Emissivity estimation for high temperature radiation pyrometry on Ti–6Al–4V

Hagqvist, Petter,1986-Högskolan Väst,Avd för automation och datateknik,PTW (author)

The paper demonstrates a versatile procedure suitable for industrial implementation of temperature measurement on a hot titanium alloy. The driving force has been the need for an accurate temperature measurement during additive manufacturing using laser welding technology where Ti–6Al–4V-wire is melted. The challenges consider both industrial constraints and the varying emissivity of the surface. Measurements makes use of a narrow bandwidth spot radiation pyrometer and a calibration procedure for estimation of the surface temperature through spectral emissivity estimation. The theoretical results are validated through experiments. A number of difficulties in radiation temperature measurements for metals with varying surface properties are discussed; especially the case of surface oxidation. The uncertainty in temperature reading due to the uncertainty in the emissivity estimate is established along with a model that qualitatively describes surface oxidation. The procedure is expected to be useful for several manufacturing applications where it is important to control high temperatures.

TEKNIK OCH TEKNOLOGIER Annan teknik Övrig annan teknik hsv//swe
ENGINEERING AND TECHNOLOGY Other Engineering and Technologies Other Engineering and Technologies not elsewhere specified hsv//eng
Ti-6Al-4V; Temperature; Emissivity; Radiation pyrometer; Laser metal deposition; Calibration
WIL
Work-integrated Learning
Physics
Fysik
Work Integrated Learning
Arbetsintegrerat lärande

Sikström, Fredrik,1971-Högskolan Väst,Avd för elektro- och automationsteknik,PTW(Swepub:hv)fsi (author)
Christiansson, Anna-Karin,1947-Högskolan Väst,Avd för elektro- och automationsteknik,PTW(Swepub:hv)takc (author)
Högskolan VästAvd för automation och datateknik (creator_code:org_t)

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Other Engineerin ...; and Other Engineerin ...

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