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Temperature field observations during coaxial and side laser cladding

Haverkort, V. and Soer, L.J. (2008) Temperature field observations during coaxial and side laser cladding. Bachelor's Thesis, Physics.

Phys_Bc_2008_L.J._Soer__V._Haverkort.pdf - Published Version

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In the area of laser cladding, the Secondary Dendrite Arm Spacing is a very important measure for the material properties. A relation between the cooling rate at the solidification front and the SDAS exists. These cooling rates have never been observed in a direct way. In order to measure the cooling rate, a heat sensitive camera is used. Intensity fields are observed for Eutroloy 16012 and Micromelt 23 powders for side and coaxial cladding. The speeds of the laser tracks vary in the range from 0.5 mm/s to 15 mm/s. In making videos of the intensity field of the cladding process, very nice results are obtained. In these videos a lot of features are visible. The most prominent one is an unexpected decrease in intensity at what could be the edge of the meltpool. This gives rise to questions concerning the way calibration for the temperature should be done. Several theories have been established for this. The most credible one is that the decrease is caused by the carrier gas of the powder. This gas has a cooling effect on where it flows over the surface. Other parameters could also have an influence on the intensity images, and therefore on the calibration. A mathematical framework is developed in which the several dependences can be accounted for, if proper calibration for them is possible.

Item Type: Thesis (Bachelor's Thesis)
Degree programme: Physics
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 15 Feb 2018 07:45
Last Modified: 15 Feb 2018 07:45

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