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Numerical Simulation of Evolution in Molten Pool of the Electron Beam Welding Ofaluminium Alloy

Author: ShangXue
Tutor: HeJingShan
School: Harbin Institute of Technology
Course: Materials Engineering
Keywords: Electron beam welding Secondary development ANSYS Evolution bath
CLC: TG456.3
Type: Master's thesis
Year: 2011
Downloads: 142
Quote: 0
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Abstract


Affecting the flow of the bath electron beam welding process is an important factor , determines the temperature range of the fluid region , which will affect the flow of fluid applied to the electron beam energy of the workpiece , and thus also affect the flow temperature distribution . This paper by using Visual Basic software ANSYS secondary development to achieve , based on energy balance , mechanical balance and fluid flow balance, temperature field and flow field coupling calculation , the rational design of experiments to verify the simulation results are reasonable. In the model analysis, mainly taking into account the energy of the electron beam energy away metal evaporation and the actual energy applied to the workpiece between the three energy balance ; pool free surface by the surface pressure metal vapor recoil additional pressure caused by tension between the mechanical equilibrium ; puddle of liquid metal flow momentum conservation and mass conservation . In this paper, the heat source model based on the use ANSYS10.0 background batch characteristics can be achieved using Visual Basic6.0 secondary development , through the invocation of ANSYS to achieve parametric modeling , ANSYS platform through out the welding parameters to be modified and calls the ANSYS results file , the use of solid and liquid secondary development of programming on cable and accurate extraction of gas and liquid lines , improve the simulation accuracy. Through the simulation results on the temperature field can be seen in electron beam welding in the liquid metal pool highest temperature 3000K or more, and fast heating , and the highest temperature in the bottom of the keyhole , so that position of the metal caused by evaporation additional pressure maximum , when it reaches its equilibrium recoil pressure of about 104Pa. Simulation of the flow field can be derived , in the absence reaches a steady state , the maximum flow rate of the liquid bath bottom , generally 0.5m / s or so , when the quasi- steady state to be achieved , but the minimum flow rate of the bottom , at this point the bottom of the fluid velocity and the direction almost parallel to the welding direction , the fluid , there are some different regions of the metal vapor recoil pressure and surface tension caused by the additional pressure of the quasi equilibrium point , the liquid metal to the position under the force of flow , when electron beam hit these points will make it rapidly vaporized , to the surrounding injection may produce defects. In the experimental verification , the temperature field and the flow field can coincide with the experimental results .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > Special welding > Vacuum electron beam welding
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