welding in order to decrease peak value and gradient of stress in the thick plate weld [42][43][44][45]. During multipass filling process, Figure 6 showed the hoop stress of narrow gap welding nuclear rotor pipes with thickness of 150 mm [46]. With the growth of the weld seam, the hoop stress was tensile stress in the weld area, and two zones with hoop compressive stresses occurred in the base metal areas adjacent to weld seam.…”
Section: Tep-fea For Multi-pass Weldingmentioning
confidence: 99%
“… Figure 5 Effect of plate thickness on residual stress along normal direction (ND): (a) residual stress distribution, (b) transverse stress through thick direction [41]. Figure 6 Hoop stress of narrow gap welding nuclear rotor pipes: (a) contour (MPa), (b) curves at weld centre line [46]. …”
Section: Predicting Welding Deformation and Residual Stress By Tep-feamentioning
confidence: 99%
“…Hoop stress of narrow gap welding nuclear rotor pipes: (a) contour (MPa), (b) curves at weld centre line [46]. …”
Section: Predicting Welding Deformation and Residual Stress By Tep-feamentioning
Welding deformation and residual stress have negative influence on assembly accuracy and service performance. Thermal elastic plastic (TEP) and inherent strain finite element analysis (FEA) methods were used to study this challenge. Basic principle of these two methods was first introduced. The influence of welding process, constraints, solid phase transformation and multi-pass welding on deformation and residual stress was discussed, and computation accuracy and efficiency were summarised. Loading method of inherent strain in inherent strain FEA was analysed, interface element was introduced to simulate effects of the gap on deformation in assembly welding especially for large structures. The future work, including accurately multiscale TEP model, efficiently transient prediction method of large structures, and flexible evaluation software, was planned.
“…Narrow gap was used to multi-pass welding in order to decrease peak value and gradient of stress in the thick plate weld [42][43][44][45]. During multipass filling process, Figure 6 showed the hoop stress of narrow gap welding nuclear rotor pipes with thickness of 150 mm [46]. With the growth of the weld seam, the hoop stress was tensile stress in the weld area, and two zones with hoop compressive stresses occurred in the base metal areas adjacent to weld seam.…”
Section: Tep-fea For Multi-pass Weldingmentioning
confidence: 99%
“… Figure 5 Effect of plate thickness on residual stress along normal direction (ND): (a) residual stress distribution, (b) transverse stress through thick direction [41]. Figure 6 Hoop stress of narrow gap welding nuclear rotor pipes: (a) contour (MPa), (b) curves at weld centre line [46]. …”
Section: Predicting Welding Deformation and Residual Stress By Tep-feamentioning
confidence: 99%
“…Hoop stress of narrow gap welding nuclear rotor pipes: (a) contour (MPa), (b) curves at weld centre line [46]. …”
Section: Predicting Welding Deformation and Residual Stress By Tep-feamentioning
Welding deformation and residual stress have negative influence on assembly accuracy and service performance. Thermal elastic plastic (TEP) and inherent strain finite element analysis (FEA) methods were used to study this challenge. Basic principle of these two methods was first introduced. The influence of welding process, constraints, solid phase transformation and multi-pass welding on deformation and residual stress was discussed, and computation accuracy and efficiency were summarised. Loading method of inherent strain in inherent strain FEA was analysed, interface element was introduced to simulate effects of the gap on deformation in assembly welding especially for large structures. The future work, including accurately multiscale TEP model, efficiently transient prediction method of large structures, and flexible evaluation software, was planned.
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