Thermodynamic characteristics analysis of aluminium welding process

He, Kuanfang; Zhang, Z. J.; Tan, Zhi Long; Cheng, Yudong

doi:10.1179/1432891715z.0000000001375

Cited by 2 publications

(8 citation statements)

References 3 publications

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“…In numerical modeling of the welding, the Gaussian model of the welding arc is often accepted [9]. The Gauss heat flux distribution function is adopted to achieve moving heat loading in the calculation process, which is in Figure 1.…”

Section: The Moving Heat Sourcementioning

confidence: 99%

“…In order to validate the effectiveness of the proposed method, the real-time temperature curve of the weldment surface is measured by the infrared thermal imager in the welding experiment [9,19], which is shown in Figure 9. In order to validate the effectiveness of the proposed method, the real-time temperature curve of the weldment surface is measured by the infrared thermal imager in the welding experiment [9,21], which is shown in Figure 9.…”

Section: Simulation and Experimental Verificationmentioning

confidence: 99%

Section: Simulation and Experimental Verificationmentioning

confidence: 99%

“…The effective heating radius of the Gauss heat source is determined by an infrared thermal imaging temperature measurement experiment [9,19] …”

Section: Simulation and Experimental Verificationmentioning

confidence: 99%

“…Sheikhi [8] investigated the underlying mechanism involved in the solidification crack in pulsed laser welding of 2024 aluminum alloy experimentally and numerically. He [9] established a three-dimensional welding thermal-mechanical coupling model of aluminum alloy sheet, and analyzed the welding solidification crack tendency by calculation of the welding temperature, stress and the crack driving force curves. The current numerical techniques of welding mainly focus on the non-crack homogeneous or nonhomogeneous structure.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Analysis of Thermo-Elastic Fracture Problem during Aluminium Alloy MIG Welding Using the Extended Finite Element Method

Yang

Xiao

et al. 2017

Applied Sciences

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Abstract:The thermo-elastic fracture problem and equations are established for aluminium alloy Metal Inert Gas (MIG) welding, which include a moving heat source and a thermoelasticity equation with the initial and boundary conditions for a plate structure with a crack. The extended finite element method (XFEM) is implemented to solve the thermo-elastic fracture problem of a plate structure with a crack under the effect of a moving heat source. The combination of the experimental measurement and simulation of the welding temperature field is done to verify the model and solution method. The numerical cases of the thermomechanical parameters and stress intensity factors (SIFs) of the plate structure in the welding heating and cooling processes are investigated. The research results provide reference data and an approach for the analysis of the thermomechanical characteristics of the welding process.

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Section: The Moving Heat Sourcementioning

confidence: 99%

Section: Simulation and Experimental Verificationmentioning

confidence: 99%

Section: Simulation and Experimental Verificationmentioning

confidence: 99%

“…The effective heating radius of the Gauss heat source is determined by an infrared thermal imaging temperature measurement experiment [9,19] …”

Section: Simulation and Experimental Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Analysis of Thermo-Elastic Fracture Problem during Aluminium Alloy MIG Welding Using the Extended Finite Element Method

Yang

Xiao

et al. 2017

Applied Sciences

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Extended finite element method for analysis of the acoustic emission response by a crack under moving heat source

Liu

et al. 2018

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Purpose This paper aims to study acoustic emission (AE) propagation characteristics by a crack under a moving heat source, which mainly provides theoretical basis and method for the actual crack detection during welding process. Design/methodology/approach The paper studied the AE characteristics in welding using thermoelastic theory, which investigates the dynamical displacement field caused by a crack and the welding heating effect. In the calculation model, the crack initiation and extension are represented by moment tensor as the AE source, and the welding heat source is the Gauss heat flux distribution. The extended finite element method (XFEM) is implemented to calculate and solve the AE response of a thermoelastic plate with a crack during the welding heating effect. The wavelet transform is applied to the time–frequency analysis of the AE signals. Findings The paper provides insights about the changing rule of the acoustic radiation patterns influenced by the heating effect of the moving heat source and the AE signal characteristics in thermoelastic plate by different crack lengths and depths. It reveals that the time–frequency characteristics of the AE signals from the simulation are in good agreement with the theoretical ones. The energy ratio of the antisymmetric mode A0 to symmetric mode S0 is a valuable quantitative inductor to estimate the crack depth with a certain regularity. Research limitations/implications This paper mainly discusses the application of XFEM to calculate and analyze thermoelastic problems, and has presented few cases based on a specified configuration. Further work will focus on the calculation and analysis under different plate configurations and conditions, which is to obtain more interesting and general conclusions for guiding practice. Originality/value The paper is a successful application of XFEM to solve the problem of AE response of a crack in the dynamic welding inhomogeneous heating effect. The paper provides an effective way to obtain the AE signal characteristics in monitoring the welding crack.

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Thermodynamic characteristics analysis of aluminium welding process

Cited by 2 publications

References 3 publications

Analysis of Thermo-Elastic Fracture Problem during Aluminium Alloy MIG Welding Using the Extended Finite Element Method

Analysis of Thermo-Elastic Fracture Problem during Aluminium Alloy MIG Welding Using the Extended Finite Element Method

Extended finite element method for analysis of the acoustic emission response by a crack under moving heat source

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