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Study on Temperature Field of Arc Deposition Manufacturing Using Infrared Thermography

Author: SunZuoFeng
Tutor: WangGuiLan
School: Huazhong University of Science and Technology
Course: Materials Processing Engineering
Keywords: arc deposition manufacturing auxiliary forming process thermal infraredimager temperature field of forming part thermal cycle curve
CLC: TG39
Type: Master's thesis
Year: 2013
Downloads: 11
Quote: 0
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Abstract


Arc deposition rapid manufacturing has advantages of low equipment investment、high productivity and low cost. However defects such as thermal distortion and residualstress are caused by high heat input and large heat affect zone by forming with process ofarc welding. The application of aiding processes such as hot rolling and electromagneticstirring during arc deposition manufacturing to improve organization and mechanicalproperties of forming part is proposed by our laboratory. The use of aided processes willchange the temperature field during deposition. The variation of temperature field duringmanufacturing which is one of affecting factors for property of forming part has alwaysbeen hot spot of domestic and international research organizations. In order to optimizeforming process and improve property of part, the experimental measurement andanalysis of temperature field during manufacturing are necessary.The emissivity was measured accurately by calibration experiment based ontemperature measure principle of thermal infrared imager in this paper. The temperaturefields of arc deposition rapid manufacturing with different process were also acquiredand analyzed by using infrared thermography. The thermal process and variation oftemperature field on the surface were studied; the impacts of aided forming process totemperature field and organization of part were analyzed as well.Temperature field of parts during manufacturing with different parameters weregathered by thermal infrared imager, the nephogram and gradient images of them weremade with acquired data. The influence of welding current and speed on the size ofcharacteristic temperature regions and temperature gradient. In addition, the feature ofthermal cycle curves on different place of part’s surface had been intensive studied, itscause of formation and change law were discussed, and its impact to organization andhardness was studied as well. The temperature field of part during forming with composite process of Hot Rollingand Arc deposition had been gathered by thermal infrared imager, and the optimumposition of roller was determined by analyzing the thermal cycle curve of deposited layer.The change of temperature and temperature field on surface of deposited layer wereanalyzed. The results show that, the roller has dash cold effect for the melt in rollingposition, which made the temperature gradient reduced. In addition, the thermaldistortion of part decreased after rolling.The acquisition and analysis to temperature field in electromagnetic aideddeposition manufacturing was made. The impacts of different exciting windings totemperature field on part’s surface were studied. The results show that, the formingefficiency had been increased when the forming quality was ensured if control heat inputof windings appropriately, at the same time, the temperature gradient on surface ofdeposited layer decreased, which was helpful for reducing the residual stress on it. TheX-ray stress measurement was used to compare the residual stress on parts forming withand without magnetic field. The result demonstrated the conclusion above.Scientific references were provided in this paper for optimizing process of arcdeposition rapid manufacturing in order to improve part’s property, reduce thermaldistortion and residual stress.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > High-energy forming
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