Numerical Simulation of Temperature Field and Stress Distribution in Inconel718 Ni Base Alloy Induced by Laser Cladding

The temperature field and stress distribution for in-service welding of a flowing media, pressurized pipeline are simulated by use of the finite element method (FEM). In order to investigate the effect of flowing media on the temperature field of in-service welding, the results are compared with those of a no-flow case. It is found that the flowing media took away most of the heat effects from welding. The cooling is accelerated and the peak temperature of the inner surface of the pipe is much lower than that of the no-flow case. An experiment was performed to verify the accuracy of the numerical model. The presence of internal pressure, i.e., flowing media, in the pipeline significantly affects the postcooling axial stress distribution.

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Temperature Field Numerical Simulation of Screwy Thin-Walled Part Cladded by Hollow Laser Beam

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.779-780.410 ◽

2013 ◽

Vol 779-780 ◽

pp. 410-413

Author(s):

Hao Lin ◽

Shi Hong Shi

Keyword(s):

Numerical Simulation ◽

Temperature Field ◽

Laser Beam ◽

Laser Cladding ◽

Molten Pool ◽

Laser Power ◽

Forming Process ◽

Single Laser ◽

Thin Walled ◽

Hollow Laser Beam

A numerical simulation model of laser cladding based on internal powder feeding through a hollow laser beam is set up by the Ansys Parametric Design Language (APDL). Through analyzing this model, the saddle-shaped distribution of energy absorbed in scanning direction is found and the molten pool temperature field of single laser cladding is observed like a comet[. Base on the single laser cladding experiments, the initial parameters and test plans of laser cladding and the screwy thin-walled part forming are confirmed. The finite element model of laser cladding forming screwy thin-walled part is established. The evolution of temperature field and thermal cycle of the nodes are studied during the screwy thin-walled part forming process. In the emulation laser power is controlled real time according to the analyses above, and the changing value of laser power is obtained to keep the molten pool temperature steady. The screwy thin-walled part is formed successfully based on these data.

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The Numerical Simulation on the Temperature Field of Laser Cladding

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.467-469.1372 ◽

2011 ◽

Vol 467-469 ◽

pp. 1372-1376

Author(s):

Li Yun Zheng ◽

Wen Zheng Xie ◽

Yu Ling Li

Keyword(s):

Numerical Simulation ◽

Temperature Field ◽

Simulation Model ◽

Laser Cladding ◽

Laser Scanning ◽

Scanning Speed ◽

Temperature Changes ◽

Finite Element Software ◽

Depth Direction ◽

Scanning Region

This article uses the finite element software ABAQUS in the process of laser cladding to form the numerical simulation, which establishes numerical simulation model of the temperature field of laser cladding forming the heat transfer. The results show that the laser scanning position of the cladding layer depth direction of a high temperature gradient. Simulation of temperature changes of a known point the temperature change in laser scanning region is drastic. The experimental results show that the numerical simulation model of the temperature field is reasonable. Therefore, the numerical simulation model can be used to analyze the influence of the laser cladding parameters on the temperature field and simulate remelting depth under any scanning speed.

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