Simulation and analysis of temperature field for in-service multi-pass welding of a sleeve fillet weld

Wang, Ying; Wang, Lijun; Di, Xinjie; Shi, Y. W.; Bao, Xiuwei; Gao, Xiumin

doi:10.1016/j.commatsci.2012.10.025

Cited by 27 publications

(6 citation statements)

References 9 publications

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“…The reported works of literature [ 30 , 31 ] about sleeve repair welding mainly focused on the low-strength pipeline steel. Relatively few investigations on X80 pipeline repair based on experimental and numerical methods were reported.…”

Section: Resultsmentioning

confidence: 99%

Effects of Fillet Weld Size and Sleeve Material Strength on the Residual Stress Distribution and Structural Safety While Implementing the New Sleeve Repair Process

et al. 2021

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The process optimization and structural safety improvement of the in-service repair welding of the X80 pipeline are very important. In this paper, the temperature, microstructure, and stress distribution were analyzed using the combination of TMM (thermal-metallurgical-mechanical) simulations and the corresponding verification experiments. The effects of the sleeve material strength and the fillet weld size were discussed. The results showed that the fillet weld zone was mainly composed of ferrite and bainite when the material of the sleeve pipe was Q345B. Furthermore, the sleeve pipe’s HAZ (heat affected zone) was dominated by lath martensite, lath bainite, and granular bainite. Moreover, granular bainite and a small amount of ferrite were found in the HAZ of the X80 pipe. It was found that, as the fillet weld size increased, the welding residual stress distribution became more uniform. The hoop stress at weld toe reduced from ~860 MPa of case A to ~680 MPa of case E, and the axial stress at weld toe reduced from ~440 MPa of case A to ~380 MPa of case E. From the viewpoint of welding residual stress, fillet weld size was suggested to be larger than 1.4T. The stress concentration and the stress distribution showed a correlation with the cracking behavior. Weld re-solidification ripples on the weld surface and weld ripples between welding passes or near the weld toe could cause stress concentration and the corresponding crack initiation. Furthermore, when the material of the sleeve pipe changed from Q345B to X80, the high-level tensile stress zone was found to be enlarged. The hoop stress at weld toe increased from ~750 to ~800 MPa, and the axial stress at weld toe increased from ~500 to ~600 MPa. After implementing the new sleeve repair welding process where X80 replaces the material of sleeve pipe, the cracking risk in sleeve pipe will improve. From the perspective of the welding residual stress, it was concluded that the fillet weld size reduction and the sleeve material strength improvement are harmful to in-service welded structures’ safety and integrity.

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Section: Resultsmentioning

confidence: 99%

Effects of Fillet Weld Size and Sleeve Material Strength on the Residual Stress Distribution and Structural Safety While Implementing the New Sleeve Repair Process

et al. 2021

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“…The specific process involved heating the samples to the peak temperature of 800°C with the same heating rate of approximately to 100°C/s and holding at the peak temperature for 1.0 s and then cooling to 300°C with different cooling rates. Based on our previous work [13], the cooling time which is from the peak temperature 800-500°C (t 8/5 ) was controlled at 2.5, 4.0 and 5.5 s to compare the effect of heat input on the microstructure and mechanical properties of ICHAZ under inservice condition. A cooling time of 15 s was carried out to represent the normal welding condition for comparison.…”

Section: Methodsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Intercritical Heat-affected Zone of X80 Pipeline Steel in Simulated In-Service Welding

Cai

Xing

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

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The intercritical heat-affected zone (ICHAZ) of X80 pipeline steel was simulated by using the Gleeble-3500 thermal/mechanical simulator according to the thermal cycle of in-service welding. The microstructures of ICHAZ with different cooling rates were examined, and the hardness, the toughness and corresponding fractography were investigated. Results show that untransformed bainite and ferrite as well as retransformed fine bainite and martensite-austenite (M-A) constituents constitute the microstructure of ICHAZ. The two different morphologies of M-A constituents are stringer and block. Second phase particles which mainly composed of Ti, Nb, C, Fe and Cu coarsened in ICHAZ. Compared with normal welding condition, the toughness of ICHAZ is poor when the cooling time is short under in-service welding condition because of the large area fraction and size of M-A constituents that connect into chains and distribute at the grain boundaries. The Vickers hardness of ICHAZ that decreases with the increase in the cooling time is independent with the area fraction of M-A constituents.

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“…A number of finite element models based on the different FEA software for various welding processes have been developed to analyze temperature field and stress field of the weldment [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of laser welding for ITER correction coil case

Fang

Song

et al. 2015

Fusion Engineering and Design

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Simulation and analysis of temperature field for in-service multi-pass welding of a sleeve fillet weld

Cited by 27 publications

References 9 publications

Effects of Fillet Weld Size and Sleeve Material Strength on the Residual Stress Distribution and Structural Safety While Implementing the New Sleeve Repair Process

Effects of Fillet Weld Size and Sleeve Material Strength on the Residual Stress Distribution and Structural Safety While Implementing the New Sleeve Repair Process

Microstructure and Mechanical Properties of Intercritical Heat-affected Zone of X80 Pipeline Steel in Simulated In-Service Welding

Thermal analysis of laser welding for ITER correction coil case

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