Abstract
In situ high temperature measurements of plasma transferred arc welding (PTAW) deposition of overlays are required in order to optimize the process. Infrared (IR) cameras have the capability for making these measurements. The reliability of the quantitative data is often in question due to changes in emissivity with temperature, surface condition and phase change. Thus, the quantitative temperature values received from IR cameras are not reliable in these circumstances. In this study, several IR cameras were used to collect measurements on Ni–WC based metal matrix overlays deposited by PTAW. In addition, a methodology is developed to make quantitative measurements. It was found that only after the arc is extinguished can temperature values be collected in the region of interest. Arc reflectance and radiation negated obtaining any measurements from the surface of the deposit. The methodology developed applies the coupled use of differential scanning calorimetry, laser reflectance pyrometry, IR thermography and a correction algorithm. Using corrected emissivities, the effect of various process variables on the temperature of the PTAW deposit is reported.
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