Experimental validation of error in temperature measurements in thin walled ductile iron castings

Karl Martin Pedersen, Niels Skat Tiedje

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    Abstract

    An experimental analysis has been performed to validate the measurement error of cooling curves measured in thin walled ductile cast iron. Specially designed thermocouples with Ø0.2 mm thermocouple wire in Ø1.6 mm ceramic tube was used for the experiments. Temperatures were measured in plates with thicknesses between 2 and 4.3 mm. The thermocouples were accurately placed at the same distance from the surface of the casting for different plate thicknesses. It is shown that when measuring the temperature in plates with thickness between 2 and 4.3 mm the measured temperature will be parallel shifted to a level about 20C lower than the actual temperature in the casting. Factors affecting the measurement error (oxide layer on the thermocouple wire, penetration into the ceramic tube and variation in placement of thermocouple) are discussed. Finally, it is shown how useful cooling curve may be obtained in thin walled castings
    Original languageEnglish
    JournalInternational Journal of Cast Metals Research
    Volume20
    Issue number2
    Pages (from-to)84-89
    ISSN1364-0461
    DOIs
    Publication statusPublished - 2007

    Bibliographical note

    Publishers homepage: www.ingentaconnect.com/content/maney

    Keywords

    • Cast iron
    • Temperature measurement
    • Thin-walled castings
    • Thermocouple
    • White eutectic

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