Abstract
An auxiliary attachment for the Hilger large quartz spectrograph has been described, with which it is possible to guide a sample under a stationary upper electrode while the photographic plate on which the spectrogram is recorded moves downward past the camera aperture of the spectrograph. The width of the spark crater caused by this form of excitation is 0.4 mm (0.016 in.). From the resultant spectrogram, it is possible to determine quantitatively the variations in concentration of the elements Mn, Si, Ni, Cr, Mo and V over the area of sample traversed. With certain modifications of the technique it is hoped later to include carbon in the above range of elements.An illustration is given of the application of the above technique to the determination of variations in composition across a weld area.It is considered that this technique will prove of valuable assistance to the metallurgist in the examination of: (a) Concentration variation within steel segregates. (b) Variation in composition across a weld area. (c) Inclusions in steel.
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